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Anyone who has seen the decoration should have seen the electrician threading the outer white casing. This layer of pipe is actually a PVC pipe. The first is to protect the wire and the other is to be safe. But what one might not know is how many wires should be installed in each PVC pipe? In fact, there are national standards, so I will share with you this knowledge today.
The national standard stipulates that the space occupied by the wires in the PVC pipe needs to be less than or equal to 40%. That is to say, if the PVC threading pipe of the household is 16 mm, it is necessary to wear the wire of 2.5 mm, which can only be used inside the pipe. Wear about 6 wires. According to the cross section of the conduit, it can generally be judged whether the threading meets this requirement.
Pay attention when threading: According to the groove provided at the construction site, the pipe should be arranged on the wall and the top when the pipe is arranged in the water room. Strong and weak wires should be laid through the pipe, and different types of wires should not be installed in the same pipe. During the wiring process, the junction box is used at the junction of the conduit, and the wiring cap is used at the wiring. Separate colors when wiring. Maybe everyone will wonder why there is so much space left in the online tube? This is because the wires have a fever during use, leaving space for the wires to dissipate better. And once the circuit is short-circuited, it is difficult to find the problem with the line filled with wires, and it is very difficult to take out the problematic wires, so it is necessary to leave some space.
Here are a few of the standard threading methods, you can look at:
1. In reality, some wires are relatively long and need to be turned around. In this case, some talc powder needs to be added inside the wire tube to facilitate the extraction of wires in the future. Also, the insulating layer material in the front part of the wire needs to be slightly removed, and then the core can be fixed in the coil.
2. Wires with different voltages and different circuits cannot be worn in the same conduit. The wires installed in the same conduit must correspond to the same voltage and the same circuit. If the loops of multiple lamps do not interfere with each other, there is no way to thread too much.
3. After stringing the wires, cut the wires. If the points are connected to the switches, sockets and junction boxes, you need to reserve 15 cm more. The wires outside the door need to be about one and a half meters long. The inside of the distribution box needs to have a length of 1/2 of the circumference of the distribution box.
