In recent years, with the rapid development of the communications industry, wire, and cable products have also developed at an astonishing speed. The use of cables has also been greatly improved and is very flexible.
The line can be wound on the cable reel with a bending radius ≥20D, where D is the outer diameter of the cable.
A cable is usually made of several or several groups of wires (each group of at least two) twisted together into a rope-like cable, each group of wires insulated from each other and often twisted around a center, the entire outer wrapped with a highly insulating cover.
Mostly erected in the air or installed underground, underwater, for telecommunications or power transmission.
Cables can be divided into power cables, communication cables, control cables, etc. according to their uses.
Some cables are smokeless and non-toxic when burned, and the insulating materials are "non-flammable" inorganic materials. In the combustion process, no harmful gas will be produced, nor will it cause secondary pollution.
It is called an environmentally friendly green product. Security is good. In addition to the normal power supply, the MICC fire extinguishing cable can also start fire extinguishing equipment in the flame to reduce fire losses.
At the same time, it is particularly reliable for personal safety. The copper sheath is a good conductor and the best grounding wire.
It extends to the full length of the cable, which significantly improves the sensitivity and reliability of grounding protection.
And it has a long service life, inorganic insulating material, high-temperature resistance, not easy to age, and its service life is many times longer than that of organic insulated cables. Under normal working conditions, its service life can be equal to the service life of a building.
So are there any safety requirements when the cable is used? What are its protection measures? How to store it? We have made a summary, as follows:
1. When the cables cross each other, the high-voltage cables should be located under the low-voltage cables. When one of the cables passes through the pipeline protection device or is separated by a partition within 1 meter before and after the cross, the minimum allowable distance is 0.25 meters.
2. When the cable approaches or intersects the hot pipe, the minimum distance between the parallel and cross lines is 0.5m and 0.25m, respectively.
3. When cables traverse railways or highways, pipes should be used for protection, and the pipes should extend beyond the track or road surface by more than 2 meters.
4. The distance between the cable and the building foundation should ensure that the cable is buried outside the loose water surface of the building. When the cable enters the building, pipes should be used for protection, and the protective pipe should also exceed the building's scattered water.
5. The grounding distance between the directly buried cable and the grounding device should be 0.25-0.5 meters, and the buried depth of the directly buried cable should not be less than 0.7 meters, and it should be buried in permafrost.
With the rapid development of buried power cable laying project, the higher requirements for cable protection, cable protection casing is made of polyethylene PE and high-quality steel pipe after sandblasting and shot blasting pretreatment, dipping or painting, heating curing process, it is the most commonly used to protect the wire and cable a kind of electrical insulation tube.
It is widely used because it has good insulation performance, high chemical stability, no rust, no aging, and can adapt to harsh environments.
Using cable protection sleeving to protect cables can achieve the following advantages:
1 Good corrosion resistance, long service life, and can be used in wet and saline areas.
2 Flame retardant, good heat resistance, can be used at 130 degrees for a long time without deformation, and does not burn in case of fire.
3 High strength and high rigidity. Used in direct burial under the traffic lane without adding concrete protection layer, can roll fast cable construction progress.
4 Cable protection casing whether pipe or pipe fittings have a certain flexibility, can resist the damage caused by external heavy pressure and foundation settlement.
5 Has good resistance to external signal interference performance.
6 The inner wall is smooth and does not scratch the cable. The design adopts the socketed connection method, which is convenient for installation and connection. The joints are sealed with rubber seals to adapt to both thermal expansion and contraction, and to prevent mud and sand from entering.
Copyright ? 2010 - 2025 zmscable.com All Rights Reserved.
