These standards apply to the following general classes of apparatus: Distribution and Power Transformers Instrument Transformers Constant-Current Transformers Step-Voltage and Induction-Voltage Regulators Current-Limiting Reactors Transformers for which these standards do not apply are auto-transformers used as part of autostarters, testing transformers, welding transformers, auxiliary transformers for series street lighting and small transformers such as those used for luminous-tube signs and miscellaneous commercial and household devices.
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- Superseded Standard
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