scope:

This Standard specifies the var-hour meters for general use, namely, var-hour meters used in combination with instrument transformers, var-hour meters for summation measurement of multi circuits of the current composing system, transmitter-incorporating var-hour meters, and transmitter-incorporating var-hour meters for summation measurement of multi circuits of the current composing system, in three-phase three-wire system and three-phase four-wire system circuits (hereafter referred to as "meters"). For meters provided with auxiliary devices, this Standard shall be applied to the varhour meter units under such a condition that the auxiliary devices are attached.

This Standard applies the voltage and current with a waveform that is approximately sinusoidal.

This Standard is applied only to the meters equipped with the reversal preventing device or reverse measurement blocking device.