The commonly used models of fire alarm wires include 1RVV, RVVP: copper core PVC insulated PVC sheathed flexible wire/shielded flexible wire, mostly used for connecting power lines and transmission lines of electrical appliances and instruments. The full name of RVS wire is copper core PVC insulated stranded connection flexible wire, twisted multi-strand flexible wire, referred to as twisted pair, commonly known as "flower wire". . Uses of RVS twisted pair: 1. It is mostly used for detector lines of automatic fire alarm systems. 2. Suitable for household appliances, small electric tools, instruments and meters and power lighting lines. Double white cores are used for direct connection to lamp head wires; red and blue cores are used for fire protection, alarms, etc.; red and white cores are used for broadcasting and telephone lines; red and black cores are used for broadcasting lines.