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. 1.2 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. 1.3 This standard applies t o 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 1.4 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.
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