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ANSI C12.5 1978 Edition, January 1, 1978
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Thermal Demand Meters
Includes all amendments and changes through Reaffirmation Notice , 2012
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ANSI/NEMA MW 1000, 2014
This standard covers the class designations, voltage and frequency ratings, scale values, demand intervals, multiplying constants, mounting dimensions, terminal arrangements, and other features of general-service-type thermal watt demand meters and watthour-thermal watt demand meters. Although this standard specifically refers to watt demand meters, it is suggested that ampere and volt-ampere demand meters follow the applicable requirements so far as practicable.