scope:

This standard is intended for use as a basis for determining the performance, interchangeability, and safety of the equipment covered, and to assist in the proper selection of such equipment.

This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of single- and three-phase, 60-Hz, mineral-oil-immersed, self-cooled, overhead-type distribution transformers 500 kVA and smaller, with high voltages 34500 volts and below and low voltages 7970/13800Y volts and below. Such transformers may include one or more of the following features:

1) High-voltage, overcurrent protection

2) High-voltage, overvoltage protection

3) Low-voltage, overcurrent protection

4) Low-voltage, overvoltage protection

NOTE - For polychlorinated-biphenyl (PCB) contamination in transformers, refer to the latest federal regulations.