A very important step in the decoration of the house is the design of the circuit. At the same time, because the power consumption in daily life is also very large, the requirements for the cable to enter the house are also very high. At the same time, we must also pay attention to the problem of cable waterproofing. The following editor will talk about the relevant content of cable waterproof joints, so that friends can safely do cable home work.
1. How to make the cable waterproof joint?
1. If armored cable is used, it does not need to be waterproof unless the outer shell of the cable is damaged during threading. Generally, so-called cables are effectively waterproof as long as there is no water in the cable head. According to general work experience, a proper amount of water in the cable groove can also improve the heat dissipation capacity of the cable.
2. Only when entering the interior from the outside, the cable groove should be waterproofed. The remaining parts do not need to be waterproofed, but the drainage facilities must be preserved. If iron pipe is used throughout, and the cable is not watertight, bend and straighten the pipe to death before threading it, which may require a welder's skill.
3. The most commonly used is the flexible steel waterproof casing, which has relatively strong waterproof performance. Generally, most manufacturers make specifications according to relevant industry standards and perform well. When the waterproof and flexible shell passes through the wall, if it is not concrete, it must become a concrete wall, and the anti-shell must be cured on the wall at the same time.
2. The practice of cable entry
1. General building cable wells have grounding plates. These boards are grounded. Whenever a solid wire is connected to a power distribution stage, the connection of the ground wire must be connected to the ground wire. The iron will open up the structural columns of the house to expose the rebar, and a welding machine will be used to burn the joints.
2. For rubberized cables, it is not necessary to ground in the middle. Towers and other corresponding equipment must be properly grounded, which can be determined as long as procedures are standardized. It must be pointed out that if it is a shielded cable, you can use the rubber cover to put the clamp on the cable tube and connect it when grounding, but be careful not to put it on the cable.
3. The cable protection tube must be smooth and flat, without perforation or cracks, and without burrs or sharp corners in appearance. There should be no cracks in the manufacture of bent tubes. The orifice is shaped like a trumpet and is not more than 10% flat. The bending radius must not be smaller than the minimum allowable bending radius of the cable. The outer surface of the cable protection tube must be well protected against rust and corrosion. Usually, a coat of asphalt paint is applied. If it is a galvanized pipe, it must be prepared for galvanizing and stripping. If you're going underground, it's even more important to be prepared for corrosion protection.
4. If the diameter of the cable protection tube is not required, the ratio of the inner diameter of the tube to the outer diameter of the cable shall not be less than 1.5. There should be no more than 3 elbows and no more than 2 right-angle bends. The connection of the cable protection tube must be firm, well-sealed, and the two ports are aligned and cannot be directly butt-welded. The cable protection tube must be properly grounded, but this is not necessary if the tube joint is welded with a sleeve.
The above is the relevant content about the cable waterproof joint. If you want to do a good job in cable waterproofing, you must learn more about this aspect. You must pay attention to the safety of electricity use, which is related to the safety of your family.
