电缆桥架及支架和引入或引出的金属电缆导管必须接地或接零可靠，且必须符合下列规定：

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、金属电缆桥架及其支架全长应不少于2处与接地或接零干线相连接。

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、非镀锌电缆桥架间连接板的两端跨接铜芯接地线，接地线小允许截面积不小于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、镀锌电缆桥架间连板的两不跨接接地线，但连接板两端不少于2个有防松螺帽或防松垫圈的连接固定螺栓。

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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The above is an introduction to Shandong cable tray. For more information, please click: http://www.sdhangfeng.com We will wholeheartedly provide you with full score service. Welcome to call us!