What are the hazards caused by unqualified wires and cables?
Wires and cables are a large class of electrical products used to transmit power, transmit information and realize electromagnetic energy conversion. The quality of wires and cables directly affects our daily lives.
Consumers who use substandard products are prone to the risk of leakage, electric shock or even fire. These inferior products pose many hidden dangers to the normal operation of the power system.
1. After a single-phase grounding (short circuit) accident occurs in wires and cables, the relay protection device fails to operate and cuts off the fault, causing the wires and cables to overheat and cause the insulation layer to spontaneously ignite.
2. The unqualified tensile strength and elongation of the insulating sheath before aging will directly greatly shorten the working life of the wire and cable.
3.Wires with unqualified conductor resistance increase the loss when the current passes through the line and intensify the heating of wires and cables. It may cause fire during use.
4. If wires and cables are often overloaded or over-voltage due to use, the thickness of the insulation layer is not up to standard, and the installation is improper (such as the bending radius of the cable is too small, the diameter of the wire protection tube is too small), etc., it may cause accidents. .
5. When the sheath and insulation thickness of the cable does not meet the standard, the electrical strength of the wire and cable will be seriously reduced, resulting in a shortened service life of the wire and cable. In severe cases, it may cause the wire and cable to be broken down and the insulation (sheath) layer cannot be lifted. To prevent normal protection, electrical short circuits and fires may occur.
