EDC1   (5240)  P3
     
 
 
 
 
 
 
DRAFT  TANZANIA  STANDARD  
 
(Draft for comments only)  
 
 
 
Mini-Grid Systems  –  
 
Part 8: Electricity  metering  minimum  accuracy  and  
environmental  requirements   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA  BUREAU  OF STANDARDS   
 
 
 
TBS  2017                                                                                                                                                                                         First Edition      
 
  
 Table   of  contents    
 
 
0.    Forward  .................................................. .............................................................................................1  
1.   Scope  ............................................................................................................................. .............. 1   
2.   Normative  references........................................................ ............................................... ........ 1   
3.   Service  conditions............................................................................................................ .............  2   
4.   Electrical  system  parameters  requirement  ................................................................... ......... 2   
5.   Accuracy  requirements................................................... ................................................. ......... 3   
6.   Power  consumption  of meter.......................................................................................... ..............  3   
7.   Design....................................................................................................................... ......... .............  3   
8.   Accuracy  requirement  tests........................................... ................................................. ..............  3   
9.   Data retention.................................................................................................................... .............  4   
10.   Display  functions  .......................................................................................................... .......... 4   
11.   Real-time clock  (RTC)  and calendar  .................. ......................................................... ......... 5   
12.   Battery............................................................................................. ............................................. 6   
13.   Anti-tampering/Ant -fraud  features.............................................................................. .............  6   
14.   Sample  testing................................................ ............................................................... ..............  6   
15.   Routine  testing.............................................................................................................. .............  6   
16.   Type  testing................................................................................................................... .............  7   
17.   Name  plate  information  and connection  diagram  .................................................... ..............  7   
18.   Annex  A.......................................................................................................................... .................  8
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 1.   Foreword    
 
This Draft  Tanzania  Standard  is part of an integrated  set of specifications  and standards   
issued  to govern  design  and construction  of mini-grid power  systems  in Tanzania.  This draft  
standard  aims at supporting  improved  residential,  commercial  and public  services  for rural  
communities  of Tanzania.  The mini-grid energy  systems,  when  properly  designed,  will support   
affordable  and reliable  energy  supply  for remote  households,  community  services,  commercial   
and economic  activities  including  shops,  workshops,  mic ro-industry,  fresh  water  pumping,   
secondary  schools,  health  services,  public  lightin g, places  of worship  or cultural  activities,   
agro-processing  activities  and other  activities.     
 
There  are many  existing  metering  standards,  including  pre-payment  standards,  but almost  all  
of  these   are  oriented   towards   large   scale   utility   operations   with  standard   customer   
interconnects  ranging  from 50 amps  to 200 amps  or more,  with load profile  reporting  and  
measuring  capabilities  consistent  with the needs  of such large  utilitie s.    
 
Rural  mini-grids  may include  consumers  who have  a total power  requirement  of an amp or  
less, and who may use only a fraction  of a kilowatt -hour per day.  In addition,  the power   
systems  themselves  may have  only a limited  amount  of energy  to supply,  so this may need  to  
be rationed  among  existing  customers.     
 
Mini-grid equipment  suppliers  have  developed  a number  of novel  m etering  systems  for use  
on mini-grids  with low load requirements.  Such  metering  systems  may incorporate  advanced   
prepayment  capabilities  such as limits  on daily energy  delivery  as well as on demand  and  
constitute  the leading  edge  of metering  technology.  However,  since  these  meters  are involved   
in financial  transactions,  it is very important  that the meters  measure  energy  (and potentially   
also power)  accurately  under  differing  environmental  and loading  conditions,  and that they be  
robust  to survive  wider  variations  of voltage  and frequency.     
 
It is recommended  that some  form of metering  be required  by the regulatory  authority  for all  
consumers  on all mini-grids.  This is because  of fairness  issues  (fewer  possible  complaints   
about  over or undercharging)  and also to enable  perfor mance  reporting  of system  losses.   If  
the operator  does not know  how much  energy  is purchased,  it is not possible  to assess  system   
losses.   
 
