first,Dongguan CableWhy is there a short circuit? People with electrical knowledge understand that in the practical use of wires and cables, short circuits are caused by various reasons. Among them, improper selection of wire and cable cross-sections, excessive electrical loads, unauthorized connection of power lines, poor handling of wire and cable joints, and aging or damage to the wire and cable themselves are the most direct causes of wire and cable short circuits. The so-called "short circuit caused by wire heating and insulation melting" is mainly related to these factors, rather than the insulation resistance of wires and cables. At the press conference of wire and cable inspection results, the quality supervision department usually lists quality issues such as "small conductor size", "use of recycled copper", "use of reverse groove plastic", and "thickness not meeting standards". And these charges are basically unrelated to short circuits. The structural and performance indicators in the standards for wire and cable products leave some room for error. Even if the conductor is smaller and the insulation is thinner, as long as the specifications and wiring are selected correctly according to electrical regulations, it generally will not cause a short circuit. As for the use of recycled copper, it is feared that this charge cannot be established in countries around the world. Various countries are vigorously recycling and using recycled copper. There are probably only a few manufacturers who truly use the original 1 # electrolytic refined copper to make electrical products, while the vast majority mix old and new copper materials for refining. Why do we have to demand the use of primitive electrolytic copper for wires and cables?

Secondly, can flame-retardant wires and cables prevent the spread of large fires? The determination of flame retardant performance of flame-retardant wires and cables refers to the length of burning and self extinguishing in accordance with the specifications, laying and installation methods, and specified intensity of open flames of the wires and cables. The standard for flame retardant testing of wires and cables stipulates that after removing the fire source, the wires and cables continue to burn for a certain distance and then self extinguish to be qualified. In buildings, even if flame-retardant wires and cables are used, when the wires and cables only burn a few meters long in the early stages of a fire and then self extinguish, they can still ignite other combustible materials around them. For example, in luxurious KTV nightclubs, almost all the decoration materials are combustible and the amount used is huge. The lobby, corridors, and walls of the rooms are all covered with combustible materials. Moreover, in fierce building fires, almost all organic building materials and items are reduced to ashes, and even steel beams can melt, rendering any flame-retardant wires and cables useless. Therefore, when searching for the cause of a fire, in addition to understanding the aforementioned short circuit situation, do not focus on the flame retardant performance of wires and cables, especially since many buildings do not use flame retardant wires and cables. The safest way to prevent the spread of fire in wires and cables is to use fire sensing and automatic sprinkler devices, or bury all wires and cables in walls or install them in iron pipes.

Thirdly, is the toxic gas emitted from wires and cables in fires? In the April 1982 Falklands War, multiple British warships were hit and caught fire, with thick smoke poisoning many people and severely corroding electronic equipment on board. In April 1996, a major fire broke out at Dusseldorf Airport in Germany, resulting in 16 deaths and 60 injuries. The airport's electronic equipment suffered severe corrosion and damage. These two fires made Europeans realize the importance of using low smoke halogen-free wires and cables instead of PVC wires and cables. Since then, countries around the world have followed suit, and low smoke and halogen-free wires and cables have emerged. Today, their research and application momentum has become increasingly fierce. However, American scientist Stephen Sandall pointed out that "among the building materials used in buildings, not only PVC can burn, but also PVC can emit toxic gases and smoke. Other building materials may be more serious; as for the toxicity of gases, carbon monoxide gas (CO) is more toxic than hydrogen chloride gas (HCL), why hasn't anyone said it?" During a technical exchange with Tom Burke, a senior technical expert at a Norwegian cable company, I also pointed out that "PVC wires and cables emit toxic halogen gases when they burn, while CO gas emitted when other organic substances burn is more toxic, so it is not reasonable to only attack PVC. However, the development trend is like this, and wire and cable manufacturers can only follow the situation. The sentence is:. This is the evaluation of so-called low smoke halogen-free cables by British and American scientists.

At this point, it should be understood that frequent fires have brought shame to the wire and cable industry for many years. Especially in society, there is almost a consensus that the casualties and losses in building fires are caused by inferior wires and cables. Small and medium-sized wire and cable enterprises are the creators of inferior wire and cable products. Therefore, small and medium-sized wire and cable enterprises have an inescapable responsibility for building fires and should be severely cracked down on. What I am saying here is not to not crack down on counterfeit and inferior wire and cable products, but to call on relevant departments to clarify the true causes of electrical fires in buildings, so as to carry out effective comprehensive fire prevention and control, rather than just focusing on wire and cable products and this industry.