IEEE 21-1976
IEEE General Requirements and Test Procedure for Outdoor Apparatus Bushings
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About This Item
IEEE 21-1976 is a technical standard for outdoor apparatus bushings, defining general requirements and test procedures relevant to power, energy, and industry applications. It helps describe how these insulated components should be designed and evaluated for service in exposed electrical equipment. For engineers, buyers, and compliance teams, the standard provides a common basis for comparing performance, construction, and testing expectations for outdoor bushing applications.
What is IEEE 21-1976?
This standard addresses the general requirements and test procedure for outdoor apparatus bushings, which are insulating components used where conductors pass through grounded barriers in electrical apparatus. IEEE 21-1976 focuses on the technical conditions needed to assess these bushings in an outdoor environment, where weather exposure and electrical stress are important considerations. As a result, it supports consistent engineering review, product specification, and testing practice for this type of equipment.
Where is IEEE 21-1976 used?
IEEE 21-1976 is commonly used in the specification and evaluation of bushings for outdoor power equipment, including apparatus installed in substations and other high-voltage settings. It is relevant when selecting or testing components that must perform reliably under environmental exposure, insulation demands, and operational electrical loading. In practice, it may support procurement, design verification, and acceptance testing for utility and industrial systems that use outdoor insulating bushings.
Why is IEEE 21-1976 important?
This standard matters because outdoor bushings are critical interface components, and their performance can affect equipment reliability and safety. IEEE 21-1976 provides a structured basis for requirements and test procedures, helping reduce ambiguity in design and evaluation. That can improve consistency across suppliers, support compliance discussions, and lower the risk of premature insulation failure or unsuitable product selection. For technical teams, it offers a practical reference point for engineering control and quality review.
- Outdoor apparatus bushing requirements
- Test procedures for insulation performance
- Environmental exposure considerations
- High-voltage equipment application
- Specification and compliance support
- Publication Date: 1976
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: 21 (1942)
- Previous Version: 21 (1941)
- This Version: 21 (1976)
- Previous Version: 21 (1964)
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