Fire resistance refers to the operation of a certain time in the case of flame combustion, that is, to maintain the integrity of the circuit, this type of cable has a certain time of power supply in the flame.
Fire-resistant cables can be divided into two grades according to the national JIA test standard (GB12666-99) : NHA, NHB; In the general product naming, NHA is usually represented by GNH, which is called high fire resistant cable. NHB is expressed as NH in general refractory products.
Fire-resistant cables can continue to work (transmit current and signals) in the event of a fire, and whether they themselves are burned or not is not included in the assessment. The flame-retardant cable stops working quickly in the event of a fire, and its function is that it is flame resistant and can self-extinguish without spreading.

Main uses of fire-resistant cable
It is mainly used in high-rise buildings, underground railways, nuclear power plants and important industrial and mining enterprises and places related to fire safety and fire rescue, such as emergency power supply to indoor fire equipment, fire alarm equipment, signal lights, ventilation and smoke exhaust equipment, emergency elevator power supply lines.
Use characteristics: Fire-resistant cable (wire) is a cable that can still keep the line running normally for a certain period of time in the case of combustion. The difference between it and the usual flame-retardant wire and cable is that in the event of a fire, it can still transmit electrical energy to facilitate the evacuation of people and rescue important equipment.