Under the regular experimental conditions, the fire-resistant cable can still operate normally after the sample is extinguished in the flame for a certain period of time. Flame retardant cable Under regular experimental conditions, the sample is extinguished. After removing the experimental fire source, the flame spread is only within the limited range, and the residual flame or residual burning can extinguish itself within the limited time. Now let's know in detail whether the fire resistance and flame retardancy of cables are the same?
Fire-resistant cable
1. Fire resistant cable refers to the performance that the sample can still maintain normal operation within a certain time after being extinguished in the flame under regular experimental conditions. Its basic characteristic is that the cable can still maintain the normal operation of the line for a period of time when it is extinguished. To put it simply, in case of fire, the cable will not be extinguished immediately, and the circuit is relatively safe.
2. Structural characteristics of fire-resistant cable The structure of fire-resistant cable is basically the same as that of ordinary cable. The difference is that the conductor of fire-resistant cable adopts copper conductor with good fire-resistant performance (copper melting point is 1083 ℃), and a fire-resistant layer is added between the conductor and the insulating layer. The refractory layer is wrapped with multilayer mica tape. As the allowable working temperature of different mica tapes varies greatly, the key of fire resistance of cables is mica tape.
Flame retardant cable
1. Flame retardant cable refers to the cable that, under regular experimental conditions, the sample is extinguished, after removing the experimental fire source, the flame spread is only within the limited range, and the residual flame or burning can extinguish itself within the limited time. Its basic characteristic is that it may be burnt out and cannot operate under fire conditions, but it can prevent the spread of fire.
2. Briefly speaking, in case of fire, the cable can be extinguished within a certain range without spreading, and other equipment can be preserved to prevent greater loss. The construction characteristics of flame-retardant cable The structure of flame-retardant cable is basically the same as that of ordinary cable, the difference is that its insulation layer, sheath, outer sheath and auxiliary materials (tape wrapping and filling) all or part of them use flame-retardant materials.
