UGANDA STANDARD  
  US 662
First Edition
2008-12-11
 
 
Reference numbe r
US 662:2008
 © UNBS 2008 
  
Code of practice for inspection and acceptance of audio, video 
and similar electronics apparatus 
 US 662:2008 
ii © UNBS 2008 – All rights reserved
 Compliance with this standard does not, of itself confer immunity from legal obligations 
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2008  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, in cluding photocopying and microfilm, without prior written 
permission from UNBS. 
Requests for permission to reproduce this document should be addressed to 
The Executive Director 
Uganda National Bureau of Standards 
P.O. Box 6329 
Kampala  
Uganda 
Tel: 256 414 505 995 
Fax: 256 414 286 123 
E-mail: unbs@infocom.co.ug
Web: www.unbs.go.ug  US 662:2008 
© UNBS 2008 – All rights reserved  iii
 Contents Page 
Foreword .............................................................................................................................................................v  
1 Scope ......................................................................................................................................................1  
2 Normative references ............................................................................................................................2  
3 Terms and definitions ...........................................................................................................................2  
4 General requirements ...........................................................................................................................5  
5 Criteria for acceptance ..........................................................................................................................6  
5.1 Cleaning .................................................................................................................................................6  
5.2 Testing ....................................................................................................................................................6  
5.2.1 General ...................................................................................................................................................6  
5.2.2 Physical Inspection ............................................................................................................................... 6 
5.2.3 Performance Inspection .......................................................................................................................7  
5.3 Safety to user .........................................................................................................................................7  
5.4 Labels and marks ..................................................................................................................................8  
Annex A (normative)  Warehouse requirements .............................................................................................9  
A.1 Packaging ...............................................................................................................................................9  
A.2 Humidity .................................................................................................................................................9  
A.3 Storage temperature .............................................................................................................................9  
A.4 Disposal ..................................................................................................................................................9  
A.5 Verification .............................................................................................................................................9  
Annex B (informative)  Workshop requirements ..........................................................................................10  
B.1 Cleaning ............................................................................................................................... ................10  
B.2 Disposal ............................................................................................................................... .................10  
B.3 Safety at the workshop .......................................................................................................................10  
B.4 Power supply ............................................................................................................................... ........10  
B.5 Work platform ............................................................................................................................... .......10  
B.6 Working tools ............................................................................................................................... ........10  
B.7 Verification ............................................................................................................................... ............10  
Annex C (normative)  Marking and labels ......................................................................................................11  
C.1 Identification and supply ratings/marking ........................................................................................11  
C.2 TERMINALS ............................................................................................................................... ...........11  
Annex D (normative)  Tests .............................................................................................................................15  
D.1 Routine tests ............................................................................................................................... .........15  
D.1.1  General ............................................................................................................................... ..................15  
D.1.2  Protective earthing connection of screens and metal barriers ......................................................15  
D.1.3  Correct position of internal wiring .....................................................................................................15  
D.1.4  Correct fit of internal plug connections ............................................................................................15  
D.1.5  Safety relevant markings inside the apparatus ................................................................................15  
D.1.6  Correct mounting of mechanical parts .............................................................................................16  
D.1.7  Dielectric strength test ........................................................................................................................16  
D.1.8  Safety relevant markings on the outside of the apparatus .............................................................17  
D.2 Mechanical strength ............................................................................................................................17  
D.2.1  Complete apparatus ............................................................................................................................17  
D.2.2  Bump test ............................................................................................................................... ..............17  
D.2.3  Vibration test ............................................................................................................................... .........17  
D.2.4  Impact test ............................................................................................................................... .............17  
D.2.5  Drop test ............................................................................................................................... ................19  
D.2.6  Insulation resistance and dielectric strength ...................................................................................19  US 662:2008 
iv © UNBS 2008 – All rights reserved
 Annex E (normative)  Symbols used ............................................................................................................. 24  
E.1 Instructions ............................................................................................................................... .......... 24  
E.2 Stability and mechanical hazards ..................................................................................................... 25  
E.3 Fragmentation test .............................................................................................................................. 2 6 
E.4 Wall or ceiling mounting means ........................................................................................................ 26  
E.5 Ionizing radiation ............................................................................................................................... .2 7 
Bibliography ............................................................................................................................... ...................... 28  
 
 US 662:2008 
© UNBS 2008 – All rights reserved  v
 Foreword 
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry  of Tourism, Trade and 
Industry established under Cap 327, of the Laws of Uganda.  UNBS is mandated to co-ordinate the 
elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex A limentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT/SPS Agr eements of the World Trade Organisation (WTO). 
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a gi ven field or area and consists of representatives of 
consumers, traders, academician s, manufacturers, governme nt and other stakeholders. 
Draft Uganda Standards adopted by the Technical Committ ee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
Committee membership 
The following organisations were represented on the Technical Committee for Electrotechnology standards 
UNBS/TC 6 in the development of this standard:  
• Civil Aviation Authority (CAA) 
• Directorate of Industrial Training (DIT) 
• Electricity Regulatory Authority (ERA) 
• Hi-Tech Metal Industries Ltd.  
• Kampala City Traders Association (KACITA) 
• Kyambogo University 
• Ministry Works and Transport 
• National Environment Management Authority (NEMA) 
• Uganda Batteries Limited 
• Uganda Electronics and Technicians Association (UETA) 
• Uganda National Bureau of Standards  US 662:2008 
vi © UNBS 2008 – All rights reserved
 Introduction 
This introduction is intended to provide an appreciation of the principles on which the requirements of this 
code of practice are based; it shall be read together  with the relevant standard US IEC 60065 on all safety 
aspects. Such an understanding is essential in order that safe apparatus can be assured. 
The requirements of this code are intended as well to provide protection to persons and to the surroundings of the apparatus. 
Attention is drawn to the principle that the requirements specified are the minimum considered necessary to 
establish a satisfactory level of safety. 
NOTE The expression “protection to the surroundings of t he apparatus,” implies that this protection should also 
include protection of the natural environm ent in which the apparatus is intended to  be used, taking into account the life 
cycle of the apparatus, that is, manufactu ring, use, maintenance, disposal and possibl e end-of-life recycli ng of parts of the 
apparatus. 
The application of this code is intended to prevent  injury or damage due to the following hazards: 
• electric shock;  
• excessive temperatures;  
• radiation; 
• implosion; 
• mechanical hazards; 
• fire. 
Electric shock is due to current passing through the human body. Current s of the order of a milliampere can 
cause a reaction in persons in good health and may cause secondary risks due to involuntary reaction. Higher 
currents can have more damaging effects. Voltages below certain limits are generally regarded as not 
dangerous under specified conditions. In order to provi de protection against the possi bility of higher voltages 
appearing on parts which may be touched or handled, such parts are either earthed or adequately insulated. 
For parts, which can be touched, two levels of prot ection are normally provided to prevent electric shock 
caused by a fault. Thus a single fault and any consequential faults will not create a hazard. The provision of 
additional protective measures, such as supplementary in sulation or protective earthing, is not considered a 
substitute for, or a relief from, properly designed ba sic insulation. The following table gives examples of 
causes and what can be done to prevent them. US 662:2008 
© UNBS 2008 – All rights reserved  vii
 Table 1 — Causes of hazards and their prevention 
Cause Prevention 
Contact with parts normally at hazardous 
voltage Prevent access to parts at hazardous voltage by fixed or locked covers, interlocks, etc. discharge capacitors at 
hazardous voltages 
Breakdown of insulation between parts normally at hazardous voltage and accessible parts Either use double or reinforced insulation between parts normally at hazardous voltages and accessible parts so that breakdown is not likel y to occur, or connect 
accessible conductive parts to protective earth so that the voltage which can develop is limited to a safe value. The insulations shall have adequate mechanical and electrical strength. 
Breakdown of insulation between parts normally at hazardous voltage and circuits normally at non-hazardous voltages, thereby putting accessible parts and terminals at hazardous voltage. Segregate hazardous and non-hazardous voltage circuits either by double or reinforced insulation so that breakdown is not likely to occur, or by a protective earthed screen, or connect the circuit normally at non-hazardous voltage to protective earth, so that the voltage which can develop is limited to a safe value. 
Touch current from parts at hazardous voltage through the human body. 
(Touch current can include current due to RFI filter components connected between mains supply circuits and accessible parts or terminals.) 
 Limit touch current to a safe value or provide a protective earthing connection to the accessible parts. 
 
