scope:

This standard is intended as a basis for the establishment of performance, limited electrical and mechanical interchangeability, and safety requirements of equipment described; and for assistance in the proper selection of such equipment.

This standard describes electrical, mechanical, and safety requirements of liquidimmersed distribution and power transformers, and autotransformers and regulating transformers; single and polyphase, with voltage 601 V or higher in the highest voltage winding.

This standard applies to all liquid-immersed distribution, power, and regulating transformers except as indicated below:

(1) Instrument transformers

(2) Step-voltage and induction voltage regulators

(3) Arc furnace transformers

( 4) Rectifier transformers

(5) Specialty transformers

(6) Grounding transformers

(7) Mobile transformers

(8) Mine transformers

When this standard is used on a mandatory basis, the words shall and must indicates mandatory requirements; and the words should and may refer to matters which are recommended or permissive, but not mandatory.

NOTE: The Foreword of this voluntary consensus standard describes the circumstances under which the standard may be used on a mandatory basis.