C37.51-1989 - American National Standard for Switchgear--Metal-Enclosed Low-Voltage AC Power- Circuit-Breaker Switchgear Assemblies--Conformance Test Procedures
Standard Details
This standard applies to metal-enclosed low-voltage power-circuit-breaker switchgear assemblies and covers the conformance test procedures for the basic switchgear section that includes the structure, circuit-breaker compartments, instrument compartments, buses, and internal connections (see American National Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear, ANSI/IEEE C37.20.1-1987 for assigned ratings and usual service conditions). This standard does not apply to installations under the exclusive control of electric utilities for the purposes of communication or metering or for the generation, control, transformation, transmission and distribution of electric energy located in buildings used exclusively by utilities for such purposes, or located outdoors on property owned or leased by the utility or on public highways, streets, roads, and the like, or located outdoors by established rights on private property. Low-voltage switchgear assemblies usually include control and instrumentation components that are unique for the application and are not individually evaluated under this standard. However, these components when utilized in circuits that obtain their energy from primary sources within the low-voltage switchgear shall be suitably protected as specified in 3.2. NOTE -- In this standard, the use of the term “low-voltage switchgear” shall be considered to mean “metal-enclosed low-voltage 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. This standard specifies the tests that shall be performed to demonstrate that the low-voltage switchgear being tested conforms with the ratings assigned to it in accordance with American National Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear, ANSI/IEEE C37.20.1-1987, and American National Standard for Switchgear -- Low-Voltage Power Circuit Breakers and AC Power Circuit Protectors -- Preferred Ratings, Related Requirements, and Application Recommendations, ANSI C37.16-1988.
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