论文部分内容阅读
引言1．适用范围1．1安装使用于危险场所l级及区、2区AB、CxD组；11级2区G组和m级1区和2区的电气照明灯具装置均应符合国家电气规范NFPA70的要求。1．2这些电气照明灯具装置的要求是指灯具装置使用于下述环境条件：A．最低环境温度为一25℃（－13下）；B．氧气的浓度不大于21％
Introduction 1. Scope of application 1.1 Installation Used in hazardous area l and area, Zone 2 AB, CxD group; 11 Class 2 Zone G Group and m Class 1 and Zone 2 electrical lighting fixtures should comply with the requirements of the National Electrical Code NFPA70 . 1.2 The requirements of these electrical lighting fixtures means that the fixtures are to be used in the following environmental conditions: The minimum ambient temperature of a 25 ℃ (-13 under); B. Oxygen concentration of not more than 21%