The National Electric Code, in Article 690.5, requires that any PV array installed on the roof of a dwelling must incorporate a ground-fault protection device to reduce fire hazards.
《美国国家电气法规》第690.5条规定，安装于住宅楼顶的任何光伏阵列都必须配备接地故障保护器件，以减少火灾隐患。
The fire detection system is a safety device for protection of personnel and facility.
火焰探测系统是用来保护人员和设备安全的装置。
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