 
Requirements are included to prevent injury due to ex cessive temperatures of accessible parts, to prevent 
damaging of insulation due to excessive internal tem peratures, and to prevent mechanical instability due to 
excessive temperatures developed inside the apparatus US IEC 60065 
Requirements are included to prevent injury due to excessi ve energy levels of ionizing and laser radiation, for 
example by limiting the radiation to  non-hazardous values US IEC 60065 
Requirements are included to prevent injury due to implosion of picture tubes US IEC 60065. 
Requirements are included to ensure that the appara tus and its parts mechanical strength and stability, to 
avoid the presence of sharp edges guarding or interlocking of dangerous moving parts (shall be read together 
with US IEC 60065 
A fire can result from 
• overloads, 
• component failure, 
• insulation breakdown, 
• bad connections, and 
• arcing. 
The following preventive measures are recommended: US 662:2008 
viii © UNBS 2008 – All rights reserved
 • use of suitable components and subassemblies; av oidance of excessive temperatures which might 
cause ignition under normal or fault conditions; 
• use of measures to eliminate potential ignition sour ces such as inadequate contacts, bad connections, 
interruptions; 
• control of the position of combustible materi als in relation to potential ignition sources;  
• compliance of encapsulation or barriers to limit the spread of fire within the apparatus; and 
• compliance of suitable fire retardant materials for the enclosure. UGANDA STANDARD US 662:2008
 
