Cable is usually made of several or groups of wires [at least two per group] stranded into a rope-like cable, each group of wires insulated from each other, and often twisted around a center, the entire outer cover with a highly insulating cover.
Many erected in the air or installed in the ground, underwater, for telecommunications or power transmission. 1832, the Tsarist Russian retired officer Hüringer buried the telegraph line in the ground, six wires insulated from each other with rubber and then placed in a glass tube, which is the world's first underground cable.
Extended information
Cable joints main problems:
Joints heat causes some electrical installation workers in the laying of wires, often do not pay attention to the installation
Quality in the should be insulated casing is not installed at the casing, should be used in the place of the junction box is not equipped with junction boxes, and even in the wire joints is not the use of stranded method, but the use of unauthorized curved Hooked connection method.
The contact resistance of this hooked connection method is very high, and when the electricity is energized, the heat is constantly generated, which will make the nearby wooden boards gradually dry, charring, and finally burning, causing a fire.
Heating wire joints will not only cause a large amount of power loss, but also seriously affect the normal operation of electrical equipment, light is the line in the increase in working current, shorten the life of electrical equipment, or suddenly interrupt the ongoing production, scientific research, medical surgery and other activities, but also caused by fires and electrocution accidents, etc., resulting in incalculable losses.
Installation can be divided into indoor and outdoor two kinds, according to the production and installation of materials can be divided into heat-shrinkable, dry pack, epoxy resin casting type and cold shrinkable, according to the core material can be divided into copper-core power cable head and aluminum-core power cable head.
According to the joint material is divided into plastic cable glands and metal cable glands. Metal cable glands are divided into porous metal cable glands, anti-bending metal cable glands, double locking metal cable glands, plastic hose cable glands, metal hose cable glands and so on.
Reference:
Responded on 2018-12-05
Approved 31
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