Fire-resistant cables refer to cables that can maintain safe operation for a certain period of time when the cable is on fire or an external fire source is on fire, that is, to maintain the integrity of the circuit and have the power supply capacity for a certain period of time. The classification of flame retardant grades should consider the importance of the occasion of use and the degree of hazard after a fire is caused, such as nuclear power plants, subway stations, terminal buildings, engine rooms of ships, heart systems of thermal power plants, etc., important places or lines Use high flame retardant cables.
The ABC category of flame-retardant cables is classified according to the GB/T18380-2008 standard and is used to evaluate the ability of vertically installed bundles of wires and cables or optical cables to inhibit the vertical spread of flame under specified conditions. It can be distinguished according to the volume of the cable combustible and the burning time of the fire source, the flame retardant grade ZA>ZB>ZC.
Flame-retardant Class A: The test capacity of the cable is 7L/m, the fire time is 40 minutes, the flame temperature is 815 degrees, after the cable burning stops, wipe the sample dry, the coking height is less than 2.5m, and the self-extinguishing time is less than or equal to 60 minutes.
Flame retardant type B: the test capacity of the cable is 3.5L/m, the fire time is 40 minutes, the flame temperature is 815 degrees, after the cable burning stops, wipe the sample dry, the coking height is less than 2.5m, and the self-extinguishing time is less than or equal to 60 minutes .
Flame-retardant Category C: The test capacity of the cable is 7L/m, the fire time is 20 minutes, and the flame temperature is 815 degrees. After the cable burning stops, wipe the sample dry, the coking height is less than 2.5m, and the self-extinguishing time is less than or equal to 60 minutes.
If you want to learn more, please visit our website What Is Asynchronous Motor, 3phase Synchronous Motor, Yb Motors.