NEMA C12.10
NEMA C1210 2011-JAN-01 Physcal Aspects of Watthour Meters - Safety Standard
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This standard covers the physical aspects of both detachable and bottom-connected watthour meters and associated registers. These include ratings, internal wiring arrangements, pertinent dimensions, markings, and other general specifications. Refer to the latest version of ANSI C12.1 and ANSI C12.20 for performance requirements.