GB 7260.1 -200x  
 ICS 29.200  
K 85  
                                                         GB 
National Standards of the People’s Republic of China   
    GB 7260.1 —200×  
_______________________________________________________________  
 
 
Uninterruptible Power Systems (UPS) –– Part 1-1: 
General and Safety Requirements for UPS used in Operator Access Areas  
 
(IEC 62040 -1-1: 2002, MOD)  
 
(Draft for Approval)  
 
 
 
 
 
 
 
 
 
Issue date: 200× -××-××       Implementation Date: 200× -××-×× 
__________________________________________________________ __________  
 
Issued by the General Administration of Quality Supervision, 
Inspection and Quarantine of the People’s Republic of China  GB 7260.1 -200x  
 Contents  
Preface  I 
1 Scope and special application  1 
1.1 Scope  1 
1.2 Special application  1 
2 Normative references  2 
3 Definitions  3 
3.1 General rules  3 
3.2 Electrical parameters of UPS 4 
3.3 Load Types  4 
3.4 Power connections  5 
3.5 Circuits and circuit  characteristics  5 
3.6 Insulation  5 
3.7 Equipment mobility  5 
3.8 Insulation  class es for  UPS  5 
3.9 Enclosures  5 
3.10 Accessibility  5 
3.11 Components  5 
3.12 Power  distribution  5 
3.13 Flammability  5 
3.14 Miscellaneous  5 
3.15 Telecommunication network s 6 
4 General test conditions  6 
4.1 Working parameters when testing  6 
4.2 Test load  6 
4.3 Components  7 
4.4 Pow er interface  7 
4.5 Labelling and description  7 
5 Basic design requirements  13 
5.1 Prevention of electric shock and energy danger  13 
5.2 Insulation  15 
5.3 Current -limiting  circuit  15 
5.4 Measures of protecti ve grounding  15 
5.5 Separation of alternati ng current and direct current power  15 
5.6 Overcurrent protection and grounding malfunction protection  16 
5.7 Personal protection - Safety interlock device s 18 
5.8 Electrical gap, creepage distance and insulation penetration distance  20 GB 7260.1 -200x  
 5.9 External si gnal c ircuit  20 
5.10 Limited power  20 
6 Wiring, grounding and power supply  20 
6.1 Outline  20 
6.2 Power connection  20 
6.3 External power conductor wiring terminal  21 
7 Structural requirements  21 
7.1 Enclosures  21 
7.2 Stability  21 
7.3 Mechanical str ength  21 
7.4 Structural design details  22 
7.5 Fire prevention  22 
7.6 Placement of storage battery  22 
7.7 Exotherm  24 
8 Electrical requirements and simulated abnormal conditions  25 
8.1 Outline  25 
8.2 Dielectric strength  25 
8.3 Abnormal function and malfunction conditions  25 
9 Connection with communication network  27 
  
Appendix A (Specification Appendix) Heat resistance and fire prevention tests   
Appendix B (Specification Appendix) Electrical motor test under abnormal 
conditions   
Appendix C (Spec ification Appendix)  Transformers   
Appendix  D (Specification Appendix) Measurement instruments for current 
contact  tests  
Appendix E (Specification Appendix) Exotherm of coil   
Appendix F (Specification Appendix) Measurement methods for electrical gap and   
creepage distance   
Appendix G (Specification Appendix) Alternative method for confirming 
minimum  electrical gap   
Appendix J (Informative Appendix) Electrochemical potential table   
Appendix  K (Specification Appendix) Temperature control device   
Append ix H (Informative Appendix) Guidelines for preventing the entry of water 
and external foreign matters  29 
Appendix L (Specification Appendix) Backfeed protection test  31 
L.1 Outline  31 
L.2 Type A pluggable  UPS and Type B pluggable  UPS  31 GB 7260.1 -200x  
 L.3 Tests of p ermanently connected UPS  31 
L.4 Single malfunction conditions  31 
Appendix M (Specification Appendix) Examples of standard load conditions  33 
M.1 Outline  33 
M.2 Standard resistance load  33 
M.3 Standard sensibility -resistance load  33 
M.4 Standard capaci tivity  resistance load  34 
M.5 Standard non -linear load  34 
Appendix N (Specification Appendix) Ventilation of storage battery cabinet  37 
N.1 Outline  37 
N.2 Concentration of hydrogen  37 
N.3 Blocking situation  37 
N.4 Overcharging test  37 
Appendix X (Informative Appendix) Disconnection guide for storage battery 
during  transportation  40 
X.1 Applicable products  40 
X.2 Disconnection of storage battery  40 
X.3 Packaging tags / labels  40 
X.4 Damage inspection  40 
X.5 Importance of safety handling procedure s 40 
  
 
 GB 7260.1 -200x  
 Preface  
 
     GB 7260 “Uninterruptible power systems ( UPS )” is divided into several parts 
as follows:  
- Part 1 -1: General and safety requirements for UPS used in operator access 
areas;  
- Part 1 -2: General and safety requirements for UPS used in res tricted access 
locations;  
- Part 2: Electromagnetic compatibility (EMC) requirements;  
- Part 3: Method of specifying the performance and test requirements.  
This is Part 1 -1 of GB 7260. All technical content of this Part is mandatory.  
The amendment of this Part  adopts IEC 62040 -1-1: 2002 “Uninterruptible power 
systems (UPS) - Part 1 -1: General and safety requirements for UPS used in operator 
access areas.”  
Compared with IEC 62040 -1-1: 2002, this Part has the following technical 
differences:  
Subsection 4.5.15 of this Part is modified to “Unless otherwise specified, in the 
documents provided to the end user, the man-machine interface and  all labels should 
be all printed in standard Chinese.”  
 
In this Part, Appendices A, B, C, D, E, F, G, K, L, M and N are specifica tion 
appendices, while Appendices H, J and X are Informative Appendices.  
This Part was proposed by the  China Electrical Equipment Industrial Association.  
The Standardisation Administration of China/Technical Committee (SAC/TC 60) 
implemented this standard under centralised management.  
The units responsible for drafting this Part are Emerson Network Power Co., Ltd. and 
Forward Group.  
The units involving in the drafting of this Part were:  Delta -CIMIC Electronics Co., 
Ltd., Qingdao Rectifier Manufacturing Co.,  Ltd., Xian Power Electronics Research 
Institute, and QED Gomatech International Development Ltd.  
The main drafters of this Standard were: Qiu Jianqing, Wang Aosheng, Jiang Weishi, 
Zhang Xifan, Wei Hongqi, Sui Xueli, Wu Shengzhang, Shao Mingle, Zhou Guanyu n, 
Wang Ying and Wang Weihui.  
     
This is the first issue of this Part.  
 
IGB 7260.1 -200x  
1 Uninterruptible power systems (UPS) –– Part 1 -1: 
General and safety requirements for UPS used in operator 
access areas  
 
1   Scope and special application  
1.1   Scope  
     This Part  of GB 7260 applies to direct -current (DC) -based electronic 
uninterruptible power systems with energy storage devices. This Part adopts the 
related contents of GB 4943 -2001 and IEC 60950 -1: 2001.   
     The main function of uninterruptible power systems (UP S) included in this Part 
is to guarantee the continuity of alternating -current (AC) power output. UPS can also 
maintain power at specified characteristics , and hence enhance power quality. The 
annotations about regional difference indicated in the related chapters of GB 
4943 -2001 and IEC 60950 -1: 2001 also apply to this Part.  
     This Part applies to mobile, vertical, fixed or embedded UPS of low -voltage 
power distribution designed for installation in operator access areas. This Part 
specifies the requirem ents for ensuring the safety of operators and laymen who may 
have access to the equipment. Where particularly specified, it also applies to 
maintenance staff.  
     This Part aims at ensuring the safe installation, operation and maintenance of 
UPS devices i n accordance with the methods specified by the manufacturers. UPS 
means either single UPS units or internally interconnected UPS systems.  
     This Part does not include DC power -supplied electronic ballasts (IEC 60924 
and IEC 60925) or rotating -machine -based UPS.  
     With regards to the general and safety requirements of UPS for installation in 
areas of restricted access, please  refer to  GB 7260.4. Please refer to GB 7260.2 for the 
requirements for and definitions of electromagnetic compatibility (EMC).  
1.2   Special application  
     Although this Part does not include every type of UPS, it may still serve as a 
basic instructive document: for some UPS with special purposes, certain requirements 
may need to be added to this Part. Said special purposes are:  
     –– UPS devices designed to be exposed to the following: extreme temperatures, 
excessive powder and dust, humidity or vibration, flammable gases, 
corrosive or explosive atmosphere;  GB 7260.1 -200x  
2 ––UPS-equipped electronic medical device s situated within 1.5 meters of  the 
patient’s body;  
–– When over -voltage borne by the UPS when at transient state exceeds the 
over-voltage of Class II as specified in GB/T 16935.1, the UPS power 
supply part may require additional protective measures;  
–– Additional requirements are neede d for UPS devices that may have to be 
immersed in water or overrun by foreign matter. The guide rules for these 
requirements and related tests are indicated in Appendix H;  
–– UPS for long -time (exceeding 30 minutes) square wave output function ing 
should me et the fuzzy test requirements for voltage wave shapes as set out in 
Subsection 5.3.12 of GB/T 7260.3 to verify the compatibility of the load.  
     Note:   UPS for use in vehicles, vessels or flights or in tropical regions, or UPS for use in 
areas at over 1,000m above sea level may be subject to different requirements.  
 