© UNBS 2008 – All rights reserved  1
 Code of practice for inspection and acceptance of audio, video 
and similar electronics apparatus 
1 Scope 
1.1 This Code of practice is intended to form a basi c reference document for acceptable used electronic 
apparatus in Uganda and promote the safe usage and dumping of used electronic apparatus to safeguard the 
environment. 
Any contract adhering to these general procedures with the intention of providing such safe and performing 
used electronic apparatus should be eligible  to apply for certification to this code. 
1.2 This code of practice applies to used electronic apparatus designed to be fed from the mains, from a 
supply apparatus, from batteries or from remote pow er feeding and intended for reception, generation, 
recording or reproduction respectively of audio, video and associated signals. 
1.3 This code also concerns apparatus intended for hous ehold and similar general use but which may also 
be used in places of public assembly such as school s, theatres, places of worship and the workplace. 
This code should be read in conjunction wi th the relevant parts of IEC 60065.  
Some examples of apparatus within the scope of this code are: 
i) receiving apparatus and amplifiers for sound and/ or vision (radios, television, VCRs, VCDs, DVDs, 
etc); 
ii) independent load transducers and source transducers; 
iii) supply apparatus intended to supply other apparatus covered by t he scope of this code; 
iv) electronic musical instruments,  and electronic accessories such  as rhythm generators, tone 
generators, music tuners and like for use with elec tronic or non-electronic musical instruments; 
v) audio and/or video educational apparatus; 
vi) video projectors, film projectors, and overhead projectors; 
vii) video cameras and video monitors; 
viii) video games and flipper games; 
ix) juke boxes; 
x) electronic gaming and scoring machines; 
xi) teletext equipment; 
xii) record and optical disc players; 
xiii) tape and optical disc recorders; US 662:2008 
2 © UNBS 2008 – All rights reserved
 xiv) antenna signal converters and amplifiers; 
xv) antenna positioners; 
xvi) Citizen’s Band apparatus; 
xvii) apparatus for imagery; 
xviii) electronic light effect apparatus; 
xix) apparatus for use in alarm systems; 
xx) intercommunication apparatus, using low voltage mains as the transmission medium; 
xxi) cable head end receivers; 
xxii) professional general use amplifiers, record or disc players, tape players, recorders, and public 
address systems; and 
xxiii) professional sound/video systems. 
1.4 This code applies to apparatus with  a rated supply voltage not exceeding 
• 250 V a.c. single phase or d.c. supply; and 
• 433 V a.c. in the case of apparatus for co nnection to a supply other than single-phase. 
2 Normative references 
The following referenced documents are indispensable for the application of this document. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies. 
IEC 60065,  Audio, video and similar electronic apparatus — Safety specification 
ISO 306, Plastics — Thermoplastics — Determination of Vicat softening temperature (VST) 
3 Terms and definitions 
For the purposes of this standard, the following terms and definitions shall apply. 
3.1 
used electronics apparatus 
electronics apparatus that is not ne w; second hand, that is, previously used or owned by another user 
3.2 
audio amplifier 
either an independent audio signal amplifying apparatus or the audio signal amplifying part of an apparatus to 
which this standard applies 
3.3 
electronic musical instrument 
electronic apparatus such as an electronic organ, electronic piano or music synthesizer that produces music under the control of the user US 662:2008 
© UNBS 2008 – All rights reserved  3
 3.4 
supply apparatus  
apparatus which takes power from the mains and from which one or more other apparatus are fed 
3.5 
supply apparatus for general use 
supply apparatus which can be used without special meas ures not only for the supply of apparatus within the 
scope of this standard, but also for the supply of other appliances or devices, for example pocket-calculators 
3.6 
special supply apparatus  
supply apparatus which is designed to be used only fo r the supply of specified apparatus within the scope of 
this standard 
3.7 
laser system 
laser in combination with an appropriate laser energy  source with or without additional incorporated 
components  
3.8 
laser 
device which can be made to produce or amplify electr omagnetic radiation in the wavelength range from 180 
μm to 1 mm primarily by the process of controlled stimulated emission  
NOTE Devices to which this definition does not apply are Light Emitting Diodes  (LEDs) used for displays, infrared 
remote controls, infrared audio/visual signal transmission and optical couplers. 
3.9 
imagery 
processing, editing, manipulation and/or storing of video signals 
3.10 
remote control 
controlling of an apparatus from a distance, for example me chanically, electrically, acoustically or by means of 
radiation 
3.11 
portable apparatus  
specific apparatus designed to be carried easily, the mass of which does not exceed 18 kg 
3.12 
transportable apparatus  
apparatus, the mass of which exceeds 18 kg, specifica lly designed to be moved frequently from place to place 
NOTE Examples of transportable ap paratus are musical instruments and their associated amplifiers. 
3.13 
professional apparatus 
apparatus for use in trades, professions or industries and which is not intended for sale to the general public 
NOTE The designation should be specified by the manufacturer. 
3.14 
rated supply voltage 
supply voltage or voltage range (for three-phase supply,  the line-to-line voltage) for which the manufacturer 
has designed the apparatus US 662:2008 
4 © UNBS 2008 – All rights reserved
 3.15 
operating voltage 
highest voltage, non-repetitive transients being disregarded,  to which the insulation under consideration is, or 
can be subjected when the apparatus is operating at its rated supply voltage under normal operating 
conditions 
3.16 
rated current consumption 
current consumption of an apparatus operating at its rated supply voltage under normal operating conditions 
3.17 
available power 
maximum power which can be drawn from the supplying circuit through a resistive load whose value is chosen 
to maximize the power for more than 2 min when the circuit supplied is disconnected 
3.18 
required withstand voltage 
peak voltage that the insulation under consideration is required to withstand 
3.19 
rated power consumption  
power in watts consumed in an apparatus operating at its rated supply voltage under normal operating 
conditions 
3.20 
mains  
power source with a nominal voltage of more than 35 V (pea k) a.c. or d.c. which is not used solely to supply 
apparatus specified in Clause 1 of IEC 60065 
3.21 
permanently connected apparatus  
apparatus which is intended for connection to the mains by a connection which cannot be loosened by hand 
3.22 
directly connected to the mains 
electrical connection with the mains in such a way that a connection to either pole of the mains causes in that 
connection, a permanent current equal to or greater t han 9 A, protective devices in the apparatus being not 
short-circuited 
NOTE A current of 9 A is chosen as the minimum breaking current of a 6 A fuse. 
3.23 
terminal 
part of an apparatus by which connection is made to ex ternal conductors or other apparatus. It may contain 
several contacts. 
3.24 
protective earthing terminal 
terminal to which parts are connected which are r equired to be connected to earth for safety reasons 
3.25  
class 01 appliance 
appliance having at least basic insulation throughout and incorporating an earthing terminal but having a supply 
cord without earthing conductor and a plug without earthing contact 
3.26 
Class I appliance 
appliance in which protection against electric shock does not rely on basic insulation only but which includes 
an additional safety precaution, in that conductive acce ssible parts are connected to the protective earthing 
conductor in the fixed wiring of the installation in su ch a way that conductive accessible parts cannot become US 662:2008 
© UNBS 2008 – All rights reserved  5
 live in the event of a failure of the basic insulation 
NOTE This provision includes a protective earthing conductor in the supply cord. 
3.27 
Class II appliance 
appliance in which protection against electric shock do es not rely on basic insulation only but in which 
additional safety precautions are provided, such as double insulation or reinforced insulation, there being no 
provision for protective earthing or reliance upon installation conditions 
NOTE 1 Such an appliance may be of one of the following types: 
a) an appliance having a durable and substantially continuo us enclosure of insulating material which envelops all 
metal parts, with the exception of smal l parts, such as nameplates, screws and rivets, which are isolated from live 
parts by insulation at least equivalent to reinforced insulation; such an appliance is called an insulation-encased 
class II appliance; 
b) an appliance having a substantially continuous metal enclosure, in which double insulation or reinforced 
insulation is used throughout; such an appliance is called a metal-encased class II appliance; and 
c) an appliance which is a combination of an insulation-encased class II appliance and a metal-encased class II 
appliance. 
NOTE 2 The enclosure of an insulation-encased class II app liance may form a part or the whole of the supplementary 
insulation or of the reinforced insulation. 
NOTE 3 If an appliance with double insulation or reinforced insulation throughout has provision for earthing, it is 
considered to be a class I appliance or a class 01 appliance. 
3.28 
portable appliance 
appliance that is intended to be moved while in operati on or an appliance, other than a fixed appliance, having 
a mass less than 18 kg 
3.29 
stationary appliances 
fixed appliance or an appliance which is not a portable appliance 
4 General requirements 
The apparatus shall posses its original design and c onstruction as to present no danger when used for its 
intended purpose, either in normal operating conditions  or under fault conditions, particularly providing 
protection against 
a) hazardous currents passing throug h the human body (electric shock), 
b) excessive temperatures, 
c) hazardous radiation, 
d) effects of implosion and explosion, 
e) mechanical instability, 
f) injury by mechanical parts, and 
g) start and spread of fire. US 662:2008 
6 © UNBS 2008 – All rights reserved
 In general, compliance is checked by inspection and und er operating conditions, as specified in 5.2 of this 
code, by carrying out the re levant tests specified. 
5 Criteria for acceptance 
5.1 Cleaning 
Video, audio and similar electronic apparatus shall be cl eaned in the inside and outside of the architecture of 
the apparatus; this should be achieved by using the relevant cleaning devices/agents. Care shall be taken to 
avoid wetting/damaging internal components. 
Compliance shall be checked by inspection. 
5.2 Testing 
5.2.1 General 
The tests below and inspection shall be carried out together with the tests of A nnex D referenced from IEC 
60065. 
5.2.2 Physical inspection 
5.2.2.1 Name plate/tag 
The apparatus shall have their design name plates/tags carrying rating specif ications, year of manufacture or 
information leading to knowledge of year of manufactu re, caution/warnings and relevant safety graphical 
labels in well understood symbols. 
Compliance is checked by inspection. 
5.2.2.2 Life span 
The apparatus shall not be older than four years from year of manufacture. 
Compliance is checked by inspection. 
5.2.2.3 External architecture and internal components 
For equipment intended for use, all parts of the equipment shall be working, including the tuner knobs, CD 
compartments and cables leads. For equipment under spare category, separate containers carrying a label 
describing the intent shall be placed at a convenient location of the container and apparatus. 
Compliance is checked by physical inspection and the use of relevant testing devices such as multimeters, 
signal meters, phase testers, etc. 
5.2.2.4 Radioactive emissions 
Radioactive emissions (laser beam) such as CD/DVD  beam and other hazardous emissions shall screened 
from the user, and shall bear their design covers and safety labels or marks. 
Compliance is checked by inspection. US 662:2008 
© UNBS 2008 – All rights reserved  7
 5.2.2.5 Moving parts 
These shall be well covered and protected. When in operation, moving parts shall be isolated so as to protect 
the user from harm. 
Compliance is checked by inspection. 
5.2.2.6 Physical breakage and burns 
The apparatus shall be free from traces of burns or  breakage, whether in the inside parts or outside 
architecture. 
Compliance is checked by inspection. 
5.2.2.7 Operation manual/directives  
The apparatus should carry their operations manual or inst ructions in symbols that can be well interpreted and 
understood to guide the user. 
Compliance is checked by inspection. 
5.2.3 Performance Inspection 
5.2.3.1 Power test 
The apparatus shall work when powered from the main s voltage of max. 250 V a.c. for single phase and/or 
433 V a.c. max. for phase more than one appliances and/or batteries as quoted on the appliance 
specifications, the apparatus shall work  for compliance to the requirements. 
5.2.3.2 Frequency compliance  
The apparatus shall work when tested at the various national and international transmission frequencies of operations and power supp ly frequency of 50/60 Hz. 
Compliance is checked by powering the apparatus and manually or automatically searching for available signals for the relevant channels. 
5.2.3.3 Overheating 
It shall not overheat when powered from its rated supply voltage and frequency (240 VAC. and 50/60 Hz 
respectively, or for 110 V AC, a.c. appliances supplied fr om a step down transformer, or battery supplied) for 
not longer than 30 min.  
Compliance is checked by inspection. 
5.3 Safety to user 
5.3.1  The apparatus shall fulfil requirements of clause 4 of this code, together with all other safety 
requirements specified in this code. 
5.3.2  Power supply cables and parts shall have their insulation intact.  
Compliance is checked by inspection and use of multimeters and resistance testing meters. 
5.3.3  The apparatus shall posses the design earthing label s on their name plates, symbolising the form of 
earth protection used in the device in question. Power s upply shall be chosen in consistency with the earthing 
provisions. US 662:2008 
8 © UNBS 2008 – All rights reserved
 Compliance is checked by inspection. 
5.4 Labels and marks 
The following shall be observed together with the labelling and marking requirements of Annex C of this code 
of practice, referenced from IEC 60065: 
a) shall bear date of manufacture on name plate or on a clear acceptable reference plate or information 
leading to the knowledge of the year of manufacture.  
Compliance is checked by inspection and by rubbi ng the marking by hand for 15 s with a piece of 
cloth soaked with water and, at a different place or on a second sample, for 15 s with a piece of cloth 
soaked in petroleum spirit. After this the marking sh all be legible; it shall not be easily possible to 
remove marking plates and they shall show no curling. Petroleum spirit, to be used for reference 
purposes is defined as an aliphatic solvent hexane having a maximum aromatics content of 0.1 % by 
volume, a kauri-butanol value of 29, an initial bo iling point of approximatel y 65 °C, a dry-point of 
approximately 69 °C and a specific mass of approximately 0.7 kg/L; 
b) shall have passed all the required tests of 5.2, together with the te sts of Annex D of this code then 
shall be stamped or tagged using an appropriate tagging by the testing authority.  
Compliance is checked by inspection. 
The stamp or tag of the testing authority shall bear the following: 
i) date of test; 
ii) testing authority and/or dealer’s identity; and 
iii) remark: PASSED TEST  or FAILED TEST; 
c) The dealer shall guarantee the user assuranc e of operation of apparatus for a minimum period of 
three months. 
Table 2 — Checklist for acceptance requirements 
S/N Parameter Requirement 
1 Physical architecture • Free from dust and dirt 
• Free from breakage and burns 
• Check for exposed parts 
• Name/specification plate 
o rating 
o cautions and warnings 
o manufacture details, including year of 
manufacture 
o shall not be more than four years old 
• Control buttons, knobs and gauges shall be in 
working order 
• Insulated cables 
• Earthing continuity 
• Testing status tagging 
2 Performance • Shall pass power tests 
• Shall not overheat US 662:2008 
© UNBS 2008 – All rights reserved  9
 Annex A 
(normative) 
 