The intent  of this standard  is to allow  the development  of novel  or innovative  billing  strategies   
while  maintaining  confidence  in the devices  used  as meters.   Accordingly,  this standard  will  
not mandate  nor control  such items  as payment  strategies  , communications  protocols  or  
register  design.  This standard  will include.   
 
a)  Requirements  for an accuracy  standard  that is appropriate  to the reduced  power   
 levels  that are present  in these  systems  along  with a testing/certification  requirement.   
 
b)  Environmental/surge  withstands  requirements  to ensure  that the meters  are able to  
 operate  in the real world.   
 
c)  Minimum  requirements  for the deterrence/detection  and information  display  via  
 external  devices  such as text messages,  rather  than requiring  a display  register.   
 
 
 
 
 
 
iii   
 2.   Scope    
 
This standard  specifies  the minimum  level of functionality  requirements  for three  phase  or  
single  phase,  total current,  static  kilowatt -hour (kWh)  meters  to be installed  in distribution   
networks  of mini-grid systems.   
 
The provisions  of this standard  apply  to:  
 
a)  Three  phase  meters  intended  to measure  3 phase  4 wire, 230/400V,  50Hz  service   
 and to single  phase  meters  intended  to measure  1 phase  2 wire, 230V , 50 Hz  
 service.   
 
b)  Requirements  for accuracy,  testing,  as well as electromagnetic  compatibility,  and  
 surge  withstand  capability  requirements  of devices  used  as electricity  metering  for  
 three  phase  and single  phase  service.    
 
Note 1
 It is not within  the scope  of this standard  to mandate  or regulate  capabilities  for  
time of use (TOU)  metering,  smart  metering,  prepayment   metering,  communications   
methods  or protocols,  power  quality  data collection  or any capability  within  the realm   
commonly  referred  to as “advanced  metering”.    
 
Note  2
  This standard   shall be  read  in  conjunction  with  other   relevant   –Tanzania   
standards,  applicable  standards  and specifications  to have  uniformity,  compatibility  and  
standardization  in distribution  system.   
 
 
 
3.   Normative   references    
 
For  the  purpose   of  this  Tanzania   standard,   the  following   references   shall  apply:    
 
TZS  629:  2001 (1st Ed) Class  0.5, 1  and 2  alternating   current  watt-hour  meter  –  
 Specification   
 
IEC 62052 -11: Electricity  metering  equipment  (AC) -General  requirements,  tests and test  
 conditions  – Part 11: Metering  equipment   
 
IEC 62053  -21: Electricity  metering  equipment  (a.c.)  - Static  meters  for active  energy   
 (classes  1 and 2)  
 
IEC 62053  -23: Electricity  metering  equipment  (a.c.)  - Static  meters  for reactive  energy   
 (classes  2 and 3)  
 
IEC 62058 -11: Electricity  metering  equipment  (AC) - Acceptance  inspection  - Part 11:  
 General  acceptance  inspection  methods   
 
IEC 62058 -31: Electricity  metering  equipment  (AC) - Acceptance  inspection  - Part 31  
 Particular  requirements  for static  meters  for active  energy  (classes  0,2 S, 0,5 S, 1 and 2)  
 
IEC-60664 -1: Insulation  coordination  within  low voltage  system  including  clearances  and  
 creepage  distance  for equipment   
 
 
 
1   
 f)  2  
 Limit range  of temperature  for storage  and transportation:  -10°C  - +70°C   
g)  Coastal  areas  with high levels  of salt contamination   IEC-60068 -2-1: Environmental  Testing -Part 2-1: Tests -Test A: Cold  
 
IEC-60068 -2-2: Environmental  Testing -Part 2-2: Tests -Test B: Dry heat  
 
IEC-60529:  Degree  of Protection   
 
IEC 61000:  Electromagnetic  compatibility  (EMC)  Part- 2-2, 4-2, Part-4-3, 4-4, 4-5, 4-  
6, 4-8, 4-11, 4-12.  
 
IEC-60664:  Insulation  coordination  within  low voltage  system  including  clearance  and  
creepage  distance  for equipment   
 
EN 50470 -3: Electricity  metering  equipment  static  meters  for active  energy,  Classes   
A, B and C  
 
TANESCO   –Specification   S01:  Supply   and  Installation   of  Plant   and  
Equipment    
 
-  TANESCO   engineering   manuals    
 
In the event  of conflict  between  these  standards  and this specification,  this standard  shall  
govern.  It is the intent  of this standard  to regulate  only accuracy,  surge  withstand  capability   
and electromagnetic  compatibility,  and not to specify  constructional  details.     
 
