Cable gland are also called cable heads. After the cable is laid, in order to make it a continuous line, the various segments must be connected as a whole, and these connection points are called cable gland.
The cable gland in the middle of the cable line is called the middle joint, and the cable gland at the two ends of the line is called the terminal head. The cable gland is used to lock and fix the incoming and outgoing wires, playing the role of waterproof, dustproof and shockproof.
Some electrical installation workers often do not pay attention to the installation quality when laying wires: no bushing is installed where insulation sleeves should be used; junction boxes are not installed where junction boxes should be used; even splicing is not used at cable joints , But the illegal hook-like connection method.
The contact resistance of this hook-like connection method is very large, and the continuous heating when the power is turned on will gradually dry and carbonize the nearby wooden boards, and finally burn and cause a fire.