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How To Differentiate The Flame-retardant And Refractory Of The Cable!
Jul 17, 2017

Flame-Retardant cable means: under the prescribed test conditions, the specimen is burned, after the removal of the fire source, the flame spread only within the limited range, residual flame or residual burning in the limited time to extinguish the cable itself. Its basic characteristics are: In the case of fire may be burned to run, but can prevent the spread of the fire. Generally speaking, the cable in case of fire, can limit the combustion in the local scope, do not produce the spread of other equipment, to avoid causing greater loss.

The structure of the flame-retardant cable is basically the same as that of the ordinary cable, except that its insulating layer, sheath, outer layer and auxiliary material (packing and filling) are all or part of the flame retardant material.

Fire-resistant cable means: under the prescribed test conditions, the specimen is burned in the flame and can maintain its normal operating performance for a certain period of time. Its fundamental characteristic is that the cable can maintain the normal operation of the line for a period of time under burning condition. Popularly speaking is, in case of fire, the cable will not burn, the circuit is relatively safe.

The structure of the fire-resistant cable is basically the same as that of the ordinary cable, except that the conductor of the fire-resistant cable adopts a copper conductor with good fire resistance (the melting point of the copper is 1 083 ℃), and a refractory layer is added between the conductor and the insulating layer. The refractory layer is formed by the multiple cloud mother belt wrapping. Because the different mica belt's allowable working temperature difference is big, therefore the cable fire resistance performance key is the Mica belt.

Therefore, the main difference between fire-resistant cable and flame-retardant cable is that the fire-resistant cable can maintain a normal power supply for a period of time while the fire-retardant cable does not have this characteristic. This feature determines that fire-resistant cables play an important role in modern urban and industrial buildings.
Because once the fire occurred, control, surveillance, guidance and alarm system power supply circuit must maintain normal operation. Therefore, the cable is mainly used in emergency power supply to the user fire equipment, fire alarm equipment, ventilation exhaust equipment, guide lights, emergency power sockets, emergency elevators and other power supply circuit.