IEEE C37.21-2005
IEEE Standard for Control Switchboards
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- Language: English
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About This Item
IEEE C37.21-2005 is the standard for control switchboards used in power, energy, and related industrial applications. It addresses the technical requirements that help define how these switchboards are arranged, built, and evaluated for service in electrical systems. By setting clear expectations for construction and performance, it supports safer operation, more consistent procurement, and better alignment between equipment design and project requirements.
Overview of IEEE C37.21-2005
This standard focuses on control switchboards, a key component in electrical control and distribution environments. IEEE C37.21-2005 provides a framework for the technical characteristics that matter when specifying or reviewing this type of equipment, including construction considerations and expected service behavior. For engineering teams and buyers, it serves as a reference point for comparing products and confirming that switchboard designs match the intended application and operating conditions.
Typical use cases
IEEE C37.21-2005 is commonly relevant when selecting or specifying control switchboards for utility facilities, industrial power systems, and other installations that rely on centralized electrical control. It may be used during equipment procurement, project engineering, and specification review for switchboards that support control, monitoring, and switching functions. The standard is especially useful where consistent layout, dependable operation, and compatibility with broader power system requirements are important.
Why it matters
In practice, IEEE C37.21-2005 helps reduce uncertainty around how control switchboards should be designed and evaluated. That can support safer installations, clearer purchasing decisions, and more consistent engineering outcomes across projects. For organizations working in power and energy applications, the standard can also assist with compliance efforts, testing expectations, and risk reduction by giving stakeholders a shared technical basis for acceptance and review.
- Control switchboard technical requirements
- Power and industrial application context
- Construction and performance reference
- Specification and procurement support
- Superseded IEEE standard
- Publication Date: 2005
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C37.21 (2020)
- Previous Version: C37.21 (2017)
- This Version: C37.21 (2005)
- Previous Version: C37.21 (1988)
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