IEEE C37.20.7 PDF

MC switchgear is compartmentalized to isolate components such as instrumentation, main bus, and both incoming and outgoing connections with grounded metal barriers. Rated maximum voltage levels for metal-clad switchgear range from 4. MC switchgear also contains associated control, instruments, metering, relaying, protective, and regulating devices, as necessary. Service conditions, ratings, temperature limitations and classification of insulating materials, insulation dielectric withstand voltage requirements, test procedures, and applications are discussed.

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Full Description Scope This guide establishes methods by which equipment may be tested for resistance to the effects of arcing due to an internal fault. This guide applies only to equipment utilizing air as the primary insulating medium and rated 38 kV ac or below.

It applies to both indoor and outdoor equipment; however, special consideration must be given to the building size and construction for indoor applications not fully addressed by this document. The tests and assessments described in this guide are only applicable to arcing faults occurring entirely in air within the enclosure when doors and covers are properly secured in accordance with the rated Accessibility Type.

This guide does not apply to arcing faults that occur within components of the equipment, such as instrument transformers, sealed interrupting devices, fuses, and so on. Designs that meet the requirements of this guide are referred to as arc-resistant. Abstract Revision Standard - Inactive - Superseded. A procedure for testing and evaluating the performance of switchgear for internal arcing faults is covered. A method of identifying the capabilities of this equipment is given. Service conditions, installation, and application of equipment are also discussed.

As used in this document, the term "switchgear" is used as a general term covering switching and interrupting devices and their combination with associated control, instrumentation, metering, protective and regulating devices, assemblies of those devices with associated interconnections, accessories, and supporting structures used primarily in conjunction with the generation, transmission, distribution, and conversion of electrical power.

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Arc Resistant Switchgear

Full Description Scope This guide establishes methods by which equipment may be tested for resistance to the effects of arcing due to an internal fault. This guide applies only to equipment utilizing air as the primary insulating medium and rated 38 kV ac or below. It applies to both indoor and outdoor equipment; however, special consideration must be given to the building size and construction for indoor applications not fully addressed by this document. The tests and assessments described in this guide are only applicable to arcing faults occurring entirely in air within the enclosure when doors and covers are properly secured in accordance with the rated Accessibility Type. This guide does not apply to arcing faults that occur within components of the equipment, such as instrument transformers, sealed interrupting devices, fuses, and so on. Designs that meet the requirements of this guide are referred to as arc-resistant. Abstract Revision Standard - Inactive - Superseded.

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