Precautions for power piping and wiring during electrical engineering line construction

Wiring is the work of connecting insulated wires from the distribution box to the electrical equipment through the wire tube. In order not to damage the wire, before threading, clean the inside of the wire with air or cloth, then blow in talc, and install the protective sleeve at the threading end.

A wire is usually used to introduce a catheter. When the pipe is long or has multiple elbows, one end of the pipe should be wired and the other end should be wired. In addition, the two should coordinate their actions. The wires in the exhibition hall should be parallel and should not be entangled with each other.

In order to ensure the safe and reliable operation of the wires in the conduit, all the wires in the same loop must be placed in the same tube. Circuits with different voltages must not be placed in the same tube, and the wires in the tube must not have connectors.

Note the following when wiring pipes:

1. The insulation strength of the conduit wire is not less than 500V, the minimum cross section of the copper conductor is 1mm2 (except for weak current lines), and the minimum cross section of the aluminum conductor is 2.5mm2.

2. There are no connectors in the conductor tube. After the insulation is damaged, do not enter the bundled conductor to restore the insulation.

3. Under normal circumstances, the tube wire should not exceed 10, different voltages or different meters of the wire should not be placed in the same conduit, but the motor wire includes all the wires of the control and signal circuit, the same equipment of multiple motor wires are allowed to be placed in the same conduit.

4. In addition to the DC circuit wire and ground wire, no single wire is allowed to wear in the steel pipe;

5. When turning the pipeline, the method of bending the pipe should be used, and the finished elbow should not be used to avoid too many pipe mouth joints;

6. The pipe line should turn as little as possible, because the more corners, the more difficult it is to thread. In order to facilitate threading, when the length of the conduit exceeds these lengths, a junction box needs to be added. No corner is greater than 45m, one corner is less than 30m, two corner is less than 20m, and three corner is less than 12m.

7. The pipe with a wall thickness of 3mm must be used to cover the wire in the concrete. When the outer diameter of the conduit exceeds 1/3 of the thickness of the concrete, the conduit is not allowed to be buried in the concrete to avoid affecting the strength of the concrete.