 
4.   Service   conditions    
 
Electricity   metering   for  mini-grid  system   shall  be  designed   for  outdoor   service   under   
the  conditions   as  follows:    
 
a)  Altitude  above  mean  sea level (MSL):  Up to 3,000  meters   
b)  Maximum  ambient  temperature:  +40°C   
c)  Minimum  ambient  temperature:  0°C  
d)  High levels  of humidity  that promote  the growth  of fungi  
e)  Sun exposure  of 700 watts/m    
 
 
 
 
For  some   equipment   IEC  standards   specify   an  altitude   not  exceeding   1000   m  as  a  
normal   service   condition.     Altitudes   higher   than  1000   m  are  considered   as  abnormal    
service   conditions   and  may  require   special   considerations   in  the  design,   manufacture   
or  application   of  the  materials   or  equipment.     It  is  the  responsibility   of  the  proponent   to   
recognize   the  particular   conditions   occurring   on  any  site  and  call  them   to  the  attention   
of  the  manufacturer.    
 
 
5.   Electrical   system   parameters   requirement    
 
System   parameters   for  mini-grid  low  voltage   metering   of  single   phase   (230V)   and  
three   phase   (230/400V)   are  as  follows:    
 
a)  Normal  system  low voltage  (U): 230/400V  (±10%)   
b)  Maximum  high voltage  for meter  operation  voltag e (Um): 253/440V   
 
2   
 f)  c)  Minimum  low voltage  for meter  operation:  161/280V    
d)  System  frequency  range:  50 Hz (± 3Hz)  
e)  Neutral  grounding  arrangement:  system  neutral  is multi-grounded   
 
 
6.   Accuracy   requirements    
 
The  accuracy   requirements   of  metering   shall  be  as  follows:    
 
a)  Accuracy  Class:  1.0 for active  energy    
b)  Accuracy  Class:  2.0 for reactive  energy,  if this capability  is provided.   
 
 
7.   Power   consumption   of  meter    
 
a)  Power  consumption  of meter  in voltage  circuit  including  power  supply -per phase  (at  
 reference  voltage):  ≤ 2.0 watts  and ≤ 10VA   
b)  Power  consumption  of meter  in current  circuit  at basic  current -per circuit:  ≤ 4VA  
c)  The meter  shall have  a protective  circuit  to protect  itself against  any electric  trouble   
 and electromagnetic  interference  from other  devices  connected  to the meter  through   
 interface  such as communication  port and power  cable   
 
 
8.   Design      
 
Electricity   metering   for  mini-grid  system   shall  be  designed   to  comply   with  the  following   
mandatory   capabilities:    
 
a)  Maximum  temperature  rise of external  surfaces:  +25°C  with ambient  temperature  of  
 +50°C   
b)  Rated  Impulse  voltage  withstand  (BIL):6  kV, for a wave  shape  of 1.2 / 50 µsec  
c)  Power  frequency  withstand  voltage  for 1 minute:  4kV applied  between  voltage  and  
 current  circuits  tied together  and earth   
d)  Short  time over current:  30xI max.  with tolerance  of 0 to 10% for ½ cycle.   
d)  Minimum  Creepage  distance:  10mm  minimum   
e)  Operating  voltage  range  within  which  meter  will maintain  specified  accuracy  class:   
 From  - 40% to +15%  of reference  voltage  range  (U)  
 Basic  or test current  for single  and three  phase  meters  is not regulated,   but is  
 recommended  to be 5amps.   
g)  Ratio  of maximum  allowable  current  to basic  current  (Imax/Ib): 4 or greater    
h)  Temperature  rise of terminal:  +30°C  with ambient  temperature  of +50°C   
i)  
j)  Compliance  with electromagnetic  compatibility  standard  IEC 61000.   
Meters  shall be of Protective  Class  II per IEC 62052 -11, which  specifies  that “protection   
against  electric  shock  does  not rely on basic  insulation  only, but includes  additional   
safety  precautions  such as double  insulation  or reinforced  insulation”.     
 
 
9.   Accuracy   requirement   tests    
 
a)  Every  energy  meter  shall be calibrated  for limits  of error to influence  quantities  under   
 reference  conditions  shall comply:  IEC 62053 -21 for active  energy  and IEC 62053 -23  
 reactive  energy.   
 
