Refractory wire and cable refers to the Shandong wire that can maintain the normal operation of wire and cable and maintain the integrity of the line equipment in the case of wire and cable fire accidents, while the external flame is still burning. Cable manufacturer products.
Fire-resistant wire and cable can be divided into two grades according to national standards: Class A and Class B. Usually expressed as NHA and NHB. Judging whether a wire and cable product belongs to a fire-resistant wire and cable is independent of whether the wire and cable product itself has self-extinguishing properties. The biggest function of the flame-retardant wire and cable is the flame retardancy of the wire and cable products themselves. Fire-resistant wire and cable can usually be operated for at least 180 minutes at a flame temperature of 750-800 °C.