Fire resistance means that it can maintain operation for a certain period under the condition of flame burning, that is, to maintain the integrity of the circuit, and this type of wire can supply power for a certain period in the flame. Fire-resistant wires can continue to work (transmit current and signals) in the event of a fire, and whether they are delayed or not is not included in the assessment. The flame-retardant wire stops working quickly when a fire occurs, and its function is to be flame-retardant and self-extinguishing without spreading. The fire-resistant wire can maintain normal operation for 180 minutes in the flame burning of 750~800°C.NH-BV fire-resistant wire is suitable for fire-resistant occasions where the rated voltage is 450/750V and below, and the wire is required to keep running for a certain period in the event of fire.NH-BV is to add a layer of refractory mica tape to the core of BV line, which is used for the development of industrial systems and the lines in key factories with concentrated urban functions and multi-purpose important buildings integrating storage, office, and residence.