NEMA - SM 31000-1
Electrical Submeter—General Requirements
|Publication Date:||1 January 2021|
This part, SM31000-1, specifies general requirements of the SM31000 Standard, which covers metrological requirements and associated testing for electrical energy submeters. The Standard applies to direct meters or metering systems comprising meters and associated sensors. These meters provide details of energy use for energy monitoring or revenue submetering.
The Standard does not apply to primary utility-owned meters.
The Standard applies to AC and DC kilowatt-hour meters, demand meters, load survey meters, power quality meters, single- and four-quadrant meters, etc.
The Standard applies to indoor and outdoor applications, portable, permanently installed, and embedded meters.
The Standard applies to AC meters rated at not more than 1000 V that measure active energy, apparent energy, and reactive energy (capacitive, inductive, and/or total), including received, delivered, and/or net, and also those measuring current, voltage, active power, apparent power, reactive power (capacitive, inductive, and/or total), power factor, phase angle, polarity, and frequency when measured in addition to energy.
The Standard also applies to DC meters rated not more than 1500 V that measure energy received, delivered, and/or net and also those that include additional measurement of power, current, and voltage.
The SM31000 Standard is broken into the following parts:
a. SM31000-1 General Requirements
b. SM31000-2 AC Active Energy Accuracy
c. SM31000-3 Revenue Submetering Requirements
d. SM31000-4 Additional Measurements Accuracy
e. SM31000-5 DC Energy Accuracy
f. SM31000-6 Power Quality Measurements and Accuracy
g. SM31000-7 Current Sensor Accuracy
h. SM31000-8 Demand Metering
i. SM31000-9 Field Testing