電纜橋架及支架和引入或引出的金屬電纜導管必須接地或接零可靠，且必須符合下列規定：

Cable trays and brackets, as well as metal cable conduits introduced or led out, must be reliably grounded or grounded, and must comply with the following regulations:

　　1、金屬電纜橋架及其支架全長應不少于2處與接地或接零干線相連接。

1. The total length of the metal cable tray and its bracket should not be less than 2 points connected to the grounding or neutral main line.

　　2、非鍍鋅電纜橋架間連接板的兩端跨接銅芯接地線，接地線小允許截面積不小于4平方毫米。

2. The two ends of the connecting plate between non galvanized cable trays are crossed with copper core grounding wires, and the minimum allowable cross-sectional area of the grounding wire is not less than 4 square millimeters.

　　3、鍍鋅電纜橋架間連板的兩不跨接接地線，但連接板兩端不少于2個有防松螺帽或防松墊圈的連接固定螺栓。

3. The two non bridging grounding wires between galvanized cable trays shall be connected, but there shall be no less than two connection fixing bolts with anti loosening nuts or washers at both ends of the connecting plate.

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