The quality of wires and cables directly affects our lives.
The main problems with unqualified products lie in their structure, conductor size, conductor resistance, tensile strength of insulation and sheath before aging. Consumers who use such products are prone to the risk of leakage, electric shock, and even fire. These low-quality products pose many hidden dangers to the normal operation of the power system.
1、 After a single-phase grounding (short circuit) accident occurred in wires and cables, the relay protection device failed to cut off the fault, causing the wires and cables to overheat and causing the insulation layer to self ignite.
2、 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 the exposure of live conductors and the risk of electric shock in short circuits.
三、导体电阻不合格的电线。导体电阻主要是考核电线电缆的导体材料以及截面是否符合的重要指标。当导体电阻超标时，就增大了电流在线路上通过时的损耗，加剧了电线电缆的发热。导体电阻不合格的原因，主要是企业为了降低成本，将占原材料成本80%的铜材缩水，要么降低导体的截面积，要么使用含杂质过高的再生铜，这样致使电线电缆的导阳雕刻 手套生产设备 果树反光膜 北京纯水设备 保定网站制作 排水槽模具
3、 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 enterprises shrink the copper material, which accounts for 80% of the raw material cost, in order to reduce costs. They either reduce the cross-sectional area of the conductor or use recycled copper with high impurities, which 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.