Flame retardant wire and cable, its flame retardant means that when a wire and cable fire accident occurs, it can block and delay the spread and extension of the flame along the wire and cable, and minimize the expansion of the wire and cable fire range. This type of cable has a self-defense after fire. The characteristics of extinguishing. Generally, it can be understood that when the wire and cable product catches fire by itself or by an external heat source, after the fire source subsides, the wire and cable product no longer burns, or the burning time is very short.
Fire-resistant wire and cable means that in a wire and cable fire accident, the wire and cable product can maintain normal operation for a certain period of time while the external flame is still burning, maintain the integrity of the wire and cable circuit and maintain the normal operation of the line equipment.
Both fire-resistant cables and flame-retardant cables are suitable for wiring of control, signal, protection and measurement systems with a rated voltage of 750V and below.
The structure and materials of fire-resistant cables are different from those of flame-retardant cables. The basic structure of flame-retardant cables is:
(1) The insulating layer is made of flame-retardant materials.
(2) The sheath and outer sheath are made of flame-retardant materials.
(3) The wrapping tape and filling are made of flame-retardant materials.
Fire-resistant cables usually add a fire-resistant layer between the conductor and the insulating layer, so theoretically, a fire-resistant layer can be added to the structure of the flame-retardant cable to form a flame-retardant and fire-resistant cable. Because of the fire-resistant layer of fire-resistant cables, multi-layer mica tapes are usually used to wrap the wires directly. It can withstand long-term burning, even if the polymer at the place where the flame is applied is burned, it can ensure the normal operation of the line.