A wire is composed of one or several flexible wires with a soft outer covering, and a cable is composed of one or several insulated wires with a tough outer layer of metal or rubber. Cables and wires are generally composed of three parts: core, insulating skin and protective sheath. The characteristics of commonly used 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 chamber wires often use BV, BX, RV, RVV series wires, including: BV - copper core PVC insulated wire, long-term allowable temperature of 65 °C, minimum temperature -15 °C, working voltage AC 500V, DC 1000V, fixed laying indoors, outdoors, can be applied openly or covered. BX - copper core rubber insulated wire, the maximum use temperature is 65 °C, and it is applied indoors. RV - PVC insulated single-core flexible wire, the maximum operating temperature is 65°C, the minimum operating temperature is -15°C, the working voltage is AC 250V, DC 500V, which is used as the internal wiring of instruments and equipment. RVV - copper core PVC insulated and sheathed flexible wire, allowing long-term working temperature 105°C, working voltage AC 500V, DC 1000V, used in wet, high mechanical protection requirements, often moving and bending occasions. In fact, there is no strict boundary between "wire" and "cable". Generally, the products with few cores, small product diameter and simple structure are called wires, those without insulation are called bare wires, and the others are called cables; the conductor cross-sectional area is larger (more than 6 square millimeters) is called large wires, and the smaller ones (less than or equal to 6 square millimeters) are called small wires, and insulated wires are also called cloth wires. Cables generally have more than 2 layers of insulation, most of them are multi-core structures, wound on the cable reel, and the length is generally greater than 100 meters. The wire is generally single-layer insulation, single core, 100 meters in a roll, and no disk. Common types of cables: VV means: PVC insulation (the first V), PVC sheath (the second V); YJV22 means: cross-connected polyethylene insulation (YJ), PVC sheath (V), steel tape Kai (22) The model with "ZR" or "FR" is a flame-retardant cable (wire). Add "L" for aluminum wire. The types of wires are simpler: BVV - PVC insulated and sheathed copper core wire, BV - PVC insulated copper core wire, BYJ - copper core XLPE insulated copper wire, BVR - PVC insulated copper core flexible wire, BX - rubber insulated copper core wire, RHF - neoprene rubber sheathed copper core flexible wire.
The small diameter is called "line", and the large diameter is called "cable".
The simple structure is called "line", and the complex structure is called "cable".
However, with the expansion of the scope of use, many varieties of "cable in the line" and "cable in the cable". So there is no need to make a strict distinction.
In daily habits, people call household cloth wires wires, and power cables are referred to as cables.
Wires and cables mainly include bare wires, winding wires, power cables, communication cables and optical cables, and electrical equipment.
