本推荐规程是国家电气安装标准（NEIS），旨在提高 适用于室内商业照明系统安装的电气施工服务的指定方、采购方和供应商之间的沟通。它定义了安装此类电气产品的最低质量和工艺基准。本规程描述了商业和零售建筑内常用照明系统的安装程序。本惯例的主要部分包括:解释重要术语的定义； 一般安装实践讨论从现场接收材料到完成安装的所有必要程序，并向建筑业主提供备件和灯具清单；嵌入式照明系统提供适用于悬挂式无障碍（网格）天花板、墙板和其他无障碍硬天花板的逐步说明；以及表面和悬挂式照明系统，提供了包括轨道照明在内的成品天花板上（或下方）的许多典型安装情况。此外，附录A提供了订购适用于不同应用的合适troffer类型的指南； 附录B列出了适用于许多美国司法管辖区的标准筒灯等级；而附录C包含了两个用于在商业照明系统中安装悬挂式灯具的专用安装装置示例。

This Recommended Practice is a National Electrical Installation Standard (NEIS) designed to improve communications among specifiers, purchasers, and suppliers of electrical construction services as they apply to the installation of indoor commercial lighting systems. It defines a minimum baseline of quality and workmanship for installing such electrical products. This Practice describes installation procedures for lighting systems commonly used inside commercial and retail buildings. The main sections of this Practice are: definitions giving an explanation of important terminology; general installation practices discussing every necessary procedure from receiving material on site to completing the installation and providing the building owner with spare parts and a lamp list; recessed lighting systems providing step-by-step instructions that apply to suspended accessible (grid) ceilings and to wallboard and other inaccessible hard ceilings; and surface and suspended lighting systems giving the rundown on many typical mounting situations on (or beneath) a finished ceiling including track lighting. In addition, Appendix A provides guidance in ordering the appropriate troffer types for different applications; Appendix B lists standard downlight ratings that apply in many U.S. jurisdictions; while Appendix C contains two example illustrations of special-purpose mounting devices useful for installing suspended luminaires in commercial lighting systems.