NEMA C37.51-2018 PDF

Scope: "This Standard is a conformance testing Standard optionally applicable to all metal-enclosed low-voltage ac power circuit breaker switchgear assemblies designed@ tested@ and manufactured in accordance with IEEE Std C37.20.1@ Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear. This Standard covers selected tests to demonstrate conformance of the basic switchgear section (which includes the structure@ circuit breaker compartments@ instrument compartments@ buses@ and internal connections) with the ??Tests?? clause of IEEE Std C37.20.1. See IEEE Std C37.20.1 for assigned ratings and usual service conditions. In this Standard@ the use of the term ""LV switchgear"" shall be considered to mean ""metal-enclosed lowvoltage alternating current power circuit breaker switchgear assemblies."" The use of the term ""circuit breaker"" shall be considered to mean ""low-voltage alternating current power circuit breaker@"" unless qualified by other descriptive terms. Purpose This Standard specifies the tests that shall be performed to demonstrate that the LV switchgear being tested conforms with the ratings assigned to it and meets the mechanical and electrical performance requirements specified in IEEE Std C37.20.1."

NEMA C37.51-2018 history

2018 NEMA C37.51-2018 Switchgear — Metal-Enclosed Low Voltage AC Power Circuit Breaker Switchgear Assemblies — Conformance Test Procedures
2003 NEMA C37.51-2003 For Switchgear - Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies-Conformance Test Procedures (Incorporates Errata: February 2011)
1989 NEMA C37.51-1989 Switchgear Metal Enclosed Low Voltage AC Power Circuit Breaker Switchgear Assemblies - Conformance Test Procedure