Description: Class designations, voltage and frequency ratings, test-current values, internal wiring arrangements, pertinent dimensions, rotor markings, register requirements, and other general specifications are covered for both detachable and bottom-connected electromechanical watthour meters. Combination devices utilizing the essential elements of watthour meters are also covered insofar as their application is practicable. The terminal arrangements and mounting dimensions covered by this standard are essentially those adopted by the watthour meter industry from 1928 to 1936.
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