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What are the hazards of unqualified wires and cables

Release time:

2023-11-15 11:01

Wire and cable is a large class of electrical products used to transmit power, transmit information and realize electromagnetic energy conversion. Wire and cable play an important role in all economic activities and social life. It can be said that where there are people living, where there are production, transportation and all economic activities, are inseparable from the wire and cable, so the quality of wire and cable directly affects our lives.

Unqualified products, the main problem lies in the structure, conductor size, conductor resistance, insulation and sheath tensile strength before aging, consumers use such products, prone to leakage, electric shock and even the risk of fire, these inferior products to the normal operation of the power system buried many hidden dangers.

After the single-phase grounding (short circuit) accident of the 1. wire and cable, the wire and cable overheating caused by the failure of the relay protection device to cut off the fault, resulting in spontaneous combustion of the insulation layer.

2. wire and cable with qualified tensile strength and elongation before sheath insulation aging. The unqualified tensile strength and elongation of the insulating sheath before aging directly shorten the working life of the wire and cable, and in the construction or in the environment where the power is energized for a long time and the temperature is high, it is easy to break the insulator, resulting in the live conductor Exposed, the risk of electric shock type short circuit occurs.

3. wires with unacceptable conductor resistance. Conductor resistance is mainly an important indicator for assessing whether the conductor material and cross-section of the wire and cable meet. When the conductor resistance exceeds the standard, it increases the loss when the current passes through the line, and aggravates the heating of the wire and cable. The reason for the unqualified conductor resistance is mainly that in order to reduce the cost, the enterprise shrinks the copper material, which accounts for 80% of the raw material cost, either reduces the cross-sectional area of the conductor or uses recycled copper with excessive impurities, thus causing the conductor resistance of the wire and cable to exceed the standard seriously. In addition to easily causing fire in the use process, it will also accelerate the aging of the insulating layer wrapped in the wire.