本推荐规程涵盖了所有单相和多相通风、非通风和密封干式配电和电力变压器或自耦变压器的应用、安装、操作和维护的一般建议，包括带有实心铸造和/或树脂封装绕组的变压器，但以下情况除外:a）仪表变压器b）阶梯式和感应式电压调节器c）电弧炉变压器d）整流变压器e）专用和通用变压器f）矿井变压器g）测试变压器h）焊接变压器

This recommended practice covers general recommendations for the application, installation, operation, and maintenance of all single and polyphase ventilated, non-ventilated, and sealed dry-type distribution and power transformers or autotransformers, including those with solid-cast and/or resin encapsulated windings except as follows: a) Instrument transformers b) Step- and induction-voltage regulators c) Arc-furnace transformers d) Rectifier transformers e) Specialty and general purpose transformers f) Mine transformers g) Testing transformers h) Welding transformers