February 18, 2020
ROSSLYN, Va.—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.
"In
developing the first Standards for metrological certification of electrical
submeters, NEMA started from the basics of ANSI C12 Standards governing utility
meters and created specifications exclusively for electrical submetering
applications,” said Henry Alton of Triacta Power Solutions and Chair of the NEMA
Electrical Submeter Section. “These new Standards cover accuracy requirements
for active energy as well as environmental performance requirements. Using a
wealth of industry experience, the NEMA Electrical Submeter Section spent three
years creating these performance specifications monitoring electrical energy.”
“These Standards apply to
stand-alone meters and metering systems comprised of meters, associated sensors,
and communications accessories,” added Alton. “ESM1 requirements are written in
a concise, self-contained fashion. Electric submeters designed and built to
meet ESM1 specifications can be used with confidence that they meet the
accuracy requirements of today's data-driven environment.”
These Standards are designed
to be used by professional engineering firms as well as local, state, and federal
regulators.