Characteristics of wire sleeve
1, the wire sleeve has good corrosion resistance and long service life, and can be used in wet saline-alkali soil.
2, flame retardant, good heat resistance, can be used at a high temperature of 130 for a long time without deformation, and does not burn in case of fire.
3. High strength and rigidity. It can be directly buried under the driveway without concrete protective layer, which can speed up the construction progress of cable engineering.
4. Pipes and fittings are flexible and can resist the damage caused by external heavy pressure and foundation settlement.
5. Good anti-interference performance for external signals.
6, the inner wall is smooth, and it is not easy to scratch the cable. The design adopts socket connection mode, which is convenient for installation and connection. Adding rubber sealing ring at the joint can not only adapt to thermal expansion and cold contraction, but also prevent mud and sand from entering.
Function of wire sleeve
First, it is convenient to unplug the wires in the future. If the wire is directly buried in cement mortar, it becomes a "dead line". Later, line maintenance, replacement and home smart devices cannot be carried out. I don't deny that most home decoration, despite the use of threading pipes, has been made into a "dead line" and simply drawn, but if it is not done, it may never be drawn.
Secondly, if the insulation layer of the protective wire is directly buried in cement mortar,
Silicate in cement may corrode the insulation of wires, resulting in wire insulation reduction and short circuit. Once it is damp, electric leakage is inevitable. Third, the fire-proof conduit can prevent the flame from spreading, because the general conduit is made of flame-retardant materials, especially galvanized metal pipes. And it will not burn itself, even if the wire leaks or is short-circuited.
Students who have studied the physics of circuit heat dissipation know that when wiring, the cross-sectional area of conductor is usually selected according to the electrical load. Although there is generally a surplus, it is inevitable that electricity will be overloaded in a short time, such as eating hot pot at home and using high-power appliances such as hair dryers. Wires will still generate too much heat, and with the aging of circuits, the load capacity of wires will be weakened. After using the threading tube, it is equivalent to giving the wire a relatively loose space.
The heat of that electric wire can be reduced to a great extent. V. Convenient construction If the wires are laid directly, it is not conducive for workers to master the route direction. It is difficult to ensure the horizontal and vertical arrangement of wires during construction, and it is even more impossible to reach the corresponding specifications such as the interval between strong and weak electricity.
Specification for installation of wire sleeve
When the cable sleeve is formally installed,
A bracket should be installed in advance, which can facilitate the fixing of the casing, and the spacing between each bracket should not be greater than the maximum allowable span of the pipeline. Hangers should be set at the corner of casing, which should be neat and beautiful. At the same time, the hanger should not be welded on the pressure vessel or other equipment, but can be fixed on the support frame by welding or concrete. At the same time, elbows should be set at the joint of casing, but the number of elbows should not exceed three and the number of right-angle elbows should not exceed two. When the number of elbows can't meet the construction requirements in actual construction, conduits should be used or cable boxes should be set at appropriate positions. At the same time, the cable sleeve should be fixed on the edge of the bridge, which can be directly penetrated from the top or bottom. Where the cable sleeve is fixed,
Generally, special clips are used, and welding fixation is prohibited, which may cause the sleeve to shake in the later process. At the same time, the distance between the fixed points of each cable duct should not exceed three meters. The whole cable sleeve should be fixed at least at two points, and corresponding fixing measures should be added at its elbow.