 
 
 
3   
 
    Number   b)  The accuracy  class  of energy  meter  shall comply:  Class  1.0 for active  energy  and  
 Class  2.0 for reactive  energy,  if this capability  is provided.   
 
c)  Limits  of error due to influence  quantities  under  reference  conditions  shall comply:  IEC  
 62053 -21 and IEC 62053 -23.  
 
d)  The energy  meter  shall be normally  functional  within  5 seconds  after the reference   
 voltage  is applied  to the meter  terminals.   
 
e)  When  the voltage  equal  to 115%  of the reference  voltage  is applied  for the specified   
 period  with no current  flowing  in the current  circuit,  the test output  of the meter  shall  
 not produce  more than one pulse.   
 
f)   
Energy  meter  calibration  shall provide  wide dynamic  range  and high stability  over the  
specified  operating  temperature  range  of the meter.   
 
 
10.  Data  retention    
 
a)  All programmed/configured  data shall be retained  in a non-volatile  memory.  The meter   
 shall employ  a memory  that offers  a minimum  of 5 years  of critical  configuration  data  
 retention.   
 
b)  The meter  memory  shall also be used  to record  the minimum  following  security  data  
 that may be displayed/read  through  the communication  port on request.   
 
   
Unique  serial  number  of the meter  as indicated  in the nameplate,  which  shall  
not be changed  or erased    
 of times  the meter  has been  configured   
    Date and time of last configuration   
  Number  of times  the meter  has been  de-energized   
  Date and time of last de-energization   
  
  
  
  
  
  
  
   Number  of resets   
 Date and time of last reset   
 Date of battery  installed   
 Date and time of battery  failure   
 Date and time of last reverse  run  
 Date and time of last phase  loss  
 Date and time clock  change  (time  and date)   
Date and time of calendar  change  (tariff,  TOU etc.)  
 
c)  Registers  data may be written  into the memory  at least once  per day, and whenever   
 power  failure occurs.   
 
 
11.  Display   functions    
 
a)  No display  is mandatory  but if one is supplied,  it shall comply  with the requirements   
 of this part.  The term “display”,  for purposes  of this standard  refers  to a visually   
 readable  output  unit that is intended  to be installed  outdoors  either  integrated  with  
 the meter  or located  nearby,  but otherwise  exposed  to outdoor  environmental   
 conditions.   Similar  visual  readout  devices  that are intended  to be installed  indoors   
 are not covered  by this part.  
 
 
4   
 b)  A display  is not mandatory,  but if there  is none  then customers  shall be able to access   
 meter  reading  data in some  way.  
 
c)  If provided,  a display  shall be high contrast,  UV protected  and easy -to-read multi-  
 segment  liquid  crystal  display  (LCD).   
 
d)  The LCD shall be able to withstand  environmental   conditions  as specified  in this  
 standard.  The LCD shall not have any change  in color,  contrast,  brightness  and in any  
 other  feature  during  entire  meter  life period.  The temperature  limit of LCD is the same   
 as that of the meter.  The quality  of LCD shall not degrade  due to solar radiat ion.  
 
e)  The display  shall have  access  to all the metering  parameters  and shall be tailored  to  
 display  only the required  information  by masking -out undesired  information.   
 
f)   
The display  shall have  an anomaly  indicator  flash to indicate,  when  there  is failure  in  
the electronic  components,  overflow  in calculation  and/or  any other  error which  results   
in meter  malfunction  and/or  any tampering  with meter  or a missing  phase  or neutral.   
 
g)  The display  shall have  a reverse  direction  indicator  flash to indicate  when  the active   
 energy  in any of phase  is flowing  in the reverse  direction.  Alternately,  a four-quadrant   
 indicator  is also acceptable  provided  it shall blink when  measured  active energy  in one  
 or more  of the phases  is in the reverse  direction.   
 
h)  A battery  low indicator  flashes  or blinks  when  the battery  requires  replacement.  Meter   
 shall indicate,  when  remaining  battery  life is less than or equal  to 25%.   
 
i)   
All data shall automatically,  under  control  of the meter  internal  clock,  be noted  with a  
time stamp.   
 
 
12.  Real-time  lock  (RTC)   and  calendar    
 
a)  The meter  clock  used  for controlling  measurements  shall be a quartz  controlled  real  
 time clock/calendar  which  shall generate  signals  measurement  of kWh and kW, as well  
 as for the switching  of various  tariffs,  automatic  reset  and integration  period  for demand   
 and load curves.  The RTC may be used  to facilitate  time and date based  energy  rate  
 switching,  interval  measurement  and time stamping  of events,  logs and alarms.   
 
b)  Software  clocks  commonly  used  for computer  timing  are not acceptable  for meter   
 measurement  control.   
 
c)  The clock  shall use the notation  00:00  to 23:59.  The calendar  shall be correct  for meter   
 service  life and automatically  cater  for leap year.  
 
d)  When  the time of the Real-Time  Clock  (RTC)  is changed,  both the time before  change   
 and after changed  shall be stored.   
 
