There are many kinds of bad contact of wires. I believe many people have also encountered it. The common one is that the wires and sockets are not well connected. This kind of situation will lead to tripping and power failure, or short circuit and fire. No matter what kind of situation, we should pay more attention to prevent and avoid it. So what kind of situation is there in bad contact of wires? Let's take a stock, Let's avoid stepping on thunder.
1. Poor contact between wire and socket
Among all the fire causes of poor contact, the fire caused by excessive short circuit resistance at the socket is the most common. If there is loose contact at the junction of the electrical circuit, the voltage between the contacts is enough to break through the air gap, form an arc, burst out sparks, ignite nearby combustibles, and form a fire. This situation will also lead to abnormal voltage, so sometimes the appliance will react when it is used, but it can not be used normally. It may also be the cause of poor contact of the socket.
2. Poor contact of wire connector
电线接头虽然用胶布之类的处理过,但可能会因为发热等问题导致胶布老化,如果在同- -位置多过一个接头存在也会更容易造成短路、 漏电等问题存在。
Although the wire connector has been treated with adhesive tape, the adhesive tape may be aged due to heating and other problems. If there is more than one connector at the same location, it will also easily cause short circuit, leakage and other problems.
3. Poor contact of electrical equipment
Due to the violation of wiring mode, weak connection, poor maintenance, or poor conductivity oxide film at the joint during long-term operation, or vibration and heat action of the joint, some electrical appliances loose and oxidize at the joint, resulting in excessive contact resistance.
Although the above three situations often occur. But the results are basically the same
1、 The contact point of the conductor is heated violently, which increases the resistance of the contact point and aggravates the heating.
2、 The heating of the conductor will cause the plastic insulation material outside the conductor near the contact point to be heated, greatly reducing its insulation capacity and causing electric leakage.
3、 If the copper core of the wire is heated violently and melted. The wire will break. When it breaks, it will produce "generating arc" and further damage the insulation, which will aggravate the leakage and cause the wire short circuit to the ground. We call it a single phase to ground fault.