As we all know, the burning and burning of objects must have three elements: flammable, heat and air.
(1) Insulating materials and protective layers for all types of cables that have been widely used so far use flammable organic materials. Although cables with oil, paper, and asphalt as cable materials have been eliminated, many old factories continue to use them. Polyethylene, cross-linked polyethylene, polypropylene, polystyrene, natural rubber, and other materials are used in a large number of cables. The oxygen index of these materials is 19 or less. Generally, they can ignite at 300°C to 400°C. In addition, the amount of heat generated during combustion is greater than that of coal of the same weight. Therefore, the cables made of these materials will not be able to self-extinguish and burn when they catch fire, which is the main cause of the spread of cable fires.
(2) The cable quickly self-extinguished after it caught fire. There are also examples of accidents that do not cause accidents. However, this is mainly due to factors such as cable type, number, number of layers, and environmental conditions.
(3) The old standard tests for single PVC cables showed no flammability, but in the case of large-scale installation of multiple cable groups, once the cables caught fire, a large range of High temperature, resulting in the formation of ductile combustion will not self-extinguishment, in the case of the same amount of air supply, the horizontal laying than the vertical laying of the flame speed and flame propagation speed is smaller.
(4) When a cable emits a large amount of toxic gas in the flue gas when it burns and reaches a certain concentration, it will damage human health and cause death.
(1) Insulating materials and protective layers for all types of cables that have been widely used so far use flammable organic materials. Although cables with oil, paper, and asphalt as cable materials have been eliminated, many old factories continue to use them. Polyethylene, cross-linked polyethylene, polypropylene, polystyrene, natural rubber, and other materials are used in a large number of cables. The oxygen index of these materials is 19 or less. Generally, they can ignite at 300°C to 400°C. In addition, the amount of heat generated during combustion is greater than that of coal of the same weight. Therefore, the cables made of these materials will not be able to self-extinguish and burn when they catch fire, which is the main cause of the spread of cable fires.
(2) The cable quickly self-extinguished after it caught fire. There are also examples of accidents that do not cause accidents. However, this is mainly due to factors such as cable type, number, number of layers, and environmental conditions.
(3) The old standard tests for single PVC cables showed no flammability, but in the case of large-scale installation of multiple cable groups, once the cables caught fire, a large range of High temperature, resulting in the formation of ductile combustion will not self-extinguishment, in the case of the same amount of air supply, the horizontal laying than the vertical laying of the flame speed and flame propagation speed is smaller.
(4) When a cable emits a large amount of toxic gas in the flue gas when it burns and reaches a certain concentration, it will damage human health and cause death.
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