Superseded Standard

IEEE C37.21-2005

IEEE Standard for Control Switchboards

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.

Sponsor Committee
PE/SWG - Switchgear
Learn More
Status
Superseded Standard
PAR Approval
1999-09-16
Superseded by
C37.21-2017
Superseding
C37.21-1985
Board Approval
2005-06-09
History
ANSI Approved:
2005-10-07
Published:
2005-12-01
Reaffirmed:
2010-12-08

Working Group Details

Society
IEEE Power and Energy Society
Learn More
Sponsor Committee
PE/SWG - Switchgear
Learn More
Working Group
SASC-WG_C37.21 - SASC - IEEE Standard for Control Switchboards
IEEE Program Manager
Ashley Moran
Contact
Working Group Chair
Dan Hrncir
No Active Projects

C37.21-2017

IEEE Standard for Control Switchboards

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 are covered in this standard. 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.

Learn More

C37.21a-2020

IEEE Standard for Control Switchboards--Amendment 1: Control and Secondary Circuits and Devices, and All Wiring

Requirements for control, secondary, and logic-level wiring are addressed in this amendment. It covers wire type, ampacity, and methods for protecting wiring across a hinge.

Learn More

No Superseded Standards
No Inactive-Withdrawn Standards
No Inactive-Reserved Standards
Newswire

Sign up for our monthly newsletter to learn about new developments, including resources, insights and more.