IEEE C57.12.26-1987
Voltage, 34500 Grd Y/19 920 Volts and Below; 2500 kVa and Smaller
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About This Item
C57.12.26-1987 is a technical standard for power and energy applications covering equipment rated at 34,500 Grd Y/19,920 volts and below, with a maximum size of 2,500 kVA and smaller. It is intended to define requirements relevant to electrical design, rating, and performance for this class of equipment, helping users compare products on a consistent basis. As a superseded document, C57.12.26-1987 remains useful for reference, legacy systems, and historical compliance review.
About C57.12.26-1987
C57.12.26-1987 addresses electrical equipment within a defined voltage and kVA range, placing it in the context of medium-voltage power applications. The standard is typically used to support engineering decisions around construction, ratings, and acceptable performance for equipment intended to operate at 34,500 Grd Y/19,920 volts and below. For procurement and technical review, it provides a clear reference point for comparing designs and checking that products match a specific application envelope.
Where is C57.12.26-1987 used?
This standard is relevant where medium-voltage power equipment must be specified for utility, industrial, or facility distribution systems operating within the stated voltage limits. It may be applied during equipment selection for transformers, switchgear-related work, or other power apparatus sized at 2,500 kVA and smaller. Engineers, buyers, and maintenance teams may consult C57.12.26-1987 when matching equipment to system ratings, checking compatibility, or reviewing older installations that were designed around this technical framework.
Importance in practice
In practice, C57.12.26-1987 helps reduce uncertainty when defining acceptable equipment for a particular voltage class and power rating. Clear requirements support consistent design control, safer integration into electrical networks, and more reliable procurement decisions. For organizations managing legacy assets, the standard can also help with documentation review, replacement planning, and performance comparison. Because it is superseded, it is especially useful as a reference when evaluating older equipment against historical requirements.
- Voltage range: 34,500 Grd Y/19,920 volts and below
- Equipment size: 2,500 kVA and smaller
- Power and energy technical context
- Useful for legacy reference and compliance review
- Publication Date: 1987
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
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