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 Rectifier-transformer equipment Transformers for which these standards do not apply are autotransformers used as part of autostarters, 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.
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