 
 
 
 
 
 
 
 
 
5   
 13.  Battery      
 
a)  A suitable  battery  or super  capacitor  shall support  the real-time clock  and event/alarm   
 logging  in the event  of power  failure.  The battery  should  assure  long life continuous   
 operation  and one year continuous  operation  without  AC power.  The shelf-life time of  
 the battery  shall be more  than 5 years.   
 
b)  In case of battery  low/failure,  the battery  low/failure  indicator  in the display  shall be  
 flashed  or blinked.   
 
 
14.  Anti-tampering/Ant -fraud   features    
 
The  meter  shall  have   anti-tampering   and  anti-fraud   functions  that  have   indication   and  
registration  locally  in the meter.  The exact  nature  of the anti-tampering/anti -fraud  features  is  
subject  to agreement  between  the purchaser  and the supplier , but the following  elements  are  
recommended  to be included  in the capability:   
 
a)  In case  of tampering  or opening  meter  security  box, meter  shall display  anomaly   
 indication  on LCD.   
 
b)  Meter  shall record  energy  consumption  in the absence  of neutral  wire as long as phase   
 wire is connected  to the phase  terminal  or to the neutral  of the meter.  In this case the  
 energy  recording  shall start when  a minimum  of 10% of basic  current  flows  through  the  
 phase  wire. In such case the energy  recording  shall be based  on the current  flowing   
 through  the meter  with assumed  voltage  and power  factor.   
 
c)  The meter shall be capable  of recording  energy  accurately  in case of change  of phase   
 with neutral  or missing  one or more  phase  and /or neutral.   
 
d)  The meter  shall record  number  of magnetic  attack  events,  record  date,  time and  
 duration  of last 10 magnetic  attacks.   
 
 
15.  Sample   testing    
 
a)  Testing  (acceptance  and rejection)  shall be as per IEC-62053 -26.  
 
b)  Testing  (acceptance  and rejection)  shall comply:  IEC-62053 -21 and IEC62053 -23.  
 Factory  acceptance  tests (FAT)  will be carried  out on random  samples  before   
acceptance  of meters.   
 
 
16.  Routine   testing    
 
Every  energy  meter  that is delivered  shall be routine  tested  for satisfactory  performan ce and  
to comply  with accuracy  class  in accordance  with IEC 62053 -21.   
 
 
 
 
 
 
 
 
 
 
6   
 i)  f)  17.  Type   testing    
 
The  offered   meters   shall  be  type  tested   and  shall  have  passed   the  tests  specified   in  
Annex   A.    Tests   may  be  performed   at  Tanzania   Bureau   of  Standards   or  an  accredited    
independent   testing   laboratory   within   the  five  years   prior  to  supply.    
 
 
18.  Name   plate   information   and  connection   diagram    
 
Every    energy    meter   shall   be  provided   with   a  suitably    sized   nameplate    containing   
information   specified   below.   Information    on  this  nameplate   shall  be  in  English.    
 
a)  The Manufacturer’s  name  or trademark,  place  and country  of origin   
b)  The number  of phases  and the number  of wires  for which  the meter  is desig ned  
c)  Manufacturer  unique  serial  number   
d)  Year of manufacture   
e)  The reference  voltage  in the form of the nominal  voltage  of the system  to which   
 the meter  is to be connected   
 The basic  current  (Ib) and the rated  maximum  current  (Imax) Amps   
g)  The reference  frequency   
h)  The metrology  constant:  in the form Imp/kWh  and Imp/kVA rh  
 The accuracy  class  index  of the meter   
j)   Appropriate   symbols  identifying   insulation   class,  measuring  elements  and  
 other  relevant  characteristics   
k)  The meter  connection  diagram  shall be indelibly  marked  on every  meter   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
7   
                                                                                                                   Annex   A   
 
(informative)   
 
