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Flame retardant cable do not burn?

by:AAA     2020-05-31
( Industry news] Flame retardant cable do not burn? W P ZR is the abbreviation of flame retardant wire and cable in the wire and cable, which means to prevent burning ZRBV, ZRYJV, ZRYJLV, these ZR series wire and cable are many, and flame retardant wire and cable is really not burning? This is certainly not possible because the outer insulation of wire and cable are generally use electrical resistance good PVC material, and this kind of material can be burned, so why is there this type flame retardant wire and cable? In order to ensure that in the case of fire, flame retardant cable can limit the combustion in the local scope, does not produce spread, hold on to the other all sorts of equipment, avoid causing a greater loss, so in the normal use of adding flame retardant insulation materials to reduce the combustion performance of outer insulation of wires and cables. Flame retardant cable is according to the needs of actual production in recent years, developed with flame retardant properties of the cable, the product applicable to the distribution of power system are fixed installation places that have requirements of flame retardant requirement. For example, cable tunnels, cable interlayer, main control room, command center, and other important occasions. Flame retardant cable structure and ordinary cable, no different. In terms of use of various materials, in addition to used in the cable around the bag belt change for flame retardant belt, outer sheath used PVC sheathed change for PVC flame retardant sheath material, the rest are accordingly with ordinary type of cable is exactly the same. Fire test standards and requirements according to cable fire retardant properties, flame retardant cable into a bunch of combustion, the flame temperature than ℃, min for fire time, its hard to requirement is: stop for fire, burns out should be natural; Then wipe samples and ignore any softening of non-metallic materials and deformation, measuring the sample (carbide Burning) Should not exceed the length of the mm. Visible flame retardant cable has meet a small fire burning range, and away from the fire can self-extinguishing characteristic. Is not flame retardant cable will not burn. When a current flows through a conductor, because of the existence of conductor resistance will cause conductor heating, this phenomenon is called the heating effect of the current. Using the current heating effect, can be made into all kinds of heating appliances, such as: electric stove, electric welding machine, oven, electric, electric iron, etc. , this is the current heating effect beneficial. But in many cases, the heating effect of the electric current is harmful. Such as transformer, motor and cable in the run, because the current heating effect can make the fever, if not through the current limit, the device will be damaged due to the temperature exceeds the limits of the allowed. http / / cqqldx。 com/newsdetail_。 html
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