2   Normative references  
 
The provisions of the following documents become provisions of this Part of GB 
7260  after being referenced. For dated reference documents, all later amendments 
(excluding corrigenda) and versions do not apply to this standard; however, any 
parties that come to an agreement under this standard are encouraged to consider 
adopting the latest versions of these documents. For undated reference documents, the 
latest versio ns apply to this standard:  
GB 4208  Degrees of protection provided by enclosure (IP code) (GB 4208 – 
1993, eqv. IEC 60529: 1989);  
GB 4943 -2001  Safety of information technology equipment (eqv. IEC 60950: 
1999);  
GB/T 5465.2  Graphical symbols for use on electr ical equipment (GB/T 5465.2 
– 1996, idt. IEC 60417: 1994);  
GB 6829 – 1995  General requirements for residual current operated protective 
devices (eqv. IEC 60755 and its amendment 1: 1986 and amendment 2: 1992);  
GB 7260.2  Uninterruptible power systems (UPS) Part 2: Electromagnetic 
compatibility (EMC) requirements (GB 7260.2 – 2003, IEC 62040 -2: 1999, 
MOD);  
GB/T 7260.3 Uninterruptible power systems (UPS) Part 3: Method of 
specifying the performance and test requirements (GB/T 7260.3 – 2003, IEC 
62040 -3: 1999, MOD);  GB 7260.1 -200x  
3 GB 7260.4  Uninterruptible power systems (UPS) Part 1 -2: General and safety 
requirements for UPS used in restricted access locations (GB 7260.4 – 200×, 
IEC 62040 -1-2: 2002, MOD);  
GB 16916.1 – 2003  Residual current operated circuit breakers without int egral 
overcurrent protection for household and similar uses (RCCB) Part 1: General 
rules (IEC 61008 -1: 1996, MOD);  
GB 16917.1 – 2003  Residual current operated circuit breakers with integral 
overcurrent protection for household and similar uses (RCBO) Part 1: General 
rules (IEC 61009 -1: 1996, MOD);  
GB/T 16935.1 – 1997  Insulation coordination for equipment within 
low-voltage systems Part 1: Principles, requirements and tests (idt. IEC 60664 -1: 
1992);  
GB/T 17045 – 2006  Protection  against electric shock – Commo n aspects for 
installation and equipment (IEC 61140: 2001, IDT);  
IEC 60950 -1: 2001  Information technology equipment – Safety Part 1: General 
requirements;  
IEC 61000 -2-2: 2002  Electromagnetic compatibility (EMC) Part 2 -2: 
Environment – Compatibility levels for low -frequency conducted disturbances 
and signalling in public low -voltage power supply systems.  
 
3   Definitions  
3.1 General rules  
This part adopts the following definitions. The related definitions of GB 4943 -2001 
and IEC 60950 -1: 2001 also apply to t his Part.  
Unless otherwise specified, the terms “voltage” and “current” used in this Part shall 
be the root mean square (R.M.S.) values.  
Note: When a non -sine wave signal exists, the measurement instrument to be used should be 
able to give real R.M.S. read ing. 
3.1.1  Uninterruptible  Power System (UPS)  
An Uninterruptible  Power System (UPS) comprises a converter, switch and energy 
storage device (e.g. storage battery) and is a power system that is able to maintain the 
continuity of loaded electric power when i nput power fails to function correctly.  
3.1.2  Bypass  
Internal or external power supply route replacing indirect UPS.  
3.1.3  Primary power  
Electric power provided by the generator of a public power supply system or user.  
 
 GB 7260.1 -200x  
4 3.1.4  Backfeed  
A part of the voltag e or energy inside UPS that directly connects or reversely feeds to 
any input terminal through the leakage route under the circumstances that the stored 
energy  mode  and primary power cannot be used.  
3.1.5  Backfeed protection  
A control measure for diminishi ng the risk of electric shock caused by backfeed.  
3.1.6  Stored energy mode  
UPS function under the following power supply circumstances:  
     –– the primary power is cut or exceeds the given tolerance;  
     –– the storage battery is discharging;  
     –– the load is within the given range;  
     –– the output voltage is within the given tolerance.  
3.2   Electrical parameters of UPS  
3.2.1  Rated voltage  
Input or output voltage  as specified  by the manufacturer  (3-phase power supply 
system refers to line voltage).  
3.2.2  Rated voltage  range  
Input or output voltage  range as specified by the manufacturer, and expressed by the 
lower limit value and upper limit value of rated voltage.  
3.2.3 Rated current  
     Maximum input or output current of UPS announced by the manuf acturer.  
3.3 Load types  
3.3.1 Normal load  
Try to adopt the mode closest to the strictest conditions of normal use  as specified in 
the manufacturer’s operation manual. However, when the actual application 
conditions are observably  stricter than the maximum load conditions recommended by 
the manufacturer, the maximum load available for application  should be used.  
     Note : Examples of the standard normal load conditions of UPS are shown in A ppendix  M. 
3.3.2 Linear load  
The load of current out of power descri bed by the following relational expression:  
I = U/Z  
     Where:  
     I –– loaded current;  
     U –– power voltage;  
     Z –– loaded impedance.  
 
 
 GB 7260.1 -200x  
5 3.3.3  Non-linear load  
The load with the parameter of loaded impedance ( Z) no longer being an invariable 
consta nt, but varying with such parameters as voltage , time or others (see A ppendix  
M). 
3.4 Power connections  
The definitions  set out in  Subsection 1.2.5 of GB 4943 -2001 and the following 
clauses are app ly. 
3.4.1  Power c ord 
Flexible cord or multiple -core lead s to be used for the purpose of interconnection.  
3.5 Circuits and circuit characteristics  
The definition in Subsection 1.2.8 of IEC 60950 -1: 2001 applies . 
3.5.1 Hazardous voltage  
The definition set out in Subsection 1.2.8.4 of GB 4943 -2001  applies . 
3.6 Insula tion 
The definition set out in Subsection 1.2.9 of GB 4943 -2001 applies . 
3.7 Equipment mobility  
The definition  set out  in Subsection 1.2.3 of GB 4943 -2001 applies . 
3.8 Insulation classes for UPS  
The definition set out in Subsection 1.2.4 of GB 4943 -2001  applies . 
3.9 Enclosures  
The definition  set out  in Subsection 1.2.6 of GB 4943 -2001 applies . 
3.10 Accessibility  
The definition set out in Subsection 1.2.7 of GB 4943 -2001 applies . 
3.11 Components  
The definition  set out  in Subsection 1.2.11 of IEC 60950 -1: 2001  applies.  
3.12 Power distribution  
The definition set out in Subsection 1.2.8 of GB 4943 -2001  applies . 
3.13 Flammability  
The definition set out in Subsection 1.2.12 of IEC 60950 -1: 2001 applies . 
3.14 Miscellaneous  
The definition set out in Subsection 1. 2.13 of GB 4943 -2001 and the following 
clauses apply . 
3.14.1 Type test  
The definition  set out  in Subsection 1.4.2 of GB 4943 -2001 and the following 
contents apply . 
Within the scope of this Part, if materials, parts and components are checked  for 
compliance  through inspection s / tests of product characteristics , these may  replace GB 7260.1 -200x  
6 the specified type test by any related inspection  data  or previous applicable test 
results . 
     Note :  For large -sized or high-power equipment, the appropriate test facilities may not be 
available for carry ing out certain type tests.  
3.15 Telecommunication networks  
The definitions  set out  in the following subsections  apply : Subsections 1.2.8.9, 
1.2.8.10, 12..8.11, 1.2.8.12 and 1.2.13.8 of GB 4943 -2001.  
 
