Cable tray wiring matters needing attention

Lifting wire slot is mainly used for indoor installation of lamps and lanterns.

Construction according to approved design, general requirements are as follows:

Cable tray wiring

(1) used in indoor cable tray wiring, the cable should be no jute or other Yi Yan burning materials outer sheath.

(2) in the places where corrosion or special moisture using cable tray wiring, should take the corresponding protective measures according to different corrosion medium, and appropriate chooses plastic sheath cable.

(3) the level of cable tray (tray) when installation height should not be commonly less than 2.50 m distance, vertical distance to 1.80 m in the following sections when installation should add metal cover plate to protect, but lay in electrical special room (such as substation, electrical shaft, technology level, etc.) within the exception.

When mounted horizontally, (4) the cable tray should be selected according to the load curve best support span, span 1.5 ~ 3 m in general. Vertical installation, the fixed point spacing should not be greater than 2 m.

(5) sets of parallel installation cable tray in the same height, the distance between adjacent cable tray should consider the maintenance or overhaul.

(6) in the cable bridge frame can be no distance between laying cable, cable bridge in cross-sectional fill rates: power cable should not be greater than 40%; Control cable should not be greater than 50%.

(7) the following different voltage, different USES of cable, should not be on the same floor laying bridge frame:

1) the lkV above and below 1 kv cable.

2) the same path to the level of load power supply dual power cable.

3) emergency lighting and other lighting cable.

4) high voltage and low voltage cables.

Such as restricted by conditions of bridge rack should be installed in the same layer, application of partition.

(8) parallel cable tray with a variety of pipe or cross, its minimum clear distance should comply with the provisions of the table DQ4-1.

(9) cable tray should not be installed in the upper part of the corrosive gas pipe and heat pipe and corrosive liquid pipe below, otherwise, anti-corrosion, insulation measures should be taken.

(10) cable tray in the cable should be fixed in the following parts. With the top of the vertical run, cable and every 1.50 ~ 2 m. Level, laying cable first, turn tail ends, and every 5 ~ 10 m.