Some electrical installation workers often do not pay attention to the installation quality when laying wires: no bushing is installed where insulating sleeves should be used; junction boxes are not installed where junction boxes should be used; even splicing is not used at wire joints , But the illegal hook 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. 1. Reasons for accidents at joints There are always many connection points on electrical lines. Such as wires and wires, wires and switches, wires and electrical appliances wiring pile heads, wires and protection device connection points, etc.

These joint parts are different from other parts of the wire. 1. Prone to touch wires. Wires generally have insulation protection. As long as the insulation is not damaged, even if the two wires touch, there will be no problems. At the joint, the insulating layer is stripped off. If the wrapping cloth is not properly wrapped and the two wires collide, it may cause a short circuit, heat generation or electric spark. 2. It is easy to generate heat due to excessive contact resistance.

If Box header Factory measures are taken at the joints in time, it cannot be ‘seamless’. If the contact area is smaller than the conductor cross-sectional area, according to the inverse ratio of resistance and conductive area, it can be known that the smaller the contact area of the connection point, the greater the resistance; the greater the resistance, the easier it is to generate heat. Therefore, the joint is always easier to heat than other parts of the conductor. If the quality of the joint is good, the heat generated is not large, the heat dissipation condition is good, the heat is quickly dissipated, and the temperature of the connection point will not rise too high and cause an accident.