In fact, there is no strict boundary between wires and cables. Generally, products with few cores, small diameter and simple structure are called wires, those without insulation are called bare wires, and others are called cables; The conductor with larger cross-sectional area (more than 6 mm2) is called large wire, the smaller one (less than or equal to 6 mm2) is called small wire, and the insulated wire is also called cloth wire. The wire is composed of one or several soft wires, which are covered with a light and soft protective layer; The cable is composed of one or several insulated conductors, which are wrapped with a tough outer layer made of metal or rubber.


Cables and wires are generally composed of three parts: core wire, insulating sheath and protective sheath.


The characteristics of common cables are as follows:


CEF - ethylene propylene rubber insulation, neoprene sheath, marine flame retardant power cable.


CVV - PVC insulated, PVC sheathed marine flame retardant power cable. BV, BX, RV and RVV series wires are often used for oxygen cabin wires, including:


Bv - copper core PVC insulated wire, with long-term allowable temperature of 65 ℃, minimum temperature of - 15 ℃, working voltage of AC 500V and DC 1000V, which can be fixed indoors and outdoors, and can be laid in open or concealed.


BX - copper core rubber insulated wire, the maximum service temperature is 65 ℃, which is applied indoors.


RV - PVC insulated single core flexible wire, with maximum service temperature of 65 ℃, minimum service temperature of - 15 ℃, working voltage of AC 250V and DC 500V, used as internal wiring of instruments and equipment.


RVV - copper core PVC insulated and sheathed flexible wire. The allowable long-term working temperature is 105 ℃, and the working voltage is 500V AC and 1000V DC. It is used in wet, high mechanical protection requirements, frequent movement and bending.


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