IEEE C37.20.1A Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear
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IEEE C37.20.1A Document Information:
Title
Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear
The Institute of Electrical and Electronics Engineers, Inc.
Publication Date:
Sep 22, 2005
Scope:
This standard covers metal-enclosed low-voltage power circuit
breaker switchgear assemblies containing, but not limited to, such
devices as low-voltage power circuit breakers (fused or unfused);
other interrupting devices; switches, control, instrumentation, and
metering; and protective and regulating equipment.
This standard is concerned with enclosed, rather than open,
indoor and outdoor switchgear assemblies. It includes types of
equipment that are part of secondary unit substations. It does not
apply to equipment covered by industrial control standards,
communication switchboards, communication switching equipment,
switchboards for use on board ships, or dead-front distribution
switchboards.
In this standard, metal-enclosed low-voltage power circuit
breaker switchgear shall be called LV switchgear. For LV
ac switchgear, the voltage shall be 1000V or below; for LV dc
switchgear, the voltage shall be 3200V or below.
Keywords:
- circuit breaker
- control
- cumulative loading
- current transformers
- drawout
- indoor
- instrumentation
- load current-carrying
- metering
- outdoor
- protection
- stationary
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