IEEE C37.21-2017
IEEE Standard for Control Switchboards
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- Language: English
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About This Item
IEEE C37.21-2017 is the standard for control switchboards, providing technical requirements that help define how these assemblies are designed and used in power, energy, and industrial applications. It addresses the control-side hardware and arrangement needed to support reliable operation, functional consistency, and safer integration of circuits and devices. For organizations specifying or purchasing switchboard equipment, this standard helps align expectations for construction and performance.
IEEE C37.21-2017 overview
This technical document focuses on control switchboards used in electrical systems where dependable circuit control and operator interface are important. IEEE C37.21-2017 is relevant to the design and evaluation of switchboard assemblies that bring together components, wiring, and devices in a coordinated layout. It is commonly used as a reference when defining requirements for enclosure arrangement, electrical characteristics, and general engineering practice in control equipment for power-related installations.
Typical use cases
This standard is typically used when specifying control switchboards for utility, industrial, and large facility power systems. It may guide the selection and arrangement of devices used for monitoring, switching, and control functions in substations, plant electrical rooms, and distribution areas. Engineers, buyers, and integrators may rely on IEEE C37.21-2017 when comparing equipment proposals, checking compatibility with project requirements, or documenting the expected construction and function of a switchboard assembly.
Why this standard matters
IEEE C37.21-2017 matters because control switchboards affect how electrical systems are operated, maintained, and protected. Clear requirements support more consistent design choices, better procurement decisions, and more reliable performance across similar installations. The standard can also help reduce ambiguity during testing, inspection, and acceptance by giving stakeholders a common technical reference. In practice, that can lower project risk and improve coordination between engineering, manufacturing, and end users.
- Control switchboard requirements
- Electrical component arrangement
- Power and industrial applications
- Design and procurement reference
- Performance and consistency checkpoints
- Publication Date: 2017
- Standard Status: Active
- Publisher: IEEE
- Subject: Components, Circuits, Devices and Systems; Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C37.21 (2020)
- This Version: C37.21 (2017)
- Previous Version: C37.21 (2005)
- Previous Version: C37.21 (1988)
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