Warehouse requirements  
A.1 Packaging 
No appliances shall be packed one on top of the other; a ppliances shall be stored on shelves or enclosed in 
boxes in a dust free environment; safety routes in case  of fire shall be kept clear and free of obstacles. 
A.2 Humidity 
The warehouse shall be free from moisture or dripping water and a relative humidity of 75 % maximum. 
A.3 Storage temperature 
The warehouse shall be free from direct sunshine expos ure, an ambient temperature of between 15 ºC to 35 
ºC. 
A.4 Disposal 
Disposal shall not pose any threat to the environment in any way, whether by method of storage, cleaning, 
disposal or any other handling of the electronic devices. Cathode Ray Tubes (CRTs) shall be disposed as 
hazardous wastes following national regulations on disp osal of hazardous wastes and printed boards together 
with metallic parts disp osed as solid wastes. 
The disposal shall be appropriately conducted, that is  components of similar properties shall be collected in 
the same bins sorted for recycling and collection by the appropriate licensed personnel. 
A.5 Verification 
The dealer shall ensure verification of conformanc e to the requirements of Annex A and this code. US 662:2008 
10 © UNBS 2008 – All rights reserved
 Annex B  
(informative) 
 
Workshop requirements  
B.1 Cleaning 
Clean water together with appropriate detergents shoul d be used for cleaning of sticky dirt, blowers for 
removal of dust together with appropriate brushes. 
B.2 Disposal 
This shall be as specified in A.4. 
B.3 Safety at the workshop 
Safety gadgets such as; nose masks, fire fighting equipment, gloves, etc., shall be put in place. The workshop 
shall be out of bounds to non-technical members and sha ll be manned by the help of trained technical experts 
or professionals. 
B.4 Power supply 
Regulated and protected power supply controlled from a ma in switch (either automatic or manual) shall be in 
place. 
B.5 Work platform 
There shall be a safe and clear work platform. 
B.6 Working tools 
Professional and environmentally sensitive working tools shall be in place. 
B.7 Verification 
The dealer shall ensure verification of conformanc e to the requirements of Annex B and this code. US 662:2008 
© UNBS 2008 – All rights reserved  11
 Annex C 
(normative) 
 
Marking and labels  
C.1 Identification and supply ratings/marking 
The letter symbols, graphical symbols for quantities and units shall be as shown below. 
Compliance is checked by inspection. 
The apparatus shall be marked with the following: 
a) maker's or responsible vendor's name, trade mark or identification mark;  
b) model number or type reference; 
c) the symbol for CLASS II appliance, if applicable 
d) nature of supply: 
i) a.c. only with the symbol: 
ii) d.c. only with the symbol: 
iii) a.c. or d.c. with the symbol: 
RATED SUPPLY VOLTAGE or range of the RATED SUPPLY VOLTAGES which can be applied without 
operating a voltage setting device. Apparatus which ca n be set to different RATED SUPPLY VOLTAGES or 
ranges of RATED SUPPLY VOLTAGES shall be so that t he indication of the voltage or range of voltages to 
which the apparatus is set, is discernible on the appar atus when ready for use. S hall have a solidus for USER 
selectable ratings, for example "110/230 V" and a hyphen for a rating range, for example "110 V - 230 V"; rated MAINS frequency (or range of frequencies) in hert z, if safety is dependent on the use of the correct 
MAINS frequency; 
 
RATED CURRENT CONSUMPTION or RATED POWER CONSUMPTION of apparatus which can be 
supplied by SUPPLY APPARATUS FOR GENERAL USE. As an alternative, the information may be given in 
the instruction manual. The measured consumption at RATED SUPPLY VOLTAGE shall not exceed the marked value by more than 10 %;  
POWER CONSUMPTION MARKING for apparatus intended for connection to an a.c. MAINS supply other 
than single phase; 
RATED CURRENT CONSUMPTION or RATED POWER CONSUMPTION for apparatus intended for 
connection to an a.c. MAINS supply. The measured  consumption at RATED SUPPLY VOLTAGE shall not 
exceed the marked value by more than 10 %. Compliance is checked by inspection. 
C.2 TERMINALS 
TERMINALS shall carry the marks below. 
a) The wiring TERMINAL intended for connection of the protective earthing conductor associated with 
the supply wiring:  US 662:2008 
12 © UNBS 2008 – All rights reserved
  
  
This symbol shall not have been used for other earthing TERMINALS. 
b) TERMINALS which are hazardous live under norm al operating conditions, except TERMINALS for 
MAINS supply: 
 
 
 
 
 
