JIS C 1216-1:2009 (R2014)

This Japanese Industrial Standard specifies the watt-hour meters for general use, namely, normal watt-hour meters, precision watt-hour meters, special precision watt-hour meters, precision watt-hour meters for summation measurement of multi circuits of the current composing system, transmitter-incorporating normal watt-hour meters, transmitter-incorporating precision watt-hour meters, transmitter-incorporating precision watt-hour meters for summation measurement of multi circuits of the current composing system, that are used in combination with instrument transformers in single-phase two-wire system, single-phase three-wire system, three-phase three-wire system and three-phase four-wire system circuits.