IEEE C57.12.51-1981
Voltage 208Y/120 to 4160 Volts
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About This Item
C57.12.51-1981 is a technical standard covering voltage levels from 208Y/120 to 4160 volts for power, energy, and industry applications. It is relevant where equipment and system requirements must be aligned to specific distribution voltages and operating conditions. For engineers, procurement teams, and compliance reviews, this specification helps define a consistent basis for design, rating, and acceptance decisions in electrical installations and related equipment selection.
C57.12.51-1981 overview
C57.12.51-1981 addresses the technical framework associated with electrical equipment or systems intended for the stated voltage range, typically used in power and industrial environments. The standard provides a defined reference for evaluating whether products or installations are suitable for service at 208Y/120 through 4160 volts. In practice, that makes C57.12.51-1981 useful when comparing equipment options, confirming design limits, or checking that voltage-related requirements are being applied consistently.
Typical use cases
This standard is commonly used for equipment and systems connected to low- and medium-voltage power distribution where 208Y/120 V or 4160 V service is involved. It may support planning for industrial facilities, utility-connected installations, and energy infrastructure that depends on clearly defined electrical ratings. C57.12.51-1981 can also be helpful during specification writing, submittal review, and procurement of components that must match a particular voltage class and application.
Why this standard matters
Using C57.12.51-1981 helps reduce ambiguity in electrical design and purchasing by tying requirements to a specific voltage range. That can improve consistency across documentation, testing, and acceptance criteria, especially when multiple parties are involved in a project. For power and industry applications, having a clear standard reference supports safer selection of equipment, better compatibility with the intended system, and lower risk of mismatch during installation or operation.
- Voltage range: 208Y/120 to 4160 volts
- Power and industry application context
- Design and rating reference
- Specification and procurement support
- Superseded standard status
- Publication Date: 1981
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C57.12.51 (2019)
- Previous Version: C57.12.51 (2009)
- This Version: C57.12.51 (1981)
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