4 General test conditions  
Subsections 1.4.1, 1.4.2, 1.4.3, 1.4.6, 1.4.7, 1.4.10, 1.4.11, 1.4.13 and 1.4.14 of GB 
4943 -2001, Subsection 1.4.8 and 1.4.12 of IEC 60950 -1: 2001, and the following 
clauses apply . 
Only current leakage and exotherm tests should be carried out within the toler ance of 
input voltage.  All other tests should be carried out under the nominal input voltage.  
4.1 Working parameters  when testing 
Testing should be carried out within the functioning area of the manufacturer when 
the following parameters are found to be i n the most critical  combinations , unless 
special test conditions  that would have an obvious significant influence on the test 
results are  specified in other clauses of this Part:  
     –– Power supply voltage;  
     –– No power at the  power supply voltage;  
     –– Power supply frequency;  
     –– Charging conditions of the storage battery;  
     –– Installation of the whole UPS  machine  and position ing of components  that 
may be dismantled ; 
     –– Function mode;  
     –– The temperature control device, adjustment  device or the adjustment of 
similar control in the operator access areas, including:  
a) no reliance on tool adjustment; or  
b) through adjustment by key or tool intentionally allocated for use  by the 
operator . 
4.2 Test load  
When it is confirmed that the in put current and other test results may be affected, the 
following factors should be considered and should be adjusted  so as  to produce the 
most critical  results:  
     –– The recharged load of  the storage battery;  
     –– The load of an optional object insi de the equipment under test (EUT) or 
attached to the equipment as proposed or indicated by the manufacturer;  GB 7260.1 -200x  
7      –– The load of other units scheduled to be allocated by the manufacturer and 
supplied with power by the EUT;  
     –– The load of equipment tha t can be connected to any standard power socket 
in the operator access area  that does not exceed the declared numerical value 
specified in Subsection 4.5.2.  
When  testing, a manual load can be used to simulate the above loads.  
4.3 Components  
Subsections 1.5 .1, 1.5.2, 1.5.4, 1.5.5, 1.5.6, 1.5.7 and 1.5.8 of IEC 60950 -1: 2001 
apply  
4.4 Power interface  
Subsections 1.6.1, 1.6.2 and 1.6.4 of GB 4943 -2001, and the following clauses apply.  
If the equipment has a neutral line, the neutral line should be the same as the phase 
line that it is isolated from the ground and the machine body. The rated working 
voltage of components that connec t the neutral line to the ground should be equal to 
the phase voltage.  When the output and input neutral lines are separated, the 
maintenance staff responsible for  their  installation should allocate the output neutral 
line according to the wiring code at the site and the detailed description provided by 
the installation manual.  
Check compliance through inspection.  
4.5 Labelling  and des cription  
4.5.1 Outline  
Labels or equivalent words  should be provided which  meet the following detailed 
requirements. With the exception of  equipment intended for installation  by the 
maintenance staff, labels stuck  in operator access areas or on the outer s urface of 
equipment should be obvious and can be easily seen.  If labels are fixed to the outer 
surface of  the equipment  they should  remain obvious and easily seen after being 
installed  according to the conditions for normal use.  
If the labels are outside t he equipment and cannot be seen but can  only  be directly 
seen after opening the door or shield ed by the equipment , this also meets the 
requirements.  If labels are placed behind door s or are shield ed and are not located in 
the operator access areas, additio nal indications  must  state where the labels should be 
shown on so as to be  easily seen (the adoption of temporary indication s is allowed).  
4.5.2 Rated value of power  
Sufficient labelling  requirements for equipments:  
     –– Input power requirements;  
     –– Rated value of output power.  
Equipment with multiple rated voltages should be indicated by the corresponding 
rated currents, which should be separated by slashes, “/” in the correct  order. The GB 7260.1 -200x  
8 corresponding relationships between the rated voltages and th e rated currents  should 
be clearly visible . 
For e quipment with  specified rated voltage range , the maximum rated current or 
current range  should be indicated . 
In addition to  the related content  set out  in GB 4943 – 2001, the input and output 
labels should a lso include:  
     –– Rated output voltage;  
     –– Rated output current or rated power (the unit is volt -ampere, VA) or active 
power (the unit is watt, W);  
–– If the rated output power factor is smaller than 1, the rated output power 
factor should be indic ated, or the active power and apparent power, or the 
active power and rated current should be indicated;  
–– Output phase number (1  or 3), with or without neutral line;  
–– Rated output active power, with its unit being watt (W) or kilowatt (kW) 
(see A ppendix M); 
–– Rated output apparent power, with its unit being volt -ampere (VA) or 
kilovolt -ampere) (kVA) (see A ppendix M); 
–– Maximu m temperature range of functioning environment (optional).  
Note : Check compliance according to A ppendix  M. 
For equipment designed with additional independent automatic bypass/maintenance 
bypass, additional AC power  input  or external storage battery, the ra ted value of the 
corresponding power can be specified in the random installation manual. In this case , 
at the connection p oint or the  surrounding area the  following description  should be 
indicated : 
Please read the installation manual carefully before conne ction with power.  
If the direct connection method  for primary power is not provided , it is not necessary 
for the rated current  to be indicated . 
4.5.3 Safety description  
Special items  must be provided in order  to avoid any danger from being caused when  
operating, install ing, maint aining , transport ing or stor ing the UPS. The manufacturer 
should provid e the necessary description  as regards  these items.  
     Note  1:   When  requiring special attention, e.g. the connection of the power -connected 
equipment to the storage battery, or the interconnection among st different 
independent units (if available). The protective UPS  connection , the storage 
battery box, and equipment terminals or output socket s with power supplied by 
UPS should remain interconnect ed even when the UPS power plug is cut off.  
Note  2:   Where  applicable, the description concerning  installation should refer to the 
national wiring code.  GB 7260.1 -200x  
9 Note  3:   Information  regarding maintenance  is usually provided for maintenance staff.  
An operation manual should be provided to users.  Users should  also  be provided with 
an installation manual  explaining the method for installing all pluggable equipment 
designed for installation by the user.  
The manufacturer should provide guidance to  the user according to the level of 
capability required for the installation of  equipment , such as:  
     –– Operator  can install : Type A or  Type B pluggable equipment with storage 
battery installed by the supplier;  
     –– Maintenance  staff can install: fixed equipment or equipment for wh ich the  
storage battery must  be installed on the spot.  
The manufacturer should provide guidance to  the user according to the level of 
capability required for the operation of equipment , such as : 
     –– Equipment to be operated by inexperienced staff;  
     –– Equipment to be operated by experienced staff.  
When the disconnection device to be us ed in isolation from the electric network is not 
installed in the equipment (see Subsection 3.4.2 of GB 4943 -2001) or when the power 
cord plug  serves as the disconnect ion device, it should be stated in the installation 
manual that:  
     ––For permanently connected UPS, an easy -to-operate, appropriate 
disconnection device should be installed on its fixed wiring;  
–– For pluggable UPS, the power output socket supplying pow er to UPS should 
be installed around the UPS for easier operation. When the UPS power wire 
has to be connected to the grounding power socket for safety reaso ns, it 
should be stated on the label or installation manual of UPS that all other 
equipment connect ed to the UPS or the special equipotential grounding 
connection of the Type  I equipment load should also meet this requirement.  
Note  4: in general, power wire fitted with plugs should not be over 2 meters long.  
For permanently connected UPS without built -in automatic backfeed isolation (see 
Subsection 5.1.4), it should be stated in the manual that the user is required to increase 
warning  tags on all primary power isolation devices that are  far from the  location of 
the UPS, providing a warning  to the electri c maintenance staff that this circuit 
supplies power to UPS.  
The warning tags should contain the following words or the equivalent sentences:  
Disconnect the UPS before working of f circuit.  
4.5.4 Adjustment of power voltage  
     See Subsection 1.7.4 of GB 4 943-2001.  
4.5.5 Power output socket  
     See Subsection 1.7.5 of GB 4943 -2001.  GB 7260.1 -200x  
10 4.5.6 Fuse  
See Subsection 1.7.6 of GB 4943 -2001.  
4.5.7 Wiring terminal  
See Subsection 1.7.7 of IEC 60950 -1: 2001.  
4.5.8 Wiring terminal of storage battery  
The wiring terminal due to be connected  to the  storage battery should be indicated 
with polarity according to GB/T 5465.2, or decrease the possibility of misconnection 
by its structure.  
4.5.9 Control device and indicator  
See Subsection 1.7.8 of GB 4943 -2001.  
4.5.10 Isolation of  multiple power supply  
See Subsection 1.7.9 of GB 4943 -2001.  
4.5.11 IT power distribution  
See Subsection 1.7.10 of GB 4943 -2001.  
4.5.12  Protection inside the building facilities  
If Type B pluggable equipment or permanently connected equipment relies on the  
protective device of building facilities to provide protection for the internal wiring of 
the equipment, t his should be stated in the form of a detailed description in the 
installation manual, and the requirements for short circuit or overcurrent protecti on 
should be provided . Where  necessary, the requirements for both situations should be 
given at the same time (see Subsection 5.6.1).  
If the UPS electric shock protection (see Subsection 5.1) relies on the residue current 
device of the building facilities,  and the circuit design of UPS makes the DC parts 
possibly have a malfunction ing current, then such a requirement should be stated in 
the installation manual:  the 3 -phase UPS of the residue current device of building 
facilities should be Type B (GB 6829), and the single -phase UPS should be Type A 
(GB 16916.1 or GB 16917.1).  
     Notes :  Pay attention to the protective requirements relating to the public power supply system  
in the national wire code (if available).  
4.5.13 Great leakage of current  
The followi ng contents and Subsection 5.1 of GB 4943 -2001 a pply. 
For UPS intended for use  as Type B pluggable equipment or for fixed UPS, if under 
any single mode, the total current leakage of UPS and all the connected load makes 
the current leakage on the preliminar y protective grounding conductor of UPS exceed 
or possibly exceed the limit ation  specified in Subsection 5.1 of GB 4943 -2001, then 
the UPS should  contain  a warning tag as specified in Subsection 5.1 of GB 4943 -2001.  
The connection method for primary power  should be specified  in the instruction 
manual . GB 7260.1 -200x  
11 4.5.14 Temperature control and other adjustment devices  
See Subsection 1.7.11 of GB 4943 -2001.  
4.5.15 Language  
Unless otherwise specified, the documents provided to end user, the man-machine 
interface and the labels should be all printed in standard Chinese.  
4.5.16 Durability of labels  
See Subsection 1.7.13 of GB 4943 -2001.  
4.5.17 Components  that can be dismantled  
See Subsection 1.7.14 of GB 4943 -2001.  
4.5.18  Replaceable storage battery  
See Subsection 1.7.15 o f GB 4943 -2001.  
4.5.19 Access by tools used by operator  
See Subsection 1.7.16 of GB 4943 -2001.  
4.5.20 Storage battery  
On the external storage battery box and the internal storage battery box of the UPS 
should be printed the following clear and decipherable  messages, the positions of 
which should be easily seen by maintenance staff when maintaining  the UPS, and 
which should meet the requirements of Subsection 1.7.1 of GB 4943 -2001:  
     a) Type of storage battery (lead -acid, nickel -cadmium) and number of nod es or 
number of units in a storage battery pack;  
b) Total nominal voltage of a storage battery pack;  
c) Total nominal capacity of a storage battery pack (optional);  
d) Warning tags should clearly display  the energy or the electric shock and 
chemical risk of the equipment. Refer to the requirements of protective 
handling and waste disposal specified in the following description.  
Exception: for internal storage battery pack s intended to be installed  on the upper part, 
lower part or by the side of  the UPS  devi ce, or for independent storage battery box es, 
or Type A pluggable UPS to be installed and connected with the socket by operators 
using the plug  - these need only be equipped with  warning tags stuck to the outside of 
the equipment (see item D above).  
All ot her messages should be provided  in the user manual.  
Description  
a) Internal storage battery  
–– Sufficient messages should be provided in the manual to ensure the 
appropriate change of the recommended model of storage battery;  
–– The installation / maintena nce manual should contain a description on 
the safe areas  permitted for  access by maintenance staff;  
–– If the storage battery is to be installed  by the maintenance staff, the GB 7260.1 -200x  
12 description on the interconnection of terminal torsion should be given.  
The oper ation manual should include the following descriptions:  
–– Maintenance of the storage battery should be carried out by a person 
with professional knowledge of storage batter ies or completed  under 
this person ’s supervision , and the related measures  should b e clear .  
–– When changing the storage battery, the same model number and 
quantity of storage batter ies should be replaced, or replaced by  storage 
battery bag.  
Warning: Do not allow the storage battery to come into contact with a 
flame or  fire, as it may e xplode.  
Warning: Do not open or damage the storage battery.  When released , 
electrolyte is harmful to  the eyes and skin, and may even poison 
those who it comes into contact with.   
b) External storage battery  
–– When no storage battery is allocated by  the UPS manufacturer, the 
installation manual should provide the voltage, rated value of 
ampere -hour (AH), method for charging, required protective methods 
during the installation of the storage battery, and the protective methods 
for the coordination work of U PS protective device;  
–– The storage battery manufacturer should provide  a description of 
storage battery unit.  
     c) External storage battery box  
If no cable is allocated by  the UPS manufacturer, sufficient descriptive 
requirements for installation and the size of  the cable connec ting the UPS 
should be printed on the external storage battery box allocated to the UPS.  
If the storage battery unit or pack is not installed and connected in advance, 
or if no detailed description is provided  by the UPS manufa cturer, the 
storage battery manufacturer should provide a description  on the 
installation of storage battery pack.  
4.5.21 Installation manual  
The i nstallation manual should provide sufficient information  relat ed to purposes and 
connection s such  as the sign al circuit, relay contact point and emergency 
disconnection circuit. When connected to other equipment, pay attention to protect  the 
TNV, SELV or ELV circuit s. 
The i nstallation manual should contain sufficient information (including the basic 
allocation of  the internal circuit of UPS) so as to highlight its compatibility with the 
power distribution.  
Particular attention should be paid to the compatibility with the related wire code and GB 7260.1 -200x  
13 bypass circuit.  
 
