Superseded Standard

ANSI C57.1, C57.2 C57.3-1942

ANSI American Standards for transformers, Regulators, and Reactors

These standards apply to the following general classes of apparatus: Distribution, Power, and Regulating Transformers, and Reactors other than Current-Limiting Reactors Instrument Transformers Constant-Current Transformers of the Moving-Coil Type Step-Voltage and Induction-Voltage Regulators Current-Limiting Reactors General-Purpose Specialty Transformers Transformers for which these standards do not apply are auto-transformers used as part of auto-starters, testing transformers, welding transformers, auxiliary transformers for series street lighting, and small transformers for special purposes such as door-bell and luminous-tube transformers. Dry-type transformers rated 50 kva and below and 600 volts or less shall be considered as general-purpose specialty transformers.

Superseded Standard
Board Approval

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