When the cable tray is allowed to form the grounding trunk circuit, the cable tray and its support and hanger connection plate shall be able to accept the grounding fault current and meet the requirements of thermal effect. As the grounding trunk, the connection resistance between the increased price end of the tray shall be greater than 0.00033 Ω. When the cable tray is used as the grounding trunk, all kinds of expansion joints and soft joints of the cable tray shall be made of copper The cross section of flexible conductor or woven copper wire shall not be less than 16mm2.

电缆桥架全线独自敷设接地干线，接地干线选用扁钢时，室内敷设时其截面应不小于60m㎡，室外敷设其截面应不小于10m㎡。桥架在引进引出建筑物时，应与建筑物室内接地干线或室外接地设备相衔接。

The whole cable bridge shall be laid with grounding main line independently. When flat steel is used for grounding main line, the cross section shall not be less than 60m m2 for indoor laying and 10m m2 for outdoor laying. When the bridge is introduced into or led out of the building, it shall be connected with the indoor grounding main line or outdoor grounding equipment of the building.

为了避免电化学腐蚀效果，在铝合金电缆桥架上不得用裸铜道题作接地干线，电缆桥架禁止作为人行道梯子或站人渠道，其支吊架不得作为吊挂重物的支架运用，在电缆桥架中腐蚀电缆时，禁止运用电缆桥架的支吊架做固定起吊设备做拖动设备及滑轮和支架。

In order to avoid the effect of electrochemical corrosion, the bare copper track shall not be used as the grounding main line on the aluminum alloy cable tray, the cable tray shall not be used as the sidewalk ladder or standing channel, and its support and hanger shall not be used as the support for hanging heavy objects. When the cable is corroded in the cable tray, the support and hanger of the cable tray shall not be used as the fixed lifting equipment, the dragging equipment, pulley and support.

当电缆桥架外表有绝缘涂层时，应将接地址或需求电气衔接处的绝缘涂层铲除洁净，电缆桥架在振荡场所及电气接地部位的衔接螺栓应加装绷簧垫圈。

When there is insulation coating on the surface of the cable tray, the insulation coating at the grounding address or the required electrical connection shall be removed and cleaned, and the connection bolts of the cable tray at the oscillation place and the electrical grounding part shall be equipped with spring washer.

关于设备在钢制吊架上或用钢制附件固定的铝合金电缆桥架，当钢制件外表为热浸锌时，能够和铝合金桥架直接触摸，当其外表为喷涂粉末涂层或涂漆时，则应在铝合金桥架触摸面之间用聚氯乙烯或氯丁橡胶衬垫阻隔。

For the aluminum alloy cable tray with the equipment on the steel hanger or fixed with steel accessories, when the surface of the steel parts is hot-dip galvanized, it can be directly touched with the aluminum alloy cable tray. When the surface of the steel parts is sprayed with powder coating or painting, it should be blocked with polychloroethylene or chloroprene rubber gasket between the contact surfaces of the aluminum alloy cable tray.