Output TERMINALS provided for supply of other apparat us except MAINS supply shall be marked with the 
nominal output voltage and, in addition, the maximum output current, if with the most unfavourable load 
temperature rises higher than those allowed in Table 3 can occur, unless the TERMINALS are marked with 
the type references of the apparatus which are permitted to be connected. US 662:2008 
© UNBS 2008 – All rights reserved  13
 Table 3 — Permissible temperature rise of parts of the apparatus 
 
Conditions applicable to Table 3 
For tropical climates, permissible temperature rises of 10 K less than those specified in this table are required. The 
values of the temperature rises are based on a maximum ambient temperature of 35 °C for moderate climates and of 
45 °C for tropical climates. 
Where the temperatures are thermost atically limited by a THERMAL CUT-OUT  with automatic reset or a PTC 
THERMISTOR, the measured temperat ure on the part shall not exceed 35 °C plus the permitted rise of Table 3. For 
parts not likely to be touched during intended use, temperature rises up to 65 K are allowed under normal operating 
conditions. The required wooden test box shall not be used when evaluating access to parts likely to be touched. The following parts are considered not likely to be touched: 
• rear and bottom panels, except those incorporating switches or controls handled during normal use, 
• external heats inks and metallic parts directly coveri ng external heatsinks, except those on surfaces US 662:2008 
14 © UNBS 2008 – All rights reserved
 incorporating switches or controls handled during normal use; and 
• parts of the top surface which are more than 30 mm below the general pla ne of the top surface. 
For outside parts of metal which are covered with plastic material, the thickness of which is at least 0.3 mm, a 
temperature rise which corresponds to the permissible tem perature rise of the insulating material is allowed. 
If these temperature rises are higher than those allowed by the class of the relevant insulating material, the nature of 
the material is the governing factor. 
For the purpose of this code, the permissible temperature rises are based on service experience in relation to the 
thermal stability of the materials. The materials quoted are examples. For materials for which higher temperature limits 
are claimed, and for materials other than those listed, th e maximum temperatures shall not exceed those which have 
been proved to be satisfactory. 
Natural rubber and synthetic rubbers are not c onsidered as being thermoplastic materials. 
Due to their wide variety, it is not possible to specify a g eneric permissible temperature rise for thermoplastic materials. 
In order to determine the softening temperature of a spec ific thermoplastic material, the softening temperature as 
determined by the test 850 of ISO 306 shall be used. If the material is not known or if the actual temperature of the parts exceeds the softening temperature, the test described under i) shall be used. 
i) The softening temperature of  the material is determined on a separate specimen, under the 
conditions specified in ISO 306 with a heating rate of 50 . °C/h and modified as follows: 
• the depth of penetration is 0.1 mm; and 
• the total thrust of 10 N is applied before the dial gauge is set to zero or its initial reading noted. 
ii) The temperature limits to be considered for determining the temperature rises are: 
• under normal operating conditions, a temperatur e of 10 K below the softening temperature; and 
• under fault conditions, the softening temperature itself. 
If the required softening temperature exceeds 120 ˚C, condition C shall be taken into account. 
For switch mode transformers temperature rises may be measur ed with a thermocouple placed as close as practicable 
to the winding. The permitted temperature rise shall be 10 K less than that given in Table 3. 
Compliance is checked by inspection. 
Where in a manufacturer's service documentation, for example in circuit diagrams or lists of components, a symbol is 
used to indicate that a specific component shall be replaced only by the component specified in that documentation for 
safety reasons, the apparatus shall carry the following symbol: 
 
 
This symbol may also be put adjacent to the relevant component. 
This symbol shall not be placed on components. 
Compliance is checked by inspection.  
 
 US 662:2008 
© UNBS 2008 – All rights reserved  15
 Annex D 
(normative) 
 
Tests  
D.1 Routine tests 
D.1.1 General 
These tests are intended to reveal, as far as safety is concerned, unacceptable variations of the used 
apparatus. These tests do not impair the properties and the reliability of the apparatus, and should be made 
by the dealer on each apparatus.  
The dealer may use a test procedure which is better suit ed to his arrangements and may make the tests at an 
appropriate stage, provided it can be proved that that apparatus have the same degree of safety as apparatus that withstand the tests specified in this annex. 
The rules are given below as an example for ROUTINE TEST. 
D.1.2 Protective earthing connection of screens and metal barriers 
For CLASS I apparatus with a screen or metal barri er between HAZARDOUS LIVE parts and TERMINALS 
regarded as ACCESSIBLE or ACCESSIBLE conductive parts respectively, the continuity of the protective 
earthing connection should be checked as late as possi ble during the process of product circulation between 
the screen or metal barrier and the protective earthing contact of the MAINS plug or appliance inlet, or the 
PROTECTIVE EARTHING TERMINAL in case of a PERMANENTLY CONNECTED APPARATUS. The test 
current applied for 1 s to 4 s should be in the order of 10 A a.c., derived from a source having a no-load 
voltage not exceeding 12 V. 
The measured resistance should not exceed 
• Ω for apparatus with a detachable power supply cord, and 
• Ω for apparatus with a non-detachable power supply cord. 
NOTE Care should be taken that the contact resistance bet ween the tip of the measuring probe and the metal parts 
under test does not influence the test results. 
D.1.3 Correct position of internal wiring 
If incorrect position of internal wiring might impair the safety, the correct position of internal wiring should be 
checked by inspection. 
D.1.4 Correct fit of internal plug connections 
If incorrect fit of internal plug connections might impair the safety, the correct fit of internal plug connections 
should be checked by inspection or manual test. 
D.1.5 Safety relevant markings inside the apparatus 
The legibility of markings relevant to safety inside the apparatus, for example with regard to fuse-links, should 
be checked by inspection. US 662:2008 
16 © UNBS 2008 – All rights reserved
 D.1.6 Correct mounting of mechanical parts 
If incorrect mounting of mechanical parts might impair the safety, the correct mounting should be checked by 
inspection or manual test. 
D.1.7 Dielectric strength test 
The insulation of the apparatus should be checked by  the following tests. In general, these tests are 
considered to be sufficient. 
An a.c. test voltage of substantially sine-wave form, having MAINS frequency, or a d.c. test voltage or a 
combination of both with a peak value specified in table below, is applied between the MAINS supply 
TERMINALS connected in parallel and: 
• TERMINALS regarded as ACCESSIBLE, and  
• ACCESSIBLE conductive parts respectively, 
which may become HAZARDOUS LIVE in the event of an in sulation fault as a result of incorrect assembly. 
NOTE 1 TERMINALS regarded as ACCESSIBLE and ACCESSI BLE conductive parts may be connected together 
during the dielectric strength test.  
Table 4 — Test voltage 
Test voltage 
V (peak) a.c. or d.c. 
Application of test voltage 
Rated MAINS voltage 
≤150 Rated MAINS voltage 
>150 
BASIC INSULATION 1 130 
(800 r.m.s.) 2 120 
(1 500 r.m.s.) 
DOUBLE or REINFORCED 
INSULATION 2 120 
(1 500 r.m.s.) 3 540 
(2 500 r.m.s.) 
 