 
      Applicable   IEC  Reference   Standards   for  Energy   Meters   Testing      
 
Tests   of  Insulation   Properties    
Impulse  voltage  tests  7.3.2  of IEC 62052 -11   
AC voltage  tests   7.3.3  of IEC 62052 -11   
Tests   of  accuracy   requirements    
Test of meter  constant    8.4 of IEC 62053 -21   
Test of starting  condition   8.3.3  of IEC 62053 -21   
Test of no-load condition   8.3.2  of IEC 62053 -21   
Test of error due to influence  quantities    8.2 of IEC 62053 -21   
Test of error due to variation  of the current   8.1 of IEC 62053 -21   
Accuracy  tests at reference  conditions    8.1 of EN50470 -3   
Repeatability   8.2 of EN50470 -3   
Variation  of the error due to variation  of the voltage    8.2 of IEC 62053 -22   
Variation  of the error due to variation  of the frequency    8.2 of IEC 62053 -22   
Variation  of the error due to variation  of the temperature    8.2 of IEC 62053 -22   
Maximum  permissible  error   8.4 of EN50470 -3   
Tests   of  electrical   requirements    
Test of power  consumption    7.1 of 62053 -21   
 
Test of influence  of supply  voltage     
7.1 of 62052 -11   
 
Test of influence  of short -time over-currents     
7.2 of 62053 -21   
 
Test of influence  of self-heating     
7.3 of 62053 -21   
 
Test of influence  of heating     
7.2 of 62052 -11   
 
Test of immunity  to earth  fault    
7.4 of 62052 -11   
 
Tests   for  electromagnetic   compatibility   (EMC)    
Radio  interference  suppression    7.5.8  of IEC 62052 -11   
Fast transient  burst  test   7.5.4  of IEC 62052 -11   
Damped  oscillatory  waves  immunity  test   7.5.7  of IEC 62052 -1   
 
Test of immunity  to electromagnetic  RF fields     
7.5.3  of IEC 62052 -11   
 
 
 
 
8   
 Test of immunity  to conducted  disturbances,  induced  by radio -  
frequency  fields    7.5.5  of IEC 62052 -1   
Test of immunity  to electrostatic  discharges    7.5.2  of IEC 62052 -11   
 
Surge  immunity  test    
7.5.6  of IEC 62052 -11   
Electromagnetic  compatibility  (EMC)  - Part 4-2: Testing  and  
measurement  techniques  - Electrostatic  discharge  immunity  test  IEC 61000 -4-2  
 
Electromagnetic  compatibility  (EMC)  - Part 4-3: Testing  and  
measurement  techniques  - Radiated,  radio  frequency,   
electromagnetic  field immunity  test   
IEC 61000 -4-3  
Electromagnetic  compatibility  (EMC)  - Part 4-4: Testing  and  
measurement  techniques  - Electrical  fast transient/burst  immunity   
test  IEC 61000 -4-4  
 
Electromagnetic  compatibility  (EMC)  - Part 4-5: Testing  and  
measurement  techniq ues - Surge  immunity  test   
IEC 61000 -4-5  
 
Electromagnetic  compatibility  (EMC)  - Part 4-6: Testing  and  
measurement  techniques  - Immunity  to conducted  disturbances,   
induced  by radio -frequency  fields    
IEC 61000 -4-6  
 
Electromagnetic  compatibility  (EMC)  - Part 4-8: Testing  and  
measurement  techniques  - Power  frequency  magnetic  field  
immunity  test   
IEC 61000 -4-8  
Electromagnetic  compatibility  (EMC)  - Part 4-11:  Testing   
and measurement  techniques  - Voltage  dips, short  interruptions   
and voltage  variations  immunity  test  IEC 61000 -4-11  
 
Tests   of  the  effect   of  the  climatic   environments    
 
Solar  radiation  test   
6.3.4  of IEC 62052 -11   
Dry heat test  6.3.1  of IEC 62052 -11  
Cold test  6.3.2  of IEC 62052 -11  
Damp  heat,  cyclic  test  6.3.3  of IEC 62052 -11  
Mechanical   tests    
Vibration  test  5.2.2.3  of IEC 62052 -11   
Shock  test   5.2.2.2  of IEC 62052 -11  
Spring  hammer  test   5.2.2.1  of IEC 62052 -11   
Tests  of protection  against  penetration  of dust and water    5.9 of IEC 62052 -11   
Test of resistance  to heat and fire  5.8 of IEC 62052 -11   
 
 
 
 
 
 
 
 
 
 
9