According to the statistics of the public security fire department, the accident rate of the whole building is about 40% due to the failure of the electric wire and cable itself.
In order to ensure the smooth operation of the electronic and electrical operation system of the modern high-rise building.
And to increase the safety and security of the whole system, the development of wire and cable fire accidents in modern high-rise buildings is discussed as follows.
Most of them are due to the nominal oxidation, looseness and poor contact of the connector contacts of the cable, resulting in increased resistance, overheating or ignition, which causes modern high-rise building fire accidents.
Especially in the modern intelligent building, there are thousands of cables and cable joints.
When the electrical and electronic equipment runs for a long time, the temperature rise of the wires and cables will increase, causing the wire joints and the insulation layer to accelerate aging or damage.
It is extremely prone to overheating and fire accidents.
Human factors are another cause of wire and cable fire accidents.
For example, the operator does not follow the rules and regulations, and the cable or cable is short-circuited due to misoperation.
The load is overloaded, and the surface of the wires and cables is doubled, causing electrical fire accidents.
Because construction and installation leave hidden dangers that are not easy to detect, it will also cause damage to cable and cable fire accidents.
For example, mechanical bending causes the insulation layer to be broken, which may cause cable and cable breakdown during operation, causing electrical accidents caused by arcing.
For example, in the laying of cables and cables in the later stage of construction, the manufacturing process of the junction box (box) does not meet the technical requirements.
Poor material, long time, electrical failure caused by fever such as joints and solder joints.
In high-rise buildings, because wires and cables are laid in bundles on the truss, once the wires and cables are fired, the effect is unimaginable.
Because the insulation layers used in electric wires and cables are all flammable rubber, hydrogen-polymeric compounds such as polyvinyl chloride, the heat generated by such materials is 199000-46000 kJ/kg.
The copper core of the cable has a melting point of about 1038 ° C, and the melting point of the aluminum core is 658 ° C.
However, the melting point of the wire and cable insulation is much lower than these values.
For example, the melting point of the polyvinyl chloride plastic is only 120 ° C.
Electrical fire accidents can also cause other chain accidents.
Abnormally speaking, plastic wires and cables are burning at a high speed, and a large amount of toxic and harmful gases such as hydrogen chloride and carbon monoxide are generated, which causes people to be suffocated and poisoned, and is in danger of dying.
Skills should be taken for the wires and cables in the construction of high-rise buildings.
The buildings, layers and layers, layers and walls, racks and floors, elevator shafts and frames, and control rooms must be strictly protected by fireproof materials.
And they should be tightly sealed so that the flames will not be strung when the wires and cables are gone.
Other orientations.
Wire and cable design selection should be done. Due to the complexity of the construction of wires and cables in ancient high-rise buildings, flame-retardant wires are generally used.
Flame-retardant wires and cables have self-extinguishing and flame-retarding properties.
Its process is made by adding a high-oxygen flame retardant to the insulating layer without affecting the performance of the wire, physical properties and mechanical properties, and the protective layer can be effectively formed.
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