Before the test voltage is applied, intimate contact should be made with the specimen.  
Initially, not more than half of the prescribed test vo ltage is applied, then it is raised with a steepness not 
exceeding 1 560 V/ms to the full value which is held for 1 s to 4 s. 
NOTE 2 — A steepness of 1 560 V/ms corresponds to the st eepness of a sine-wave with a MAINS frequency of 60 Hz. 
During the test, MAINS SWITCHES and functional sw itches, if any, CONDUCTIVELY CONNECTED TO THE 
MAINS, should be in the ON-position and it should be secu red by suitable means so t hat the test voltage is 
completely effective. No flash-over or breakdown should occur during the te st. The test voltage source should 
be provided with a current sensing (over-current) device which, when activated, gives an indication that the 
test has been failed. The test voltage source should st ill deliver the prescribed voltage until current tripping 
occurs.  
NOTE 3 — The tripping current should not exceed 100 mA. 
NOTE 4 — Tripping of the current sensing device is regarded as a flashover or breakdown. US 662:2008 
© UNBS 2008 – All rights reserved  17
 D.1.8 Safety relevant markings on the outside of the apparatus 
The legibility of safety relevant markings on the outs ide of the apparatus, for example with regard to the 
supply voltage, should be checked by inspection.  
D.2 Mechanical strength 
D.2.1 Complete apparatus 
The apparatus shall have adequate mechanical strength and be so as to withstand such handling as may be 
expected during continued use. 
The apparatus shall be so constructed that short-ci rcuiting of insulations between HAZARDOUS LIVE parts 
and ACCESSIBLE conductive parts or parts conducti vely connected to those, for example by unintended 
loosening of screws, is prevented. 
Compliance, is checked by inspection 
D.2.2 Bump test 
Apparatus with a mass exceeding 7 kg are subjected to the test below. 
The apparatus is placed on a horizontal wooden support, which is allowed to fall 50 times from a height of 5 
cm onto a wooden table. 
After the test, the apparatus shall show no damage in the sense of this code. 
D.2.3 Vibration test 
TRANSPORTABLE APPARATUS intended to be used for a udio amplification of musical instruments, 
PORTABLE APPARATUS and apparatus having a metal encl osure, are subjected to  a vibration endurance 
conditioning by sweeping  
The apparatus is fastened in its intended positions of use to the vibration-generator by means of straps round 
the enclosure. The direction of vibration is vertical, and the severity is: 
• Duration   0 min 
• Amplitude   0.35 mm 
• Frequency range 10 Hz ... 55 Hz... 10 Hz 
• Sweep rate  approximately 1 octave/min 
After the test, the apparatus shall show no damage in the sense of this code, in particular, no connection or part the loosening of which might impair safety shall have loosened. 
D.2.4 Impact test 
The apparatus is held firmly against a rigid support and is subjected to three blows from a spring-operated 
impact hammer, applied with a kinetic energy just before impact of 0,5 J to every point of the enclosure that 
protects HAZARDOUS LIVE parts and is likely to be we ak, including ventilation areas, drawers in the pulled-
out position, handles, levers, switch knobs and the like, by pressing the release cone perpendicularly to the 
surface. US 662:2008 
18 © UNBS 2008 – All rights reserved
 This impact hammer test is also made on windows, lenses, signal lamps and their covers, etc., but only if they 
protrude from the enclosure by more than 5 mm or if the area of the plane projection of the individual surface 
area exceeds 1 cm2. 
Moreover, the non-ventilated solid areas of the enclo sure that protect HAZARDOUS LIVE parts shall be 
subjected to a single impact, specified in Table 5 
The impact specified in Table 5 shall be caused by a llowing a solid, smooth, steel ball of (50 ± 1) mm in 
diameter and with the mass of approximately 500 g to fall freely from rest through a vertical distance, as 
illustrated in Figure 1 below and strike the enclosure with  the specified impact in a direction perpendicular to 
the enclosure surface. 
Table 5 — Impact test on the enclosure of apparatus  
Enclosure part Impact, 
(Joules +1-1%) 
Top, sides, back, and front of PORTABLE APPARATUS 
or tabletop apparatus 2 
All exposed surfaces of fixed mounted apparatus 2 
Top, sides, back, and front of floor – standing apparatus 3.5 
NOTE To apply the required impact energy , the correct height is calculated by: 
 h = E/(gxm) 
where 
 h is the vertical distance in metres; 
 E is the impact energy in Joules; 
 g is the gravitational acceleration of 9.81 m/s2 ; and 
 m is the mass, in kilogr ams, of the steel ball. 
 
After the test, the apparatus shall withstand the dielectric strength test as specified in D.2.6 and shall show no 
damage in the sense of this coded in particular: 
• HAZARDOUS LIVE parts shall not have become ACCESSIBLE, 
• insulating barriers shall not have been damaged, 
• those parts subjected to the impact hamm er test shall show no visible cracks. 
NOTE Damage to the finish, small dents which do not  reduce CLEARANCES or CREEPAGE DISTANCES below the 
specified values, cracks which are not visi ble to the naked eye, surface cracks in fibre-reinforced moul dings and the like 
are ignored. US 662:2008 
© UNBS 2008 – All rights reserved  19
 
