IEEE 21-1964
American Standards Requirements and Test Code for Outdoor Apparatus Bushings
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About This Item
21-1964 is the standard titled American Standards Requirements and Test Code for Outdoor Apparatus Bushings, addressing the requirements and test methods used for bushings installed on outdoor electrical apparatus. It is relevant to power and energy applications where insulation, mechanical integrity, and electrical performance must be defined with care. As a superseded technical document, 21-1964 is still useful for historical reference, design comparison, and understanding earlier acceptance criteria for this equipment category.
21-1964 overview
This standard focuses on the technical requirements and testing associated with outdoor apparatus bushings, which are components used to carry conductors through grounded enclosures or structures while maintaining insulation. It typically serves as a reference for dimensional, material, and performance expectations, along with test procedures intended to verify suitability for service. In the context of components, circuits, devices, and systems, 21-1964 helps define how bushing design and evaluation were approached for outdoor electrical installations.
Typical use cases
The requirements in 21-1964 are most relevant when evaluating bushings for outdoor transformers, switchgear, circuit breakers, and similar power apparatus. It may also be used when reviewing older equipment specifications, comparing replacement parts, or checking legacy test documentation for utility and industrial electrical systems. Engineers, maintenance teams, and procurement staff can use it to better understand how outdoor bushing performance was specified for high-voltage service and weather-exposed installations.
Why this standard matters
For outdoor apparatus bushings, consistent requirements help reduce the risk of insulation failure, poor fit, or unreliable service under environmental exposure. 21-1964 supports more controlled design review and testing by giving buyers and engineers a defined reference for acceptance criteria. In procurement and maintenance work, that can improve comparability between products, help confirm compatibility with older equipment, and provide a clearer basis for evaluating electrical performance, durability, and safety-related characteristics.
- Outdoor apparatus bushing requirements
- Test code for electrical performance
- Legacy power equipment reference
- Insulation and construction considerations
- Historical compliance and comparison use
- Publication Date: 1964
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications; Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: 21 (1942)
- Previous Version: 21 (1941)
- Previous Version: 21 (1976)
- This Version: 21 (1964)
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