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.

電纜橋架全線獨自敷設接地干線，接地干線選用扁鋼時，室內敷設時其截面應不小于60m㎡，室外敷設其截面應不小于10m㎡。橋架在引進引出建筑物時，應與建筑物室內接地干線或室外接地設備相銜接。

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.

為了避免電化學腐蝕效果，在鋁合金電纜橋架上不得用裸銅道題作接地干線，電纜橋架禁止作為人行道梯子或站人渠道，其支吊架不得作為吊掛重物的支架運用，在電纜橋架中腐蝕電纜時，禁止運用電纜橋架的支吊架做固定起吊設備做拖動設備及滑輪和支架。

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.

當電纜橋架外表有絕緣涂層時，應將接地址或需求電氣銜接處的絕緣涂層鏟除潔凈，電纜橋架在振蕩場所及電氣接地部位的銜接螺栓應加裝繃簧墊圈。

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.

關于設備在鋼制吊架上或用鋼制附件固定的鋁合金電纜橋架，當鋼制件外表為熱浸鋅時，能夠和鋁合金橋架直接觸摸，當其外表為噴涂粉末涂層或涂漆時，則應在鋁合金橋架觸摸面之間用聚氯乙烯或氯丁橡膠襯墊阻隔。

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.