JIS C 1283:1979

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This Japanese Industrial Standard specifies separate type indicators and multi-circuit summation indicators, hereinafter referred to as the \"indicators\", which indicate watt-hour, var-hour and maximum demand by receiving pulses transmitted from watt-hour meters with transmitter and var-hour meters with transmitter which are to be combined with instrument transformers in circuits of three-phase 3-wire system and three-phase 4-wire system. The requirements other than specified in this standard are as given in JIS C 1210. This standard applies to totalizing metering of addition only in the multi-circuit summation indicators. In this standard, the permissible limits of indication error and overall indication error due to the driving device and combination of driving device and instrument transformer are specified in Appendix 1 and watt-hour indicators for centralized metering system are specified in Appendix 2.