Cable tray installation control standards and specific implementation procedures

Cable tray installation control standard:

Cable tray horizontal mounting bracket spacing: 1.
5-3 meters, vertical mounting bracket spacing: not more than 2 meters;

The top layer of the cable bracket is not less than 150-200mm from the top of the shaft or the top of the floor, and the bottom of the bottom trench or ground of the cable bracket is not less than 50-100mm;

Metal conduit is strictly forbidden to weld the opposite mouth, galvanized and steel conduit with a wall thickness of less than 2mm shall not be casing fusion welded connection;

Lay steel conduit below the outdoor ground, the buried depth should not be less than 0.
7 meters, and the wall thickness should not be less than 2mm;

When there is no design requirement, it is buried in the wall or concrete power pipe, and the conduit above medium size is used;

When connected to electrical equipment through flexible conduit, the power equipment is not greater than: 0.
8 meters, and the lighting equipment is not larger: 1.
2 meters
.

Cable tray installation and cable laying process:

1.
Measure and position, install the bracket of the bridge, and install the bridge after inspection and confirmation;

2.
The bridge installation inspection is qualified to lay the cable;

3.
The insulation test before the cable is laid is qualified before it can be laid;

4.
The cable electrical handover test is qualified, and the wiring direction, phase and fire isolation measures are checked and confirmed, and the power
can be turned on.