 
Figure 1 — Impact test using a steel ball 
 
D.2.5 Drop test 
PORTABLE APPARATUS HAVING a mass of 7 kg or less are subjected to a drop test. A sample of the 
complete apparatus is subjected to three impacts that result from being dropped through a distance of 1,0 m 
onto a horizontal surface in positions likely to produce the most adverse results. 
The horizontal surface consists of hardwood at leas t 13 mm thick, mounted on two layers of plywood each 19 
mm to 20 mm thick, all supported on a conc rete or equivalent non-resilient floor. 
For each drop, the test sample shall strike the surface in a different position. When applicable, the sample is 
to be dropped with the batteries specified by the manufacturer. 
Upon conclusion of the test, the apparatus need not be ope rational, but shall withstand the dielectric strength 
test as specified in D.2.6, under dielectric  and insulation resistance test, in particular; 
• HAZARDOUS LIVE parts shall not have become ACCESSIBLE, 
• insulating barriers shall not have been damaged, and  
• CLEARANCES and CREEPAGE DISTANCES shall not have been reduced. 
The test criteria shall not be applied through openings in the face of the picture tube.  
D.2.6 Insulation resistance and dielectric strength 
D.2.6.1 The insulation of the insulating materials shall be adequate. Compliance is checked in 
accordance with D.2.6.2 
NOTE In order to facilitate dielectric strength test ing, components and subassemblie s may be tested separately. 
D.2.6.2 The insulations listed in Table 6 shall be tested: US 662:2008 
20 © UNBS 2008 – All rights reserved
 i) for insulation resistance with 500 V d.c.; and 
ii) for dielectric strength as follows: 
• insulations stressed with d.c. voltage (R IPPLE FREE) are tested with a d.c. voltage; 
and 
• insulations stressed with a.c. voltage are tested with an a.c. voltage at MAINS 
frequency. 
However, where corona, ionization, charge effects or t he like may occur, a d.c. test voltage is recommended. 
NOTE 1 Where there are capacitors across the insulation un der test, it is recommended t hat d.c. test voltages are 
used. 
Test voltages shall be as specified in table 6 for the appropriate grade of insulation (BASIC, 
SUPPLEMENTARY or REINFORCED INSULATION) and for the OPERATING VOLTAGE V across the 
insulation. 
For the purpose of determining the OPERAT lNG VOLTAGE V, the following applies: 
a) the apparatus is fed by its RATED SUPPLY VOLTAGE; 
b) in case of a.c. voltages, the true peak value including periodic and non-periodic superimposed pulses 
with a half-value time longer than 50 ns shall be measured; 
c) in case of d.c. voltages, the peak value of any superimposed ripple shall be included; 
d) periodic and non-periodic transients with a half-va lue time not exceeding 50 ns shall be disregarded; 
e) unearthed ACCESSIBLE conductive parts shall be assumed to be connected to an ea rth TERMINAL 
or to a PROTECTIVE EARTHIN G TERMINAL or contact; 
f) where a transformer winding or other part is fl oating, that is, not connected to a circuit which 
establishes its potential relative to earth, it shall be assumed to be connected to an earth TERMINAL 
or to a PROTECTIVE EARTHING TERM INAL or contact at the point which results in the highest 
OPERA TING VOLTAGE being obtained; 
g) where DOUBLE INSULATION is used, the OPERATING VOLTAG E across the BASIC INSULATION 
shall be determined by imagining a short-circui t across the SUPPLEMENTARY INSULATION, and 
vice versa. For insulation between transformer windings, the short-circuit shall be assumed to take place at the point at which the highest O PERATING VOLTAGE is produced across the other 
insulation; 
h) for insulations between two transformer windings, the highest voltage between any two points in the 
two windings shall be used, taking into account external voltages to which the windings may be connected; and 
i) for insulations between a transformer winding and another part, the highest voltage between any point 
of the winding and the other part shall be used. 
The test voltages shall be obtained from a suitable so urce so designed that, when the output TERMINALS are 
short-circuited after the test voltage has been adjusted to the appropriate level, the output current is at least 
200 mA. 
An over-current device shall not trip wh en the output current is less than 100 mA. 
Care shall be taken that the value of the test voltage applied is measured within ± 3 %. US 662:2008 
© UNBS 2008 – All rights reserved  21
 Initially, not more than half of the prescribed test voltage is applied, then it is raised rapidly to the full value 
which is held for 1 min. 
The measurements of the insulation resistance and the dielectric strength tests are made in the humidity 
chamber, or in the room in which the apparatus wa s brought to the prescribed temperature, after the 
reassembly of those parts which may have been removed. 
The apparatus is deemed to comply with the requirement, if the insulation resistance measured after 1 min is 
not less than the values given in Table 6 and no flash-ov er or breakdown occurs during the dielectric strength 
test. 
When testing enclosures of insulating material, a me tal foil is pressed tightly against ACCESSIBLE parts. 
For apparatus incorporating both REIN FORCED INSULATlON and lower grades of insulation, care shall be 
taken that the voltage applied to the REINFORCED INSULATlON does not overstress BASIC or 
SUPPLEMENTARY INSULATION. 
NOTE 2 ACCESSIBLE conductive parts may be connec ted together during the di electric strength test. 
NOTE 3 An instrument to carry out the dielectric strength test on thin sheets of insulating material is described in 
Figure 2 below. 
 
Figure 1 — Dielectric strength test instrument 
NOTE 4 The test is not made on insulation the short-circuiti ng of which does not cause an y electric shock hazard, for 
example in the case where one end of a secondary wi nding of an ISOLATING TRANSFORMER is connected to an 
ACCESSIBLE conductive part, the other end need not meet any insulation re quirement with regard to the same 
ACCESSIBLE conductive part. US 662:2008 
22 © UNBS 2008 – All rights reserved
 Resistors, capacitors and RC-units comp lying with original manufacturers specified capacititors connected in 
parallel with the insulations to be tested, are disc onnected. Inductors and windi ngs which otherwise would 
prevent the test from being made, are also disconnected. 
Table 6 — Test voltages for dielectric strength test and values for insulation resistance 
Insulation Insulation resistance , 
MΩ AC test voltage (peak) or DC test voltage
Between parts of different polarity DIRECTLY 
CONNECTED TO THE MAINS. 2 For rated MAINS voltages :5:150 V (r.m.s.): 
1 410 V 
For rated MAINS voltages >150 V (r.m.s.): 
2 120 V 
Between parts separated by BASIC INSULATION or by SUPPLEMENTARY INSULATION. 
2  Curve A of Figure 3 
Between parts separated by REINFORCED INSULATION. 4  Curve B of Figure 3 
NOTE Curves A and B of Figure 3 ar e defined by the following points: 
Test voltage (peak) OPERATING VOLTAGE U 
(peak) 
Curve A Curve B 
 35 V 
354 V 
1 410 V 
10 kV 
>10 kV 707 V 
 
3 980 V 
15 kV 
1.5U V 1 410 V 
4 240 V 
 
15 kV 
1.5 U V  
 
 US 662:2008 
© UNBS 2008 – All rights reserved  23
 
 
 
Figure 2 — Test voltage US 662:2008 
24 © UNBS 2008 – All rights reserved
 Annex E 
(normative) 
 
