This standard (Part VIII ) applies to single-phase 2-wire wholecurrent watthour meters of an accuracy class 1·0.
1.2 It does not apply to:
a) single-phase whole-current meters which are covered by IS : 722 ( Part II/Sec 1 )-I962* and IS : 722 ( Part II/Sec 2 )-1969〓, and
b) single-phase tansformer-operated meters which are covered by IS:722(Part III)-1966〓.
IS 722 Pt.8-1972 history
1972IS 722 Pt.8-1972 Specification for alternating current meters Part Ⅷ Single-phase 2-wire full current wattmeter (Class 1.0)