Project Details
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 nominal system voltage shall be 1000 Vac or below; for LV dc
switchgear, the rated maximum voltage shall be 3200 Vdc or below.
| Sponsor Committee | |
| Par Approval |
2020-12-03
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| Pars |
Additional Resources Details
| Historical Base Standard |
Working Group Details
| Working Group |
SASC-WG 37.20.1 - SASC - 37.20.1 - IEEE Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear
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| Sponsor Committee | |
| Society | |
| IEEE Program Manager | |
| Existing Standards |
Metal-enclosed, low-voltage switchgear?which contains either stationary or drawout, manually or electrically operated low-voltage ac or dc power circuit breakers in individual metal compartments, in three-pole, four-pole, two-pole, or single-pole construction?is covered. Rated maximum voltage levels are 254 V, 508 V, 635 V, 730 V, or 1058 Vac; and 300/325 V, 600 V, 800 V, 1000 V, 1200 V, 1500 V, 1600 V, or 3200 Vdc. The preferred continuous current ratings of the main bus in ac designs are 1600 A, 2000 A, 3000 A, 3200 A, 4000 A, 5000 A, 6000 A, 8000 A, or 10 000 A. For dc designs, the preferred ratings are 1600 A, 2000 A, 2500 A, 3000 A, 4000 A, 5000 A, 6000 A, 8000 A, 10 000 A, or 12 000 A. The switchgear may also contain associated control, instruments, metering, protective, and regulating devices as necessary. The standard deals with service conditions, ratings, temperature limitations, and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application.
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