5 Basic design requirements  
5.1 Protection from electri c shock and energy danger  
Subsections 2.1.1.2, 2.1.1.4, 2.1.1.6 and 2.1.1.7 of GB 4943 -2001, Subsection 2.1.1.5 
of IEC 60950 -1: 2001 and the following clauses apply . 
5.1.1 Operator access  
This Part specifies two kinds of protective requirements for electri c shock caused by 
electrified components, and increases the protective requirements of energy risks  set 
out in  Subsection 2.1.1.5 of IEC 60950 -1: 2001.  
     Note  1: Regarding the definition of SELV circuit, please refer to Subsection 1.2.8.6 of GB 
4943 -2001. 
These requirements  are based on the following principles:  
     a) Permitted operator access  
–– Naked components in SELV circuit;  
–– Naked components in current -limiting circuit;  
–– Insulation of ELV circuit wiring under the conditions specified in 
Subse ction 2.1.1.3 of GB 4943 -2001.  
Note  2:  Attention should be paid to the AC 25V~50V and DC 60V~120V accessible 
naked electric -conducted components.  
b) Prohibited access by operator  
–– Naked components of ELV circuit or hazardous voltage circuit;  
–– The wor king insulation or basic insulation of components under 
conditions other than those specified in Subsection 5.1.2;  
–– The ungrounded electric -conducted components isolated from ELV or 
hazardous voltage components only by using working insulation or 
basic i nsulation.  
5.1.2 Access by ELV wiring  
     Subsection 2.1.1.3 of GB 4943 -2001 and  the following contents a pply.  
      Notes :  The maximum non -synchronic voltage or non -synchronic situation of inverter should 
be considered.  
Check compliance through inspecti on (test ing, if necessary).  
5.1.3 Discharge of main -circuit capacitor  
     Subsection 2.1.1.7 of GB 4943 -2001 and the following contents are applicable.  
Remarks:  It should be noted that for special allocation, the electric shock danger of electrified 
UPS not only comes from its internal capacitor, but also from the capacitor 
connecting with the load of UPS.  It should be considered when designing its 
installation.  GB 7260.1 -200x  
14 5.1.4 Backfeed protection  
Backfeed protection should be allocated. Under normal circumstances  and under the 
condition that the AC input voltage power failure causes single malfunction to the 
components (such as those in control circuit), there should be no d risk of electric 
shock (hazardous voltage, hazardous energy, hazardous contact current) at the input 
terminal of backfeed protective device.  
For fixed UPS, backfeed protection can be allocated inside the UPS or externally on 
its AC input wire.  
If the backfeed protective isolation device of UPS is installed externally, the supplier 
should provide  its suitable model number.  
Tags should be in place close to the input terminal (see Subsection 4.5.3).  
Check compliance through tests and inspections of equipment and related circuits, and 
by simulat ing the malfunction conditions indicated in Subsection 5 .3 of GB 
4943 -2001.  
If the backfeed protection applies  an air gap, the air gap should be equivalent to the 
following definition or effects:  
a)  In times of normal work, the distance among different phases should meet 
the basic insulation requirements (see Tables 2K and 2L of GB 4943 -2001);  
b)  If the equipment works in an inver ted way, the input source can be 
regarded as the secondary power without transient state over -voltage (see 
the last row of Table 2K of GB 4943 -2001).  For example, the basic 
insulation  of the current with the R.M.S. value of voltage being lower than 
150V is required to be 0.7mm, and the basic insulation of the current with 
the R.M.S. value of voltage being 150V~300V is required to be 1.4mm.  
For the UPS of electrical gap that is ground -free output, and all those with 
phase line open circuit and neutral line adopting basic insulation 
requirements, their compliance is acceptable.  If the output takes the engine 
frame as the ground, insulation must be strengthened or ma de equivalent to 
it; 
c)  If the quality guaranteed manufacturing  procedures  have at least the same 
level as the quality guarantee in example R.2 of GB 4943 -2001, and can 
afford the voltage specified in Table G.2 of GB 4943 -2001, then the 
electrical gap of the components may be further decreased. For example, 
for a voltage with its R.M.S. value not exceeding 300V, an air gap of 
0.4mm is considered  to be  acceptable.  
Check compliance through inspection s. 
5.1.5 Emergency switch device  
UPS should be necessarily allocated with a singl e emergency switch device (or a GB 7260.1 -200x  
15 terminal connected with the remote emergency switch device) to prevent UPS from 
continuously supplying power to the load under any mode.  If the additional 
disconnection device is attached to the electrical device of a buildi ng, it should be 
stated in the installation manual.  For pluggable UPS, if it is acceptable by the national 
wire code or the related circuit, these requirements are non -mandatory.  
Check compliance through inspection s. 
5.2   Insulation  
Subsections 2.2.3.1, 2 .2.3.2 and 2.2.3.3 of GB 4943 -2001 apply . 
5.3   Current -limiting  circuit  
Subsections 2.4.1, 2.4.2 and 2.4.3 of IEC 60950 -1: 2001 apply . 
5.4   Measures of protective grounding  
Subsections 2.6 of IEC 60950 -1: 2001 and the following clauses apply . 
5.4.1 Prot ective grounding  
When a single insulation fail s, a hazardous voltage may exist in the accessible 
electric -conducted parts of Type  I equipment. Hence  a reliable connection should be 
made with the protective grounding terminal inside the UPS.  
This requiremen t does not apply  to accessible electrically conducted  parts that are 
isolated from the hazardous voltage parts through the following methods:  
     –– Grounding metal parts; or  
     –– Solid insulation or air gap s that meet  the requirements of double insula tion 
or strengthened insulation, or a combination of both.  Under these 
circumstances, the fixing and strength of the involved parts should make the 
applied action force as required in the related tests in Subsections 2.10 and 
4.3.2 of IEC 60950 -1: 2001 maintain  at the smallest distance.  
Check compliance through the inspection of the related requirements in Subsection 
2.6.1 of IEC 60950 -1: 2001 and Subsection 5.3 of GB 4943 -2001.  
5.4.2 Connection  
The UPS of Type A pluggable Type  I equipment should be allocat ed with sufficient 
terminals, grounding sockets or other means , providing  other Type  I equipments in the 
final system allocation (including the external storage battery box) with potential 
connection to the  UPS, etc. Such connection is unrelated to whether  the one -time 
protective conductor of UPS is cut off from its power supply. A description o f any 
special connection s should be provided  in the user manual.  
Check compliance through inspecti ng the ground resistance test at the corresponding 
connecti ng area . 
5.5   Separation of alternating current (AC) and direct current  (DC)  power  
Subsection s 2.6.2, 2.6.3, 2.6.4 and 2.6.5 of IEC 60950 -1: 2001, and the following 
clauses apply . GB 7260.1 -200x  
16 5.5.1   Disconnection device  
Equipment should be allocated a disconnection device in order that  qualified staff can 
disconnect UPS from the AC power during  maintenance.  
     Note :  Unless there are requirements of application functions, isolation measures may be taken 
at both the maintenance access area, and outside the equipment.  
5.5.2 3-phase equipment  
For 3 -phase UPS, the disconnection device should simultaneously cut off all the phase 
lines from the power supply  source . For UPS with a power supplied by IT power 
distribution, the disconnection device should be quadruple , and can cut of f all the 
phase lines and neutral lines. If UPS is not allocated this type of quadruple  
disconnection device, concrete requirements that it should serve as part of the 
building facilities should be set out in the installation manual.  
If the disconnection d evice cuts off from the neutral line, it should simultaneously cut 
off all the phase lines (see Subsection 1.7.2 of GB 4943 -2001).  
5.5.3  Switch serving as a disconnection device  
If the disconnection device is installed at the switch inside the equipment, t he 
“Connect ” and “Disconnect ” positions should be indicat ed according to the 
requirements  set out in  Subsection 1.7.8 of GB 4943 -2001.  
5.5.4 Multiple powers  
If the power of permanently connected UPS is supplied by more than one source of 
external power (e. g. the power of different voltages/frequencies is used as the backup 
power), a clearly decipherable  label should be stuck to each disconnection device, and 
the detailed description on the disconnection from all external power should be  
provided . 
     Note :  Pay attention to the protective grounding conductor.  Even if a power cable is removed, 
protective grounding should be kept.   
5.5.5   Ungrounded conductor  
For those with both internal and external DC storage battery for supply ing power, the 
disconnection  device or isolation measure should disconnect all ungrounded 
conductors from connection s to the  storage battery or storage battery pack.  
Check compliance with Subsection 5.5 through inspection s. 
5.6 Overcurrent protection and grounding malfunction protect ion 
Subsections 2.7.3, 2.7.4, 2.7.5 and 2.7.6 of GB 4943 -2001, and the following clauses 
apply . 
5.6.1 Basic requirements  
The grounding malfunction protection  of the overcurrent, short circuit and input  and 
output circuits should be allocated. The protectiv e device is regarded as part of the 
equipment  as a whole , and also a part of the building facilities.  GB 7260.1 -200x  
17 a)  With the e xcept ion of  description b), the necessary protective devices 
meeting the requirements of Subsection 8.3 should serve as a part of the 
whole equipment;  
b)  Components in series connection with  the equipment input, such as the 
power cord, apparatus coupler , RFI filter, the short circuit and grounding 
malfunction protection of bypass and switch should be provided by the 
protective device of the building facilities;  
c)  If the building facilities  must be relied on  to provide protection, with the 
except ion of  Type A pluggable equipment, the installation manual should 
meet the terms set out in Subsection 4.5.12. The provision of such 
protection is ba sed on the rated value of socket and focusing on the 
inapplicable situation of Subsection 4.5.12;  
d)  The manufacturer should specify the R.M.S. value of  malfunction ing 
current s produced under the strictest conditions in order that  the neutral 
line, protec tive line and phase line of the permanently connected output 
circuit to select suitable dimension. If the manufacturer allocates the output 
circuit protection or the output of Type A pluggable equipment , the 
malfunction current  does not need to be provided . 
When current -limiting circuit independently controls the output current of the 
inverter , its short circuit or overload current should not produce the risks 
described in this Part.  Short circuit protection should function within 5 seconds.  
Notes :   The ab ove requirement is  in place  to decrease the risk of electric shock or fire in 
case of short circuit at an output terminal.  Allocating at the output terminal a 
disconnector with the same rated value of output circuit or the same limited current 
value also meets the standard  requirements.  
Check compliance through inspection s and function test s. 
5.6.2 Circuit protection of storage battery  
The power  supply circuit of storage battery should be allocated with the overcurrent 
protection that meets the requirements  of Subsections 5.6.3, 5.6.4 and Table 1.  
5.6.3   Position of protective device  
When the storage battery is installed inside the UPS, a protective  device should be 
allocated to the power supply circuit of the storage battery close to the connection to 
the storage battery, and before any element devices (such as capacitor, 
semi-conductive device or similar components) that may short -circuit malfunction.  
When the storage battery is installed outside the UPS, the position of overcurrent 
protective device is sh own as in Table 1.  
 
