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IEEE C37.21-2005

Current Revision

IEEE Standard for Control Switchboards

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Revision Standard - Superseded. This standard covers ratings, construction, and testing of dead-front control switchboards containing but not limited to devices such as switches, control devices, instrumentation, metering, monitoring, alarms, annunciators, protective and auxiliary relays, and regulating devices and accessories. It includes, but is not specifically limited to, switchboards for the control and protection of apparatus used for or associated with power generation, conversion, transmission, and distribution. Types of switchboards may include control, vertical, dead-front, enclosed, dual, or duplex switchboards. Other construction types include control desks, consoles, benchboards, dual or duplex benchboards, fixed rack, cabinet, and swing rack cabinets. It does not apply to industrial controls, communication equipment, switchboards for use on board ships, or Class 1E switchboards for use in nuclear generating stations.
This standard covers ratings, construction, and testing of dead-front control switchboards containing but not limited to devices such as switches, control devices, instrumentation, metering, monitoring, protective and auxiliary relays, and regulating devices and accessories.
This project will modify all dimensional information to provide metric dimensions. This is necessary to gain global acceptance of this standard. Also, due to changes in related standards (e.g. C37.20.1 and C37.20.2) revisions will be made to provide similar requirements between these related standards.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C37.21
Publication Date Dec. 1, 2005
Language en - English
Page Count 34
Revision Level
Supercedes
Committee Switchgear
Publish Date Document Id Type View
Dec. 1, 2005 C37.21-2005 Revision
March 29, 1988 C37.21-1985 Revision