本标准描述了以汽油、天然气或液化石油气（LP或丙烷）为燃料的住宅发电机的安装和维护程序，这些发电机永久安装在一户住宅中，以提供备用电源。住宅发电机的额定电压通常为240/120伏，单相，三线制。一些较大的单户住宅有三相电气系统，可能使用额定值为208Y/120伏的三相四线备用发电机。本标准还涵盖了非自动（手动）或自动转换开关（MTS或ATS）、隔离开关、控制面板和燃油供应系统等相关项目的安装，并描述了与使用发电机供应重要非电气设备相关的一些配电系统设计考虑- 单户住宅的应急负荷。根据NEC，住宅发电机被视为“可选备用电力系统”。

This standard describes installation and maintenance procedures for residential generators fueld by gasoline, natural gas, or liquefied petroleum gas (LP or propane) and permanently installed at one-family dwellings to provide backup power. Residential generators are usually rated 240/120 volts, single-phase, three-wire. Some larger one-family dwellings have three-phase electrical systems and may use backup generators rated 208Y/120 volts, three-phase, four-wire.This standard also covers the installation of related items such as non-automatic (manual) or automatic transfer switches (MTS or ATS), disconnect switches, control panels, and fuel supply systems, and describes some electrical power distribution system design consideration related to the use of generators to supply important, non-emergency loads in single-family dwellings.Residential generators are considered to be "optional standby power systems" in accordance with the NEC.