The cable tray needs to be grounded in the installation process, which is safer. The following small series to explain the cable tray grounding precautions:

1、電纜橋架、支架和吊架以及進(jìn)出的金屬電纜導(dǎo)管應(yīng)受到保護(hù)和接地，并應(yīng)符合下列要求:

1. Cable trays, supports and hangers as well as metal cable ducts entering and leaving shall be protected and grounded, and shall meet the following requirements:

(1)金屬電纜橋架及其支吊架的總長度應(yīng)不少于2處與接地干線相連。

(1) The total length of the metal cable tray and its supports and hangers shall not be less than 2 points connected with the grounding main line.

(2)非鍍鋅電纜橋架間連接板兩端的交叉銅導(dǎo)線或編織銅線的允許橫截面不得小于4 mm。

(2) The allowable cross section of cross copper conductor or braided copper wire at both ends of connecting plate between non galvanized cable trays shall not be less than 4 mm.

(3) 鍍鋅電纜橋架間連接板的兩端不可做接地跳線，但每個(gè)連接板應(yīng)有不少于2個(gè)帶防松螺母或防松墊圈的連接固定螺栓。

(3) Grounding jumper is not allowed at both ends of the connecting plate between galvanized cable trays, but each connecting plate shall have at least 2 connecting and fixing bolts with lock nuts or lock washers.

2.當(dāng)允許電纜橋架作為接地主回路時(shí)，電纜橋架及其支撐、吊架和連接板應(yīng)能承受接地故障電流，并滿足熱效應(yīng)的要求。

2. When the cable tray is allowed to be used as the main grounding circuit, the cable tray and its support, hanger and connecting plate shall be able to withstand the grounding fault current and meet the requirements of thermal effect.
              

3.對(duì)于作為接地主線的電纜橋架，托盤與梯架末端之間的連接電阻不得大于0.00033ω。  4、當(dāng)采用電纜橋架作為接地線時(shí)，橋架跨中的各種伸縮縫和軟接頭應(yīng)采用銅質(zhì)軟線或編織銅絲連接，其截面應(yīng)小于16毫米.

3. For the cable tray as the main grounding line, the connection resistance between the tray and the end of the ladder shall not be greater than 0.00033 ω。

   4. When the cable tray is used as the grounding wire, all kinds of expansion joints and flexible joints in the bridge span shall be connected by copper flexible wire or braided copper wire, and the cross section shall be less than 16mm

5、當(dāng)沿電纜橋架跨越單獨(dú)數(shù)量的接地線時(shí)，接地線采用扁鋼，室內(nèi)敷設(shè)時(shí)其截面應(yīng)不小于60毫米，室外設(shè)置時(shí)其截面應(yīng)不小于100毫米.

5. When crossing a separate number of grounding wires along the cable tray, the grounding wire shall be made of flat steel, and its section shall not be less than 60mm when it is laid indoors, and not less than 100mm when it is set outdoors

6.電纜橋架引出建筑物時(shí)，應(yīng)與建筑物的室內(nèi)接地干線或室外接地裝置連接。

6. When the cable tray leads out of the building, it shall be connected with the indoor grounding trunk line or outdoor grounding device of the building.

7.為了防止電化學(xué)腐蝕，裸銅導(dǎo)線不得用作鋁合金電纜橋架上的接地主線。

7. In order to prevent electrochemical corrosion, bare copper conductor shall not be used as grounding main line on aluminum alloy cable tray.

以上是電纜橋架接地時(shí)的七個(gè)注意事項(xiàng)。電纜橋架結(jié)構(gòu)簡單，外形美觀，配置靈活，維護(hù)方便。它廣泛應(yīng)用于所有主要建筑。這是一種建筑設(shè)施，不分割行業(yè)的一部分，可以適應(yīng)各種環(huán)境。發(fā)展前景非常廣闊。

The above are seven points for attention when grounding the cable tray. The cable tray has the advantages of simple structure, beautiful appearance, flexible configuration and convenient maintenance. It is widely used in all major buildings. This is a kind of construction facilities, not part of the industry, can adapt to a variety of environments. The development prospect is very broad.