In fact, there is no strict limit between 'wires' and 'cables. Usually, products with a small number of cores, small diameters, and simple structures are called wires, and bare wires without insulation are called bare wires; others are called cables; Larger (greater than 6 square millimeters) are called large wires, and smaller ones (less than or equal to 6 square millimeters) are called small wires, and insulated wires are also called cloth wires.
The wire consists of one or several soft wires, and the outer bread is made of a soft protective layer; the cable is made up of one or several insulated wire and is covered with a tough outer layer made of metal or rubber. Cables and wires are generally composed of three components: a core wire, an insulating sheath and a protective sheath. The characteristics of common cables are as follows: CEF - Ethylene-propylene rubber insulated neoprene sheath, marine flame-retardant power cable. CVV - PVC insulated, PVC sheathed marine flame retardant power cable. Oxygen cabin wires often use BV, BX, RV, RVV series wires, of which: BV - copper core PVC insulated wire, long-term allowable temperature 65 ° C, minimum temperature -15 ° C, working voltage AC 500V, DC 1000V, fixed laying Indoors and outdoors, it can be applied or concealed. BX - copper core rubber insulated wire, the maximum temperature is 65 ° C, applied indoors. RV - PVC insulated single-core cord, the maximum operating temperature is 65 ° C, the minimum operating temperature is -15 ° C, the working voltage is AC 250V, DC 500V, used for internal wiring of instruments and equipment. RVV - copper core PVC insulated and sheathed flexible wire, allowing long-term operating temperature of 105 ° C, working voltage AC 500V, DC 1000V, for wet, high mechanical protection requirements, often moving and bending occasions. In fact, there are no strict boundaries between "wires" and "cables."
Generally, a product with a small number of cores, a small product diameter, and a simple structure is called a wire, a non-insulated wire is called a bare wire, and the other is called a cable; a conductor having a large cross-sectional area (greater than 6 square millimeters) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire, and insulated wire is also called a wire. It is simple and easy to understand!! Cables generally have more than 2 layers of insulation, most of which are multi-core structures, wound around the cable tray. Above, the length is generally greater than 100 meters.
The wires are generally single-layer insulated, single-core, 100-meter-volume, wireless disk. Common cable types: VV: PVC insulation (first V), PVC sheath (second V) YJV22 means: cross-linked PVC insulation (YJ), PVC sheath (V) , steel belt Kai (22) model plus "ZR" or "FR" for the flame-retardant cable (wire). Adding "L" to the aluminum wire is simpler: BVV--PVC insulated and sheathed copper core wire, BV--PVC insulated copper core wire, BYJ--copper core cross-linked polyolefin insulated wire, BVR--PVC insulated copper core cord, BX--rubber insulated copper core wire, RHF--chloroprene rubber copper core cord.