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W-T-631 Revision C, June 4, 1964
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Includes all amendments and changes through Cancellation Notice 1, December 28, 2012
Additional Comments: CNCL NO S/S
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This specification covers single-phase and three-phase 60 cycle, overhead-type, liquid-immersed, air-cooled distribution power transformers rated 500 kv.-a and smaller; high voltage, 67,000 volts and below; low voltage 15,000 volts and below.

Distribution transformers furnished under this specification shall be of the following types and classes, as specified (see 6.1).

        Type I--Mineral oil insulated.
        Type II--Nonflammable liquid insulated.
        Type III--Mineral oil insulated, wholly


        Class 1--Single phase.

        Class 2--Three phase.

Transformers furnished under this specification shall be of standard commercial kv.-a and voltage ratings, as specified (see 6.1).