Mains and external signal cables longer than 10 m shall in areas where lightning is frequent be protected with an external lightning surge protection at the cable entrance to the building.
主线和外部信号线超过10米的，在线进入大楼的入口处时设置避雷保护，避免雷击。
Mains and external signal cables longer than 10 m shall in areas where lightning is frequent be protected with an external lightning surge protection at the cable entrance to the building.
主线和外部信号线超过10米的，在线进入大楼的入口处时设置避雷保护，避免雷击。
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