... wires of 450/750V and below are mainly applied for hard wiring of electrical appliances, electric apparatus 1, brief introduction ... cables of 450/750V and below are mainly applied for hard wiring of electrical appliances, electric apparatus, instruments, telecommunication equipment ... RV, RVV, BVV, 2, the long, allowable working temperature for wiring wires and cables such as BV, BLV, BVR, BVVB, BLVVB ...