 GB 7260.1 -200x  
18 Table 1   Position of the protective device of storage battery  
Position and/or type of storage battery  Position of protective 
device  Quantity of 
overcurrent 
protective 
devices  Quantity of 
protective devices 
for grounding 
malfunction  
1) Inside UPS  UPS 1 1 or 2a 
2) Mobile or independent ly erected 
storage battery box  Storage battery box  1 1 or 2a 
3) Independent fixed storage battery box  Storage battery box  1 1 or 2a 
4) Independent storage battery chamber b Storage battery 
chamber  1 1 or 2a 
a  A protective device of grounding malfunction  must be located  on each pole of ungrounded 
storage battery, unless the fuse of external circuit has the same function.  
b  The rated values of the overcurrent protective device and cable allocated to UPS  should be 
indicated on the UPS operation manua l. If the storage battery box does not serve as the overall 
allocation of UPS, such requirement is also applicable to Item 2 and Item 3.  
For UPS with independent power supply from a storage battery, the rated  value of 
overcurrent protective device should be indicated in the operation manual.  The rated 
value of the current of conductor between UPS and the power -supply storage battery 
should be confirmed according to the requirements in Subsection 6.2.  
5.6.4 Ra ted value of protective device  
     The rated value of the built -in overcurrent protective device should exert 
protective function to the situation stated in Subsection 5.3.1 of GB 4943 -2001.  
     Check its compliance with Subsection 5.6 through inspection  and test.  
5.7 Personal protection  –– Safety interlock device s 
5.7.1 Operator Protection  
     In operator access areas, Subsection 2.8 of GB 4943 -2001 applies . 
5.7.2 Protection for maintenance staff  
Besides the requirements set out in Subsection 2.8 of GB 4943 -2001, the following 
clauses also apply  to the maintenance staff ’s adjustment and measurement of the 
upper part, lower part and surrounding places of the non -insulated electric part, or 
crossing over that part, or moving that part when the UPS is elect rified.  
5.7.2.1 Shield  
The shield and parts with hazardous voltage or energy level s should be appropriately 
placed, so as to decreas e the risk of electric shock or great current s caused by the 
removal or replacement  of the shield.  
5.7.2.2 Position and prot ection of parts  
Parts with hazardous voltage or energy level s and with  mobile components that may GB 7260.1 -200x  
19 cause personal harm should be fixed, isolated or  have  increased protective device s so 
as to decrease the adjustment,  restoration or similar action made by the  maintenance 
staff, or decrease the possibility of accidental access during the mechanical functional 
operation of electrified UPS (e.g. lubrication of electric machine, adjustment of the 
installation of the controller of dial with figures or the dial with out figures, restoration 
release device or manual operation switch).  
5.7.2.3 Parts on the door  
Parts with hazardous voltage or energy level s installed behind the door should be 
isolated or  have  increased protective device s so as to decrease the possibility  of 
accidental access of electrified parts by the maintenance staff.  
Check compliance with Subsections 5.7.1 and 5.7.2.3 through inspection s, tests and 
finger test s (Figure 2A of GB 4943 -2001).  
5.7.2.4 Access to components  
For the installation and fixing o f components in need of inspect ion, restor ation , 
adjust ment,  maintenance  or repa rations  when being electrified, during electrical 
maintenance other possibly accessible components and the grounding metallic parts 
should not cause  any electric shock s to the maintenance staff, any hazardous energy 
level s or any danger caused by great current s, and the mobility of the adjacent 
components shall not cause personal harm. Other components or leads should not 
obstruct the access of a certain component . 
 When the ele ctrified UPS is adjusted by screwdriver  or similar tool, the necessary 
protection according to the requirements set out in  Subsection 2.8.3 of GB 4943 -2001 
should be provided, so as to prevent any risk of electric shock or hazardous energy 
level s caused by  accidental access to the adjacent uninsulated hazardous electrified 
parts.  Danger caused by the non -aiming of tools should also be considered .  
Protection can be made in the following ways:  
     –– Adjust the position of device to be far from the uninsula ted hazardous 
electrified parts; or  
     –– Use a protective device  to decreas e the possibility of access by tools  to 
uninsulated electrified parts.  
Check compliance through inspection s, and through malfunction simulation 
inspection, if necessary.  
5.7.2.5 Mobile components  
Fix or protect the mobile components that  may cause personal harm during  the 
maintenance process, so that they cannot  be accidentally accessed.  
5.7.2.6 Capacitors  
The capacitors should be discharged to protect the maintenance staff. If th e discharge 
time exceeds 1.0 second,  this should be indicated by a warning tag, reducing the GB 7260.1 -200x  
20 danger to the required time of safety level (not exceeding 5 minutes) as defined in 
Subsections 1.2.8.4 and 1.2.8.7 of GB 4943 -2001.  
5.7.2.7 Internal storage batte ry 
The placement of  an internal storage battery should minimize the risk of electric 
shock caused by accidental access to the  wired terminal. The interconnection should 
minimize short circuit s and the risk of electric shock during  maintenance or 
replacemen t.   
Check compliance with Subsections 5.7.2.4 to 5.7.2.7 through inspection s. 
5.8 Electrical gap,  creepage distance and insulation penetration distance  
     Refer to Subsection 2.10 of IEC 60950 -1: 2001.  
5.9 External signal c ircuit   
     Subsections 2.3 and 2.5 of GB 4943 -2001 apply . 
5.10 Limited power  
     Subsection 2.5 of GB 4943 -2001 appli es. 
 
6 Wiring, grounding and power supply  
6.1 Outline  
Subsection 3.1 of GB 4943 -2001 applies.  
6.2 Power connection  
Subsections 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3 .2.7 and 3.2.8 of GB 4943 -2001, 
Subsection 3.2.5.2 of IEC 60950 -1: 2001, and the following clauses apply . 
6.2.1 Connection Methods  
In order for a  safe and reliable connection with the primary power  to exist , UPS 
should contain one of the following connecti on devices:  
     –– Wiring terminal permanently connecting with power;  
 –– Power cord that cannot be dismantled permanently connect ed with power or 
connect ed with power by plug;  
     –– Apparatus plug connecting with power cord  that can be dismantled . 
If the equipment has more than one kind of power connection (e.g. the power of 
different voltages/frequencies, or that served as backup power), the design 
should meet all the following conditions:  
     –– Provide different circuits with independent connection ways;  
 –– If the wrong insertion of power -plug connection devices may cause  any  
danger, they should not be able to be interchanged ; 
–– When one or multiple connectors are cut off, the operator should refrain 
from  accessing any naked parts with ELV or hazar dous voltage (e.g. plug).  
     Check compliance through inspection.  
 GB 7260.1 -200x  
21 6.3 Wir ing terminal of external power conductor  
 Subsections 3.3.1 to 3.3.8 of GB 4943 -2001 a pply.  
  
