本标准涵盖单相、60 Hz、充液、自冷、垫装、隔间式配电变压器的某些电气、尺寸和机械特性以及安全要求。这些变压器的额定值为250 kVA及以下，高压为34 500 GrdY/19 920 V及以下，在单相和接地中性点之间运行，低压为480/240 V及以下。这些变压器通常用于地下一次电缆电源的降压目的。本标准涵盖径向或环形馈电系统的连接器、衬套和端子布置。本标准不包括变压器可能附带的任何附件装置的电气和机械要求。

This standard covers certain electrical, dimensional, and mechanical characteristics and safety requirements of single-phase, 60-Hz, liquid-filled, self-cooled, pad-mounted, compartmental-type distribution transformers. These transformers are rated 250 kVA and smaller with high voltages of 34 500 GrdY/19 920 V and below for operation between one phase and grounded neutral and low voltage of 480/240 V and below. These transformers are generally used for step-down purposes from an underground primary cable supply. This standard covers the connector, bushing, and terminal arrangements for radial or loop feed systems. This standard does not cover the electrical and mechanical requirements of any accessory devices that may be supplied with the transformer.