Symbols used  
E.1 Instructions 
Where information with regard to safety is required acco rding to this code, this information shall have been 
given in an instruction for installation or use and supp lied with the apparatus. This information shall be in a 
language acceptable to the country where the apparatus is intended to be used. 
NOTE 1 The following information with regard to safety  is recommended to be included as far as applicable: 
a) minimum distances around the app aratus for sufficient ventilation; 
b) the ventilation should not be impeded by covering the ventilation openings with items, such as newspapers, 
table-cloths, curtains, etc.; 
c) no naked flame sources, such as lighted candles, should be placed on the apparatus; 
d) attention should be drawn to the envir onmental aspects of battery disposal; and 
e) the use of apparatus in trop ical and/or moderate climates. 
In addition, the instructions shall include the following as far as applicable. 
For MAINS powered apparatus and for apparatus producing internal voltages greater than 35 V (peak) a.c. or 
d.c., having no protection against splashing water, the inst ructions for use shall be that the apparatus shall not 
be exposed to dripping or spla shing and that no objects filled with liqui ds, such as vases, shall be placed on 
the apparatus. 
A warning that TERMINALS marked with the symbol according to annex C.2 (b) of this code are 
HAZARDOUS LIVE and that the external wiring connected to these TERMINALS requires installation by an 
INSTRUCTED PERSON or the use of ready-made leads or cords. 
If an apparatus is provided with a replaceable lithium battery, the following applies: 
• if the battery is intended to be replaced by the USER, there shall be a warning close to the battery or 
in both the instructions for us e and the service instructions; 
• if the battery is not intended to be replaced by the USER, there shall be a warning close to the battery 
or in the service instructions. 
This warning shall include the following or similar text: 
CAUTION 
Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type. 
A warning that an apparatus with CLASS I construction shall be connected to a MAINS socket outlet with a protective earthing connection. 
Instructions to ensure correct and safe installati on and interconnection of the apparatus in multimedia 
systems. US 662:2008 
© UNBS 2008 – All rights reserved  25
 f) If the apparatus is not tested to the stability requirement s of E.2 (a, b and c) below of this code of practice 
due to fastening in place, the following or similar text shall be marked on or provided with the apparatus: 
WARNING 
To prevent injury, this apparatus must be securely attached to the floor/wall in accordance with the installation 
instructions. 
E.2 Stability and mechanical hazards 
Apparatus having a mass of 7 kg or more shall have  adequate stability. In addition, the stability shall be 
ensured when legs, carts or stands supplied by the manufacturer are fitted. 
Compliance is checked by the tests of E.2 (a, b and c) 
Apparatus intended to be fastened in place are not required to be subjected to these tests if the marking of E.1 (f) is provided on or with the apparatus. 
The test of E.2 (c) is only required for 
• apparatus with a mass of 25 kg or more, or 
• apparatus with a height of 1 m or more, or 
• apparatus in combination with a supplied or recommended cart or stand with a total height of 1 m or 
more. 
During the tests, the appar atus shall not overturn. 
a) The apparatus, or apparatus in combination with a supplied or recommended cart or stand, is placed 
in its intended position of use on a plane, inclined  at an angle of 10° to the horizontal, and then rotated 
slowly through an angle of 360° about its normal vertical axis. 
All doors, drawers, casters, adjus table feet and other appurtenances are arranged in any combination 
that results in the least stability. The apparatus,  or apparatus in combination with a supplied or 
recommended cart or stand, shall be blocked, if necessary, by means of a stop of the smallest 
dimensions possible, to keep it from sliding or rolling. 
If, however, the apparatus, or appara tus in combination with a s upplied or recommended cart or 
stand, is such that, were it to be tilted through an angle of 10° when standing on a horizontal plane, a 
part of it not normally in contact with the suppo rting surface would touch the horizontal plane, the 
apparatus is placed on a horizontal support and the co mbination is tilted in the most unfavorable 
direction through an angle of 10°. 
NOTE The test on the horizontal support may be necessary, for example, for apparatus provided with small feet, casters or the like. 
b) The apparatus or apparatus in combination with a supplied or recommended cart or stand, is placed 
on a non-skid surface that is at an angle not exceedi ng 1° to the horizontal with lids, flaps, drawers, 
doors, casters, wheels, adjustabl e feet and other appurtenances in  the most unfavorable position. 
A force of 100 N directed vertically downwards is applied in such a way as to produce the maximum 
overturning moment, to any point of any horizontal surface, protrusion or re cess, provided that the 
distance from that point to the non -skid surface does not exceed 75 cm. 
c) The apparatus or apparatus in combination with  a supplied or recommended cart or stand is placed 
on a horizontal non-skid surface with lids, flaps, dr awers, doors, casters, wheels, adjustable feet and 
other appurtenances in the most unfavorable positi on, and externally applied horizontal force of 13 % US 662:2008 
26 © UNBS 2008 – All rights reserved
 of the weight of the apparatus or 100 N, whichever is less, is applied in a horizontal direction to that 
point on the apparatus that will result in the least stability and is not to be applied more than 1,5 m 
above floor level. If the apparatus or apparatus in  combination with a supplied or recommended cart 
or stand becomes unstable, it shall not overturn  at a tilt of less than 15° from the vertical. 
d) Edges or corners, except those required for proper apparatus functioning, shall be smoothed (no 
abrupt discontinuity) when they could otherwise be hazardous to the USER because of location or 
application in the apparatus. 
Compliance is checked by inspection. 
e) Glass, with the exception of picture tubes and laminated glass, with a surface area exceeding 0,1 m2 
or with a major dimension exceeding 450 mm, shall not be shattered in a manner likely to result in a 
skin-lacerating injury. 
Compliance is checked by the test of D.2.4 of this code 
If thereby the glass breaks or cracks, an additional test  according to E.2 (e) is made on a separate test 
sample. 
E.3 Fragmentation test 
The test sample is supported over its whole area and pr ecautions shall be taken to ensure that particles will 
not be scattered upon fragmentation. Then the test sa mple is shattered with a center punch placed 
approximately 15 mm in from the midpoint of one of the longer edges of the test sample. Within 5 min of 
fracture, and without using any aid to vision, except spec tacles if normally worn, the particles are counted in a 
square of 50 mm side located approximately at the center  of the area of coarsest fracture and excluding any 
area within 15 mm of any edge or hole. 
The test sample shall fragment in such a way that the number of particles counted in a square of 50 mm side 
shall not be less than 45. 
NOTE A suitable method of counting the particles is to place a square of 50 mm side of transparent material over the 
test sample and mark a spot of ink as each particle within the square is counted. To count  particles at the edges of the 
square, select any two adjacent  sides of the square and count all the particles  intersected by these, and exclude all other 
intersected particles. 
E.4 Wall or ceiling mounting means 
The mounting means of apparatus intended for wall or ceiling mounting shall be adequate. 
Compliance is checked by inspection of the constructi on and of available data, or where necessary, by the 
test below. The apparatus is mounted in accordance with  the manufacturer's instructions, a force in addition to 
the weight of the apparatus is applied downwards through t he centre of gravity, for 1 min. The additional force 
shall be equal to three times the weight of the ap paratus but not less than 50 N. The apparatus and its 
associated mounting means shall remain secure during the test. 
Compliance is checked by inspection. 
With regard to devices for disconnection from  the MAINS, instructio ns shall state that 
a) where the MAINS plug or an appliance coupler is used as the disconnect device, the disconnect 
device shall remain readily operable; 
b) where an all-pole MAINS SWITCH is used as the disconnect device, the location on the apparatus 
and the function of the switch shall be described, and the switch shall remain readily operable; and US 662:2008 
© UNBS 2008 – All rights reserved  27
 c) for PERMANENTLY CONNECTED APPARATUS prov ided neither with an all-pole MAINS SWITCH 
nor an all-pole circuit breaker, the installation sha ll be carried out in accordance with all applicable 
installation rules. 
Where marking, signal lamps or similar means might give the impression that the apparatus is completely 
disconnected from the MAINS, information that states clearly the correct situation shall be included. If symbols 
are used, their meaning shall also be explained. 
Marking of the off-position by the relevant symbol or lamps is permitted only for an all-pole MAINS SWITCH 
which interrupts all poles of the MAINS supply except the protective earthing conductor. 
Compliance is checked by inspection. 
E.5 Ionizing radiation 
Apparatus including a potential source of ionizing radiation shall be so co nstructed that personal protection 
against ionizing radiation is provided under normal operating conditions and under fault conditions. 
Compliance is checked by measurement under the following conditions. 
In addition to the normal operating conditions, all cont rols adjustable from the outside BY HAND, by any object 
such as a tool or a coin, and those internal adjustments or pre-sets which are not locked in a reliable manner, 
are adjusted so as to give maximum ra diation whilst maintaining an intelligib le picture for 1 h, at the end of 
which the measurement is made. 
NOTE 1 Soldered joints and paint lockings are examples of adequate locking. 
The exposure rate at any point outside the apparatus is determined by means of a radiation monitor with an 
effective area of 10 cm2, at a distance of 5 cm from the outer surface of the apparatus. 
Moreover, the measurement shall be made under fault conditions causing an increa se of the high-voltage, 
provided an intelligible picture is maintained for 1 h, at the end of which the measurement is made. 
The exposure rate shall not exceed 36 pA/kg (0.5 mR/h or 5 μSv/h). 
NOTE 2 The value is according to ICRP 15, clause 289 [22]. US 662:2008 
28 © UNBS 2008 – All rights reserved
 Bibliography 
IEC 60065,  Audio, video and similar electronics apparatus — Safety requirement 
 US 662: 2008 
© UNBS 2008 – All rights reserved  29
 Certification marking 
Products that conform to Uganda standards may be  marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is gove rned by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licens ed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in co njunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and  testing in accordance with the 
certification mark scheme of the Uganda National  Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of  licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 US 662: 2008 
 
ICS nn.nnn.nn 
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