7   Structural requirements  
Subsection 4.1 of GB 4943 -2001 and the following contents  apply.  
7.1   Enclosures  
In the scheduled functioning, the engine stand or engine frame of equipment should 
not be used to carry the current.  
     Notes : the grounding engine stand or engine frame  may  carry leaked current or current in case 
of electrical m alfunction.  
The part of the numerical dial or nameplate serving as a functional part of enclosures 
should meet the requirements of enclosures.  
If different modules of modulari sed units  are to be assembled  on the spot (these 
modules can be in open structure  - without enclosure or partly with enclosure), the 
modules of modulari sed units should meet the requirements set out in  Subsection 2.1 
of IEC 60950 -1: 2001. The labels of modules and electrical bonding between modules 
should meet the requirements set out in Chapter 3 of IEC 60950 -1: 2001.  
Enclosures should protect each part of the modulari sed units.  The composing parts of 
enclosures should meet the related requirements for the protection of the danger of 
fire, electric shock, personal harm and hazardous en ergy level.  
Check compliance through inspection.  
7.2   Stability  
Subsect ion 4.1 of GB 4943 -2001 and the following contents  apply.  
The stability of units and equipment structure should not bring any danger to 
operator s and maintenance staff under normal working conditions .   
If the use of a certain reliable stability device can improve the stability of the opening 
of drawer parts or doors, the stability device should function automatically when used 
by the operator. If it is not automatic, appropriate and br ight labels should be stuck in 
place as a warn ing to maintenance staff.  
Check compliance by carrying out  the following related tests. Each test should be 
carried out independently. In the tests, the boxes and cabinets of equipment should be 
placed with the  objects producing undesirable  conditions within the rated volume 
range. If caster wheels are used during the normal function of equipment, the caster 
wheels should be placed at  an undesirable  position.  
Whether  with or without a storage battery, when the e quipment is under the strictest 
situation as described in GB 4943 -2001, the equipment should not tumble.  
7.3   Mechanical strength  
Subsection 4.2 of GB 4943 -2001 and Subsection 4.2.7 of IEC 60950 -1: 2001 appl y. GB 7260.1 -200x  
22 7.4   Structural design details  
Subsection 4 .3 of GB 4943 -2001, Subsection 4.3.13 of IEC 60950 -1: 2001, and the 
following contents  apply.  
7.4.1   Opening  
The size of the anti -fire enclosure or the top of electrical protective enclosure, the 
right top opening of the naked part with hazardous voltage in any direction should not 
exceed 5mm, unless the equipment adopts labyrinth structure or similar limited 
structure (see Figure 4B of GB 4943 -2001) to prevent the vertically entered foreign 
matter from accessing the naked part.  This requirement is inappl icable to the top 
opening of equipment enclosure at a height exceeding 1.8m.  
7.4.2   Concentration of gas  
If the equipment contains a storage battery under normal application conditions, s 
sufficient safety measures should be in place so as to avoid the r isk of explosive gas 
accumulation and internal or external leakage.  
      Note :  Also see Subsection 7.6.  
Check compliance through inspection.  
7.4.3   Mobility of equipment  
For equipmen t with caster wheels for  aiding  mobility to the installation position, 
when rigid fixed wiring  is due to be carried out , additional measures should be taken 
to ensure immobility during  installation. For units with a mass of greater than or equal 
to 25kg, the action force of 20% of its weight (but not exceeding 250N) should be 
applied t o test whether it is moveable.  
Check compliance through inspection s and tests.  
7.5   Fire prevention  
Subsection 4.7 of GB 4943 -2001 and Subsections 4.7.2 and 4.7.3 of IEC 60950 -1: 
2001 a pply.  
The fire retardant  grade of the storage battery should  be at least Grade HB (see 
Appendix  A). 
7.6   Placement of storage battery  
Storage batter ies for use in UPS  are required to have  an independent and enclosed 
installation position. This can be designed as:  
     –– An independent storage battery chamber or s torage battery room;  
     –– An indoor or outdoor independent storage battery box or storage battery 
cabinet;  
     –– A storage battery tank or storage battery cell built inside the UPS.  
When  install ing the storage battery the following requirements  should  be taken into 
consideration . 
Check compliance according to Subsections 7.6.1 to 7.6.8  where applicable . GB 7260.1 -200x  
23  
7.6.1 Accessibility and protectiveness  
The electrode and the connector of  the storage battery should be eas ily access ible so 
as for using a suitable t ool for tightening. When  install ing storage batter ies with 
electrolyte the cap of the storage battery unit to be accessed easily so as for testing the 
electrolyte and readjusting its liquid level.  
Check compliance through inspection s and by using the tool or test equipment 
allocated or recommended by the storage battery manufacturer.  
7.6.2 Vibration  
Prevent vibration according to the manual of storage battery manufacturer.  
Check compliance through inspection.  
7.6.3  Distance  
If the enclosure of the storage b attery unit is composed of insulated materials or 
covered by an insulated shield, when the ventilation and the temperature of storage 
battery meet the requirements, no gap can be left between storage battery.  
Check  compliance through inspection s. 
7.6.4 Ins ulation  
The insulation between the nickel -cadmium storage battery units and 
electric -conducted enclosures as well as between th ose and the storage battery box or 
cabinet should meet the requirements  set out in  Subsection 5.2.  
Check compliance through inspe ction s. 
7.6.5 Wiring  
According to the requirements  set out in  Chapter 6, protective measures must  be taken 
as regards  the contact point, connection and wiring so as to prevent them from being 
affected by environmental temperature, humidity, gas, steam and mechanical stress.  
Check compliance through inspection s. 
7.6.6  Leakage of electrolyte  
Sufficient protection is required  in case of electrolyte leakage of  the storage battery, 
such as the anti -electrolyte coating for the storage battery tray and box.  
     Note: this requirement  does not apply  to VRLA type storage battery.  
Check compliance through inspection.  
7.6.7 Ventilation  
Good ventilation should be provided, making the potential explosive oxy -hydrogen 
compound inside spread safe and below a hazardous lev el. 
Appendix N provides  the calculation method for achieving the required airflow  for 
guaranteeing that the storage battery cabinet (independent or assembled) reaches a 
sufficient dilution level.  
For equipment assembled with storage battery and electrical components, explosion s GB 7260.1 -200x  
24 caused by the accumulation of hydrogen or oxygen partially occurr ing to the adjacent 
areas of arc starting parts  should be avoided  (such as the air vent of storage battery / 
contactor and switch by the side of valve).  
Fully enclosed  components or isolated storage battery cabinet s can be adopted, or the 
technical structure making UPS and storage battery completely ventilated can be 
adopted to solve this problem.  
Technical data about  the EUT structure  should be provided by the manufact urer to 
prove that the distance between the air vent/valve of storage battery and any opened 
arc starting components is sufficient.  
If the UPS is equipped with a storage battery, the installation manual should provide 
appropriate information about the requ ired airflow  of the storage battery chamber.  
Check compliance through inspection s, calculation s and measurement s. If 
non-enclosed components are used, a distance of 500mm between the arc starting 
parts and the air vent/valve of storage battery is regarded as meeting the requirements.  
7.6.8 Charging voltage  
If any  single malfunction occurs , prevent the over-voltage of the storage battery  (e.g. 
turn off the charger or cut off the charging current in case of malfunction . The 
manufacturer should clearly indicat e the limited charging voltage value.  
Check compliance through circuit evaluation and performance test.  
7.7   Exotherm  
     Subsection 4.5.1 of GB 4943 -2001 and the following contents are applicable.  
Table 2   Exotherm limit  
Parts  Maximum Exotherm (oC) 
Insulation (including coil)  
Grade A material 105  
Grade E material 120  
Grade B material 130  
Grade F material 155  
Grade H material 180  
Grade C material 200  
Grade N material 220  
Grade P material 240   
75 
90 
95 
115 
140 
150 
165 
185 
 
Table 3   Allowed coil temper ature limit when the stored energy mode ends  
Insulation grade  
oC Temperature measured by 
average resistance 
measurement method  
oC Temperature measured by 
thermocouple 
measurement method  
oC GB 7260.1 -200x  
25 105 127 117 
120 142 132 
130 152 142 
155 171 161 
180 195 185 
200 209 199 
220 216 206 
240 234 224 
 
8   Electrical requirements and simulated abnormal conditions  
8.1   Outline  
Subsection 5.1.1 of GB 4943 -2001 and the following  contents apply.  
8.1.1   Current leakage on the ground  
Under any modes of circuit layout, during the summing of the current leakage on the 
ground of the UPS and of its connected load carried by the protective grounding 
conductor of UPS, the UPS should meet the requirements  set out in  Subsection 5.1.2 
of GB 4943 -2001.  
=When the current leakage o n the ground exceeds 3.5mA, Subsection 5.1.7 of GB 
4943 -2001 is applicable.  
Check compliance through inspection s and related tests.  
8.1.2   Type B pluggable UPS  
Type B pluggable UPS should be equipped  with a permanently fixed  power cord that 
meets the requ irements  set out in Subsection 3.2.5 of IEC 60950 -1: 2001.  
Check compliance through inspection.  
8.2   Dielectric strength  
Subsection 5.2 of GB 4943 -2001  applies.  
8.3   Abnormal function and malfunction conditions  
Subsections 5.3.1, 5.3.2, 5.3.3, 5.3.4, 5. 3.5 and 5.3.8 of GB 4943 -2001, and the 
following contents  apply.  
8.3.1   Malfunction simulation  
Check the compliance of the components and circuits other than those specified in 
Subsections 5.3.2, 5.3.3 and 5.3.5 of GB 4943 -2001 through the simulation of t he 
following conditions:  
     –– Malfunction of any components in the main circuit;  
 –– Malfunction of any components with un desirable  effects on additional 
insulation and strengthened insulation in times of their failure;  
–– Besides, the malfunction of al l the related components for equipment  that 
does not meet the requirements set out in  Subsections 4.4.2 and 4.4.3 of GB GB 7260.1 -200x  
26 4943 -2001,  
–– Malfunction caused after connecting the strictest loaded impedance to the 
connection terminal and connector, which are al located to the equipment  power 
supply and signal output.  
If multiple outputs have the same internal circuit, it is only required to test one of the 
outputs.  
For the main -circuit components (e.g. power cord, apparatus coupler, RFI filter, 
bypass, switch and  their interconnected leads) connect ed to the power input and 
output, if they meet  the requirements of  Item a) in Subsection 5.3.6 of GB 4943 -2001, 
malfunction simulation is not required.  
     Note s:  In the examples of the short circuit and open circuit o f the triode, diode and 
capacitor (especially the electrolytic  capacitor), the malfunction of continuous 
energy consumption caused by the electrical resistor which is designed to be 
intermittent energy consumption, and the internal malfunction of integrate d circuit 
producing excessive power consumption.  
Testing should be carried out  when the  equipment is  functioning  under the rated 
voltage or at the upper limit of the rated voltage range. Simulate one malfunction 
condition one time.  
Tests may be carried out  on the circuits inside the equipment or the simulated circuits, 
outside the equipment, independent components or accessories . 
With the exception of  the compliance criterion specified in Subsection 5.3.3 of GB 
4943 -2001, the temperature of transformer s supplying power to the components 
during testing should not exceed the requirement s specified in Appendix C, and the 
detailed descriptions relating to exceptions in this Appendix should also be 
considered.  
8.3.2   Test conditions  
When equipment is  functioning  under the rated voltage or at the upper limit of the 
rated voltage range, tests  should be carried out  under any conditions of expected 
normal application and faulty operation.  
     Note s: examples of normal application or faulty operation:  
–– Any operatio n of the accessible operation devices not following the instructions of the 
manufacturer, such as handle, hand lever, key and baffle;  
–– The air vents that may be simultaneously covered or sequentially covered (such as located at 
one side or at the top of the equipment);  
–– Operation under any output overload conditions (including short circuit).  
Moreover , if a protective shield is attached to the equipment, the protective shield 
should be placed  as normal . The test starts from the normal idling to the entr y of a 
stable state.  GB 7260.1 -200x  
27  
9   Connection with communication network  
Chapter 6 of GB 4943 -2001 and the following contents are applicable:  
Subsections 1.4.11, 2.1.1, 2.1.1.1, 2.1.1.2, 2.1.3, 2.3, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 
2.6.1, 2.9.5, 2.10.4, 3.5, 3.5. 1 and 3.5.2 of GB 4943 -2001, Appendix M and 
Subsections 1.4.8, 2.6.5.8, 2.10.3.3 and 2.10.3.4 of IEC 60950 -1: 2001.  GB 7260.1 -200x  
28 Appendi ces 
 
Appendix A (Standardised Appendix) Heat resistance and fire prevention tests  
See Appendix A of GB 4943 -2001.  
 
Appendix B (Stan dardised Appendix) Electrical motor test under abnormal conditions  
See Appendix B of GB 4943 -2001  
 
Appendix C (Standardised Appendix) Transformer  
See Appendix C of GB 4943 -2001.  
 
Appendix D (Standardised Appendix) Measurement instruments for current cont act 
tests  
See Appendix D of GB 4943 -2001.  
 
Appendix E (Standardised Appendix) Exotherm of coil  
See Appendix E of GB 4943 -2001.  
 
