Fire-resistant power cables are cables that can maintain safe operation for a certain period of time under flame combustion conditions, used in fixed installation locations with fire resistance requirements. According to the national standard GB12666.6, their fire resistance tests are divided into Class A (950～1000℃, 90 minutes) and Class B (750～800℃, 90 minutes). The conductor is usually made of copper core, and the fire-resistant layer is mainly composed of mica tape wrapping.
Products mainly include flame-retardant fire-resistant wires and cables, non-flame-retardant fire-resistant wires and cables, and mineral-insulated fire-resistant cables, among which mineral-insulated cables have particularly outstanding fire resistance performance. They are widely used in high-rise buildings, subways, large power plants, and other places related to fire safety. In model designation, fire resistance characteristics are usually indicated by a prefix of "N" or "NH".
