NEMA – new standard for electrical submeters
The new standard ANSI/NEMA SM 31000-7-2021 measures the accuracy of current sensors.
The standard, part of the SM 31000 series, covers the metrological requirements and associated testing for current sensors used with electrical energy submeters to assess accuracy.
It applies to multiple sensor technologies with a variety of outputs. These sensors enable current measurement for AC and DC electrical submetering.
The standard applies to both indoor and outdoor applications and covers temporary and permanently installed sensors for AC and DC applications.
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An annex addresses voltage output current sensors for parallel applications.
The entire SM 31000 standards series is aimed to assist policymakers and facility managers as they expand the usage of electrical submeters in energy management applications by giving them confidence in quality measurement.
Other parts in the series are:
a. SM 31000-1 General Requirements
b. SM 31000-2 AC Active Energy Accuracy
c. SM 31000-4 Additional Measurements Accuracy
d. SM 31000-5 DC Energy Accuracy
e. SM 31000-6 Power Quality Measurements and Accuracy
f. SM 31000-8 Demand Metering
g. SM 31000-9 Field Testing
h. SM 31000-10 Voltage Sensor Accuracy
In addition to the requirements of SM 31000-7, products certified to this standard shall also meet the applicable requirements from the SM 31000 parts 1 and 2.