Appendix  F (Standardised Appendix) Measurement methods of electrical gap and  
creepage distance  
See Appendix F of GB 4943 -2001 . 
 
Appendix G (Standardised Appendix) Alternative method for confirming minimum  
electrical gap  
See Appendix G of GB 4943 -2001.  
 
Appendix J (Informative Appendix) Electrochemical potential table  
See Appendix J of GB 4943 -2001.  
 
Appendix K (Standardised Ap pendix) Temperature control device  
See Appendix K of GB 4943 -2001.  GB 7260.1 -200x  
29 Appendix H  
 
(Informative Appendix)  
Guide rules for preventing the entry of water and external foreign matters  
 
When it is possible for water or external foreign matters to enter the sched uled 
application site, applicable protective grade should be selected from GB 4208.  This 
Appendix is extracted from GB 4208.  
Protective -grade components that  ensure  that  the prevention of water and foreign 
matters meet the requirements should not be able to be dismantled without the aid of 
tools.  
The content of Tables H.1 and H.2 are extracted from GB 4208. For test conditions 
and compliance, please refer to GB 4208.  
Table H.1   Protective grade of the prevention of the entry of external foreign 
matters re presented by the first -place feature figure  
Protective grade  The 
first-place 
feature figure  Brief description  Implication  
0 Without protection.  ––  
1 Prevent the solid foreign matter with 
diameter of no less than 50mm.  Spherical test tool with diameter  of 50mm 
cannot completely enter the enclosure a. 
2 Prevent the solid foreign matter with 
diameter of no less than 12.5mm.  Spherical test tool with diameter of 12.5mm 
cannot completely enter the enclosure a. 
3 Prevent the solid foreign matter with 
diamet er of no less than 2.5mm.  Spherical test tool with diameter of 2.5mm 
cannot completely enter the enclosure a. 
4 Prevent the solid foreign matter with 
diameter of no less than 1.0mm.  Spherical test tool with diameter of 1.0mm 
cannot completely enter the en closure a. 
5 Anti-dust The entry of dust cannot be completely 
prevented, but the dust volume entered does 
not affect the normal functioning of 
equipment, and neither the safety.  
6 Dust tight  No entry of dust.  
a   The diameter part of test tool cannot en ter the opening of enclosure.  
 
 
 
 
 GB 7260.1 -200x  
30 Table H.2 Protective grade of water prevention represented by the second -place 
feature figure  
Protective grade  The 
second -place 
feature figure  Brief description  Implication  
0 Without protection.  ––  
1 Prevent vertica l dripping.  Dripping in  a vertical direction should bring no 
harmful effect.  
2 Prevent vertical dripping 
when the enclosure inclines 
within the range of 15o. When each vertical side of enclosure inclines within 
the range of 15o, vertical dripping should b ring no 
harmful effect.  
3 Prevent water sprinkling.  Water sprink led in each vertical side within  a range 
of 60o should bring no harmful effect.  
4 Prevent water splashing.  Water splash ed on each direction of the enclosure 
should bring no harmful effect.  
5 Prevent water spraying.  Water spray ed in  each direction of the enclosure 
should bring no harmful effect.  
6 Prevent powerful water 
spraying.  Powerful water spraying in each direction of 
enclosure should bring no harmful effect.  
7 Prevent short -while wa ter 
immersion effect.  After immersion in water under specified pressure 
for a specifi c period of time, the water volume 
having entered the enclosure should bring no 
harmful effect.  
8 Prevent continuous plunging 
effect.  After continuous plunging  according to the 
conditions agreed by the manufacturer and user (the 
conditions being stricter than those represented by 
the figure of 7), the water volume having entered the 
enclosure should bring no harmful effect.  
 GB 7260.1 -200x  
31 Appendix L  
 
(Standardised Appendix)  
Backfeed protection test  
 
L.1   Outline  
When the UPS is in stored energy mode, it s current  may not be over the limit  between 
any single pair of input terminals.  When the measured R.M.S. open circuit voltage  
value  does not exceed 30V (AC peak value 42.4V, DC 60V), t his test is not required . 
Check compliance through circuit analys es, test ing failed control circuit components, 
and the tests set out in  L.2 and L.3.  
L.2   Type A pluggable UPS and Type B pluggable  UPS  
When UPS is in stored energy mode and when its input t erminal or plug is cut off, 
both the idling and full load situations should meet the following conditions:  
a)  under normal conditions and any single malfunction condition, the current 
of any two circuit -tested user -accessible input terminals indicated in 
Appendix D should not exceed 3.5mA;  
b)  the AC input power should be cut off within 1 second.  
L.3   Tests of permanently connected UPS  
When UPS is function ing normally , there is the load of AC output current and the 
idling, and the components to be evaluat ed are made to be at a single malfunction 
situation. Then this malfunction should simulate the failed model of the component.  
After that, cut off the AC input power. Under normal conditions and single 
malfunction conditions, the current of any two input t erminals accessible to the  user 
should not exceed 3.5mA.  
If an external backfeed protective device is equipped, check its compliance through 
the inspection of the related circuit diagram and the circuit functioning test made by 
external backfeed isolator.  
The protective conductor of UPS should not be disconnected during the testing 
period.  
The AC input power should be cut off within 15 seconds.  
L.4   Single malfunction conditions  
For the L.2 and L.3  test methods , a single malfunction is confirmed on the fou ndation 
of circuit research. However,  it should also include the potential load failure, as well 
as the relative insulation failure.  
 
Single -phase output:  
 GB 7260.1 -200x  
32  
                        EUT  
 
                                                  C = 22 nF  
 
3-phase  output:  
 
                                                     3 x R 
                        EUT  
 
                                                  C = 22 nF  
 
In the figure:  EUT –– equipment under test  
 
Figure L.1   Load malfunction  
 
The value of the resistance load R should be equal to the maximum load of the unit 
power factor  as specified by the manufacturer.  GB 7260.1 -200x  
33 Appendix M  
 
(Standardised Appendix)  
Examples of standard load conditions  
 
M.1   Outline  
UPS can be loaded according to the technical conditions  specified  in the 
manufacturer’s operati ng manual. If no related technical condition s apply , the 
following standard load conditions shall apply . 
 UPS can be loaded with different linear and non -linear load s (see Subsection 3.3).  
If the sine wave voltage is a pplied to a load, the current flowing over the load is just 
the sine wave, and then it is defined as linear load.  
The current flowing in the non -linear load being applied with sine wave voltage is the 
non-sine wave.  
The most general kinds of linear load ar e: 
     –– Resistance;  
     –– Sensibility -resistance;  
     –– Capacitivity -resistance.  
Non-linear loads could be:  
     –– Rectified capacitive load;  
     –– Load controlled by thyristor or saturated electric reactor (phase control).  
For low power ranges o f less than 3kVA, the bridge -type rectifier connecting with  the 
capacitive load is most commonly used.  The following symbols are used to express 
the load characteristics:  
     S –– Output apparent power, with the unit  of volt-ampere (VA); 
     P –– Output active power, with the unit  of watt (W);  
      –– Power factor,  = P/S; 
     U –– Output voltage, with the unit  of voltage (V);  
     f –– Frequency, with the unit  of hertz (Hz).  
M.2   Standard resistance load  
For resistance load, UPS can add it to the st andard power.  
 
           U                RL  
 
M.3   Standard sensibility -resistance load  
Sensibility -resistance load is the series connection or parallel connection of an 
electrical inducer and an electrical resistor.  The values of electrical resistor R  and 
electrical inducer L are calculated using  the following formula e: GB 7260.1 -200x  
34 a) Series connection  
 
           U                RL  
 
b) Parallel connection  
 
           U      L         R  
 
M.4   Standard capacitivity -resistance load  
Capacitivity -resistance load is the series connection or parallel connection of an 
electrical capacitor and an electrical resistor. The values of electrical resistor R and 
electrical capacitor C are calculated by the following formulas:  
a) Series connection  
R = …… .                  C 
 
           U             R  
 
 C = …… . 
b)  Parallel connection  
R = …… .                   
 
           U     C      R  
 
 C = …… . 
 
M.5 Standard non -linear load  
In order to simulate the load of single -phase stationary rectifier/capacitor, the load 
connec ting to the UPS is a diode rectifying bridge. Its output terminal is connected 
with a parallel -connected  circuit of capacitor and resistor.  
     Note  1:   Below is referring to the maximum distortion 8% of the output voltage 50Hz 
(according IEC 61000 -2-2: 2002), power factor  = 0.7 (implying that 70% of the 
apparent power S serves as the active power consumed on the resistors R l and 
Rs). 
The entire single -phase load can be composed of a single load or multiple equivalent 
loads in parallel connection.  
      Note  2:  The resist or Rs can connect with the AC side or DC side of the rectifying bridge.  
      Note  3:  The actual value of element device for use in test should be within the following  
range of calculation values:  GB 7260.1 -200x  
35 ––Rs:  ± 10%;  
–– Rl:  Adjustable in tests so as to acquire  the rated output performance power;  
–– C:  +25%.  
 
                R s 
 
         U                      U C           Rl 
 
 
In the figure, UC  –– Rectified voltage value, with the unit of voltage (V);  
Rl  –– Load resistor, representing 66% of active power in  the entire 
performance power S. 
Rs  –– Series connection resistor, representing 4% of active power in the 
entire performance power S (a suggestion about cable voltage 
reduction according to IEC TC 64).  
 
