A wire is composed of one or several soft wires with a light and soft sheath; a cable is composed of one or several insulated wires, and the outside is covered with a tough metal or rubber outer layer. Cables and wires generally consist of three parts: core wire, insulating sheath and protective sheath. The characteristics of commonly used cables are as follows: CEF-ethylene propylene rubber insulated neoprene sheath, flame-retardant power cable for ships. CVV-PVC insulated, PVC sheathed flame-retardant power cable for ships. Oxygen chamber wires often use BV, BX, RV, RVV series wires, among which: BV--copper core PVC insulated wire, long-term allowable temperature 65℃, minimum temperature -15℃, working voltage AC 500V, DC 1000V, fixed laying It can be applied both in the open and in the dark. BX--Copper core rubber insulated wire, with a maximum operating temperature of 65°C, for laying indoors. RV--Polyvinyl chloride insulated single-core flexible cord, maximum operating temperature 65℃, minimum operating temperature -15℃, working voltage AC 250V, DC 500V, used as internal wiring of instruments and equipment. RVV-copper core PVC insulated and sheathed flexible wire, allow long-term working temperature 105 ℃, working voltage AC 500V, DC 1000V, used in humid, high mechanical protection requirements, frequent movement and bending occasions. In fact, there is no strict boundary between "wire" and "cable". Generally, products with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and the others are called cables; those with a larger conductor cross-sectional area (greater than 6 square millimeters) are called large wires. Small (less than or equal to 6 square millimeters) are called small wires, and insulated wires are also called cloth wires. This is relatively simple and easy to understand! Cables generally have more than two layers of insulation, most of which are multi-core structures, wound on the cable reel, and the length is generally greater than 100 meters. Wires are generally single-layer insulated, single-core, 100-meter rolls, wireless disks. Common cable types: VV means: PVC insulation (the first V), PVC sheath (the second V); YJV22 means: cross-linked polyethylene insulation (YJ), PVC sheath (V) , Steel belt Kaizhuang (22) The model number with "ZR" or "FR" is flame-retardant cable (wire). Add "L" for aluminum wire. The wire model is relatively simple: 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 cord, RHF--chloroprene rubber sheathed copper core cord.
(2) The smaller diameter is called "line"; the larger diameter is called "cable".
(3) The simple structure is called "line"; the complicated structure is called "cable".
But with the expansion of the scope of use, many varieties "cable in the cable" and "cable in the cable". So there is no need to make a strict distinction.
In daily habits, people call household cloth wires a wire, and power cables abbreviate to cables.
Wires and cables mainly include bare wires, winding wires, power cables, communication cables and optical cables, and electrical equipment.
