请注意:此版本的所有临时修订版将在您购买时提供。LED标志和标志改装套件SUL 879A适用范围本标准涵盖用于现场安装的LED（发光二极管）套件，用于改装已安装在现场的标志，以及用于安装在新标志中的LED套件。改装套件这些LED套件旨在更换与标志中使用的照明类型相关的电气组件，如霓虹灯、荧光灯和HID。霓虹灯标志组件包括霓虹灯管、管支架、霓虹灯电源以及霓虹灯电源的所有二次接线。荧光标志组件包括荧光管、镇流器、镇流器二次接线，在某些情况下还包括灯座。改装套件包括电源或变压器、电源或变压器外壳、LED和LED安装方式以及安装说明。 新标志结构组件电源装置在电气外壳、安装、电源连接等方面可能不完整。LED、二次接线和LED变压器或电源可单独提供。

Please note: All interim revisions for this edition available at time of your purchase will be included.LED Sign and Sign Retrofit KitsUL 879AScopeThis standard covers LED (light emitting diode) kits intended for field installation to retrofit signs already installed in the field and LED kits intended for installation in new signs.Retrofit kitsThese LED kits are intended to replace the electrical components related to the type of illumination used in a sign, such as neon, fluorescent, and HID. Neon sign components include neon tubes, tube supports, neon power supplies, and all secondary wiring from the neon supply. Fluorescent sign components include fluorescent tubes, ballast, and ballast secondary wiring, and in some cases lampholders.Retrofit kits include the power supply or transformer, power supply or transformer enclosure, the LEDs and the LED mounting means, and installation instructions.New sign constructionComponent power units may be incomplete with respect to electrical enclosure, mounting, supply connections, etc. LEDs, secondary wiring, and LED transformers or supplies may be provided separately.