Figure M.1   Standard non -linear load  
 
The ripple vo ltage is the capacitive voltage UC peak –– 5% of the peak value.  The 
corresponding time constant of UC is R l × C = 0.15s.  
Having observed the peak value voltage, power voltage distortion, cable voltage 
reduction and rectified voltage ripple, the average r ectified voltage value UC shall be: 
UC = 2 × (0.92 × 0.96 × 0.975) × U = 1.22 × U 
The values of resistors R s, R l and capacitor C are calculated according to the 
following formulas:  
     R s = 0.04 × U 2 / S 
     R l = UC 2 / (0.66  × S) 
     C = 0.15 S / Rl 
     Note  4:  The value of capacitor C is effective to 50Hz and the mixed design of 50Hz and 60Hz.  
M.5.1   Test methods  
a)  When the UPS under test is under the specified rated output voltage, the 
standard non -linear load is connected to the AC input power ; 
b)  When supplying power to the standard load, the AC input wave shape 
distortion caused by AC input power impedance should not exceed 8%;  
c)  Adjust the resistor R l until the output apparent power S of the UPS under 
test equals to the specified rated va lue; 
d)  After the resistor R l is adjusted, the standard non -linear load is connected 
to the output of the UPS under test, and adjustment cannot be made GB 7260.1 -200x  
36 anymore;  
e)  According to the requirements of appropriate regulations, all the tests 
carried out for ac quiring the required parameters under the non -linear load 
should adopt standard load, and adjustment cannot be made anymore.  
M.5.2   Connection of standard non -linear load  
a)  The apparent power S used by the single -phase UPS at 33kVA and below is 
equal to  the standard non -linear load of the rated apparent power of UPS;  
b)  The apparent power used by the single -phase UPS at the rated value of 
above 33kVA is the standard non -linear load of 33kVA, and is added with 
linear load, acquiring the rated values of t he apparent power and active 
power of UPS;  
c)  The 3 -phase UPS with its design adopting the single -phase load, apparent 
power and the rated value of active power being 100kVA and below should 
connect 3 equivalent single -phase non -linear load to between the  UPS 
phase line and neutral line or between phase lines (depending on the 
national electric network allocation applicable to the UPS design);  
d)  The 3 -phase UPS with the rated value of above 100kVA should select the 
load according to C), and should be add ed with linear load, acquiring the 
rated values of the apparent power and active power of UPS.  GB 7260.1 -200x  
37 Appendix N  
 
(Standardised Appendix)  
Ventilation of storage battery cabinet  
 
N.1   Outline  
Under great current discharge, overcharging or similar situations, the  opened storage 
battery release s gas, so its enclosure or cabinet should be well ventilated. Ventilation 
allows air to circulate, which decrease s the danger of pressure and accumulation 
caused by mixed gas (e.g. hydrogen and air), and  helps to avoid person al harm.  
The arc starting parts (such as the contact terminals of switch, disconnector and relay) 
should not be located inside the enclosure or cabinet placed with opened storage 
battery.  The enclosure or cabinet should not emit gas around the arc startin g parts.  
Fuse and connecting devices do not include the arc starting parts.  The monitoring 
sensor of storage battery or storage battery cabinet (e.g. temperature sensor or similar 
objects) should be placed in the enclosure or cabinet.  
If the mixed gas (s uch as hydrogen and air) is lighter than air, it is required to open a 
ventilation opening at the top end of the enclosure or cabinet because mixed gas can 
be accumulated at this part easily.  
N.2   Concentration of hydrogen  
According to the above contents,  the ventilation measures should prevent the 
concentration of hydrogen from exceeding 4% of the capacity.  If sufficient 
ventilation cannot be obviously acquired, the concentration of gas should be measured 
according to the ventilation test of storage batt ery cabinet in Subsection N.4.  Under 
the circumstances that lead -acid storage battery is full, if large part of electric energy 
is converted as gas, every 63Ah of each lead -acid storage battery unit releases about 
0.0283m3 of hydrogen.   Please refer to Su bsection N.4.  
N.3   Blocking situation  
The ventilation measures of the enclosure or cabinet placed with storage battery 
should meet the requirements of abnormal conditions, including the locked turning of 
fan and the blockade of ventilation filter.  
N.4   O vercharging test  
If a measurement is required to judge whether the storage battery cabinet meets the 
requirements set out in  Subsection N.2, the storage battery should undergo an 
overcharging test (see Subsection 7.6.8).  Both d uring and after test ing, the highest 
concentration of hydrogen should not exceed 2% of the capacity (the safety 
coefficient is 2).  During the test, intermittent collection of gas in 2h, 4h, 6h and 7h 
and tests should be carried out at the place inside the storage battery cabinet where the GB 7260.1 -200x  
38 highest possible hydrogen concentration  lies. 
When connected to the power supply circuit , which is  adjusted to 106% of the rated 
voltage of UPS, the storage battery power supply system of UPS must overcharg e the 
full storage battery for 7h. Adjust a ny control of charger or charging circuit adjustable 
by user, making it situated at the strictest charging speed.  
     Exception 1:  this requirement does not apply  to storage batter ies connected 
with UPS but not evaluated together.  
     Exception 2: this requirement  does not apply  to UPS equipped  with an 
adjustable circuit, preventing the rise of charging current of storage battery when the 
AC input voltage rises from the rated value to its 106%.  
     Exception 3: the following formula can be used to ensur e the ventilation 
requirements of this Appendix.  
For equalised charging (boost  charging) and valve -controlled storage batter ies, this is 
carried out  under  a broader environmental temperature range. The coefficient “I” 
should adopt 2.4V/unit.  
The necessary ventilation airflow of storage battery cabinet should be calculated by 
the following formula:  
Q = v × q × s × n × I × C 
where:  
Q –– Ventilated airflow volume, with the unit of cubic meter per hour (m3/h); 
v –– Necessary dilution value of hydrogen, being ( 100 – 4) /4 = 24;  
q –– Hydrogen produced by 0.45 ×10-3 m3/Ah; 
s –– Safety coefficient, e.g. s = 5; 
n –– Number of storage battery units;  
I = 2A/100Ah –– Traditional rich -solution storage battery;  
I = 1A/100Ah –– Low -antimony alloyed rich -solution storage b attery;  
I = 0.5A/100Ah –– Rich -solution storage battery with hydrogen release bolt;  
I = 0.2A/100Ah –– Valve -controlled lead -acid storage battery;  
C –– Nominal capacity of storage battery, with the unit of ampere -hour (Ah), 
and the discharge speed is 10h.  
vqs = 0.54 m3/Ah can be employed to simplify the above formula as:  
Q = 0.54  × n × I × C 
Ventilation volume should better be guaranteed by natural ventilation; otherwise, 
compulsory ventilation  is needed.  
It should be guaranteed that air is able to  enter  and leave  the inlet and outlet. The 
average airflow speed should be 0.1m/s.  
When subjected to  natural ventilation, the storage battery cabinet  should have both an 
air inlet and outlet , around which should be  an obstacle -free space, K1 = 28h cm2/m3 GB 7260.1 -200x  
39 A  K1 Q 
where:  
A –– Area of ventilation opening, with the unit of square centimeter ( cm2); 
K1 = 28h cm2/m3. 
Or 
A  K2 n I X  
     where:  
K2 = 1.51 cm2/A. 
     Note : if hydrogen -producing electric energy is maintained  below a certain limit, 
natural ventilatio n appli es; otherwise, the ventilation opening should be greater than 
the permitted size. The limited conditions of natural ventilation are determined by 
the capacity of storage battery, the number of storage battery units and the 
technology of storage batt ery (opened storage battery unit or valve -controlled 
storage battery unit) as well as the charging  voltage applied to the storage battery.  
Suppos ing that  the heat -generating (exceeding 300oC) or spark -producing components 
and the ventilation opening of  the storage battery or air pressure outlet are  maintained 
at a sufficient distance, using the above calculation method may reach the reliable 
anti-explosion level . In the storage battery chamber, a distance of 500mm can be 
thought to be sufficiently safe. In the storage battery cabinet and the storage battery 
box, or the internal storage battery of UPS, the above distance can be appropriately 
decreased according to the ventilation conditions.  
The abovementioned  strictest charging speed is the maximum charging speed that will 
not cause the overheat ing and overcurrent protective device to disconnect.  GB 7260.1 -200x  
40 Appendix X  
 
(Informative Appendix)  
Disconnection guide for storage battery during  Transportation  
 
X.1   Applicable products  
This Appendix applies to UPS and storage  battery box es equipped with an internal 
storage battery. Currently, the following requirements only serve as guidelines. In the 
future, th is Appendix may become a Standardised Appendix.  
X.2   Disconnection of storage battery  
The manufacturer should provi de a storage battery disconnection method for the 
purpose of transportation.  The disconnection should aim to be close to the storage 
battery  as possible , and situated in front of any other circuit (including the printed 
circuit board) or electrical device  to which  the storage battery is connected . 
X.3   Packaging tags / labels  
Warning tags should be stuck on to the transportation carton, stating whether the 
storage battery in the  package is connected.  
Before transportation, the manufacturer should affix the tag shown in  Figure X.1 to 
the product when the  storage battery  is disconnected.  
  No Damage  
 
 
      -    +  
        Pb         r 
 
Storage battery not connected.  Disclosure of Storage Battery 
Prohibited  
Any deformation, cracking or damage of transport ation 
carton would make the goods disclosed, so it should be 
placed in an isolated area and checked by qualified 
staff.  If the package is thought to be unavailable for 
transportation, the goods should be rapidly collected 
and isolated, and the carrier and  shipper should be 
contacted.  
Figure X.1   Warning tag of products to be transported with storage battery 
disconnected.  
 
Before transportation, the manufacturer should affix  the tag shown in  Figure X.2 tothe 
product when the  storage battery is disconnecte d. GB 7260.1 -200x  
41  
  No Damage  
 
 
      -    +  
        Pb         r 
 
Storage battery is connected.  Disclosure of Storage Battery 
Prohibited  
Any deformation, cracking or damage of transportation 
carton would make the goods disclosed, so it should be 
placed in an isola ted area and checked by qualified 
staff.  If the package is thought to be unavailable for 
transportation, the goods should be rapidly collected 
and isolated, and the carrier and shipper should be 
contacted.  
Figure X.1   Warning tag of products to be trans ported with storage battery not 
disconnected.  
     Note :  In Figure X.1 and Figure X.2, the “Pb” inside the storage battery sign is applicable to 
the enclosed lead -acid storage battery.  As to the use of storage battery made of 
other chemical substances, a dopt the corresponding chemical signs.  
X.4   Damage inspection  
Any deformation, cracking or damage to the transportation carton would make the 
goods disclosed , so it should be placed in an isolated area and checked by qualified 
staff.  If the package is t hought to be unavailable for transportation, the goods should 
be rapidly collected and isolated, and the carrier and shipper should be contacted.  
The manufacturer should inform the transporter or handler of the applicable product 
guide.  
X.5   Importance o f safe handling procedures  
To ensure the safe air transportation of the equipment to different countries 
throughout the world,  the UPS manufacturer should carry out comprehensive tests.  
However, please note this important  fact: any damage to UPS with inte rnal storage 
battery and storage battery box may result in  fire, smoke or similar risks.  If there is 
any obvious danger, the products should be carefully handled and inspected 
immediately.  
 
______________________________