Unqualified wires and cables pose a significant risk. Are you still using them
2022-10-25(4160)Views
Wire and cable are a large category of electrical products used for transmitting power, information, and electromagnetic energy conversion. During the random inspection process, a large number of substandard products were discovered, which laid many hidden dangers for the normal operation of the power system. 1. Unqualified wires and cables marked. Signs are the main way to identify the basic information of products when using wires and cables. According to standard regulations, the main content of the signs is: product model, specification, standard number, factory name, place of origin, etc. Within a certain distance between the signs. When the signs are not qualified, it can cause identification errors by construction personnel, and in severe cases, it can lead to electrical accidents. 2. Wire and cable with unqualified structural dimensions. The main issue with structural dimensions is the thickness of the sheath and insulation. When the sheath and insulation thickness of the cable do not meet the standard, the electrical strength of the wire and cable will be affected
Wire and cable are a large category of electrical products used for transmitting power, information, and electromagnetic energy conversion. During the random inspection process, a large number of substandard products were discovered, which laid many hidden dangers for the normal operation of the power system.
1. Unqualified wires and cables marked. Signs are the main way to identify the basic information of products when using wires and cables. According to standard regulations, the main content of the signs is: product model, specification, standard number, factory name, place of origin, etc. Within a certain distance between the signs. When the signs are not qualified, it can cause identification errors by construction personnel, and in severe cases, it can lead to electrical accidents.
2. Wire and cable with unqualified structural dimensions. The main problem with structural dimensions is the thickness of the sheath and insulation. When the sheath and insulation thickness of the cable do not meet the standard, the electrical strength of the wire and cable will be severely reduced, leading to a shortened service life of the wire and cable. In severe cases, it can lead to the breakdown of the wire and cable, and the insulation (sheath) layer cannot play a normal protective role, resulting in electrical short circuits and fires.
3. Wire and cable with qualified tensile strength and elongation before aging of sheathed insulation. The unqualified tensile strength and elongation of the insulation sheath before aging directly shortens the working life of wires and cables. Moreover, during construction or in environments with prolonged electrification and high temperatures, insulation breakage is prone to occur, resulting in exposed live conductors and the risk of electric shock short circuits. The main reason for its disqualification is the use of recycled materials for production to reduce product costs, and the second reason is that small enterprises do not have production qualifications.
4. Wire with unqualified conductor resistance. The conductor resistance is mainly an important indicator for assessing whether the conductor material and cross-section of wires and cables meet the requirements. When the conductor resistance exceeds the limit, it increases the loss of current passing through the line, exacerbating the heating of wires and cables. The main reason for the unqualified conductor resistance is that in order to reduce costs, enterprises shrink the copper material, which accounts for 80% of the raw material cost, either reduce the cross-sectional area of the conductor or use recycled copper with high impurities. This causes the conductor resistance of wires and cables to seriously exceed the standard. In addition to easily causing fires during use, it also accelerates the aging of the insulation layer wrapped around the wires.
During the process of purchasing wires and cables, consumers should pay attention to the following items:
Firstly, observe the appearance of the wires. The insulation (sheath) layer of qualified products is soft, resilient, and stretchable, with a tight, smooth surface layer and no roughness. If the plastic wrapping the wires is easily peeled off, there is a problem of insufficient plastic strength.
Secondly, it depends on the cross-section of the wires. The copper or aluminum core surface of qualified products should have a metallic luster, and blackened copper or white aluminum on the surface indicates oxidation.
Thirdly, when purchasing wires, attention should be paid to checking the quality certificate. If the quality of the wire is qualified, then the wire quality should also be inspected and there should be no major problems.
Taisheng Electric Wire inherits the genes of high-tech industrial cables, elevating the safety, environmental protection, and durability of wire products to a new level - more flame retardant. The wire core uses 99.99% high-purity oxygen free copper, with lower heat generation and faster flame retardant insulation layer, which can better ensure the safety of public life and property than ordinary wires; More heat-resistant, using irradiation cross-linking technology, the cable product can operate at a high temperature of 125 degrees Celsius, which has a longer lifespan than ordinary wires with a heat-resistant temperature of 70 degrees Celsius; More environmentally friendly, the product uses Low smoke zero halogen and non-toxic environmental insulation materials.
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