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、电缆桥架、支架和吊架以及进出的金属电缆导管应受到保护和接地，并应符合下列要求:

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)金属电缆桥架及其支吊架的总长度应不少于2处与接地干线相连。

(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)非镀锌电缆桥架间连接板两端的交叉铜导线或编织铜线的允许横截面不得小于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) 镀锌电缆桥架间连接板的两端不可做接地跳线，但每个连接板应有不少于2个带防松螺母或防松垫圈的连接固定螺栓。

(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.当允许电缆桥架作为接地主回路时，电缆桥架及其支撑、吊架和连接板应能承受接地故障电流，并满足热效应的要求。

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.对于作为接地主线的电缆桥架，托盘与梯架末端之间的连接电阻不得大于0.00033ω。 4、当采用电缆桥架作为接地线时，桥架跨中的各种伸缩缝和软接头应采用铜质软线或编织铜丝连接，其截面应小于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、当沿电缆桥架跨越单独数量的接地线时，接地线采用扁钢，室内敷设时其截面应不小于60毫米，室外设置时其截面应不小于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.电缆桥架引出建筑物时，应与建筑物的室内接地干线或室外接地装置连接。

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.为了防止电化学腐蚀，裸铜导线不得用作铝合金电缆桥架上的接地主线。

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

以上是电缆桥架接地时的七个注意事项。电缆桥架结构简单，外形美观，配置灵活，维护方便。它广泛应用于所有主要建筑。这是一种建筑设施，不分割行业的一部分，可以适应各种环境。发展前景非常广阔。

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.