ICS 17.220.20                         ETD 13

Reaffirmed 2017

1. Scope

1.1 This standard applies only to induction type watthour meters of accuracy Class 0.5,1 and 2, for the measurement of alternating current electrical active energy.

1.2 It applies to the assembly of meters and accessories, including current transformers, when enclosed in the meter case. It does not apply to maximum demand indicators which is covered by IS 8530.

1.3 It does not apply to any kind of measuring devices such as those used for telemetering electrical energy covered by IS 14451 ( Part 1 ).

1.4 This standard applies to multi-rate meters, but does not apply to other special types of meters ( for example, excess consumption meters ), or to meters used for testing purposes covered by IS 11426.

1.5 It does not apply to watthour meters where the voltage across the connection terminals exceeds 600 V ( line to line voltage for meters for polyphase systems ).

NOTE - For portable meters and meters for outdoor use, additionalrequirementsmaybe necessary

2. Referenced Documents

2.1 The Indian Standards listed in Annex B are necessary adjuncts to this standard.