National Electrical Installation Standards

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National Electrical Manufacturers Association (NEMA)

The National Electrical Manufacturers Association (NEMA) published NEMA ESM1-1 2019 Electrical Submeter—General Requirements and NEMA ESM1-2 2019 Electrical Submeter—Active Energy Accuracy. NEMA ESM1-1 covers general metrological requirements (accuracy) and associated testing for electrical energy submeters detailing energy use. NEMA ESM1-2 covers metrological requirements and associated testing for AC meters rated at not more than 1,000 V that measure active energy used in electrical energy submetering applications.

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