NEMA and CEMEP released a joint statement on the benefits of applying a system's approach to energy efficiency using IEC 61800-9-2.
More NEMA standard pdf
NEMA DC 5-1989 (R1996, R2002, R2008)
Residential Controls - Surface-Type Controls for Electric Storage Water Heaters
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NEMA XR 15-1991 (R1996, R2001)
Test Standard for the Determination of the Visible Entrance Field Size of an X-Ray Image Intensifier (XRII) System
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