Electric line

The wire is composed of one or a plurality of soft wire coated with soft sheath; the cable is made from one or a plurality of insulating wire. The outside package with metal or rubber for the tough outer layer. Cables and wires are generally composed of three parts, the core wire, insulated wrapping and protective outer sheath. Common cable characteristics are as follows: CEF - ethylene propylene rubber insulated polychloroprene sheathed flame retardant power cable for ship. CVV - polyvinyl chloride insulated, PVC sheathed flame retardant power cable for ship. Oxygen wire used by BV, BX, RV, RVV series wire, including: BV copper core PVC insulated wire, allowed 65 degrees Celsius temperature, the lowest temperature of -15 DEG C, the working voltage of 500V AC, DC 1000V, fixed installed on the inside and outside, can be laid can also be concealed. BX - copper core rubber insulated wire, the maximum use temperature of 65 degrees Celsius, deposited in the room. RV: single core PVC insulated flexible cord, maximum use temperature of 65 DEG C, the minimum temperature of -15 DEG C, the working voltage of 250V AC, DC 500V, used as the internal wiring of instruments and equipment. RVV - copper core PVC insulated and sheathed soft wire, allowing long-term operating temperature of 105 degrees, the working voltage of AC 500V, DC 1000V, used for wet, mechanical protection requirements are high, often moving and bending occasions. In fact, "wire" and "cable" and there is no strict boundaries. Usually the small number of core products in diameter, simple structure of the product was called wire, no insulation called bare wire, the other called the cable; the conductor cross-sectional area larger (greater than 6 mm2) called wire, the smaller (less than or equal to 6 mm2) called small wires, insulated wire is also known as wire cloth that is relatively simple, easy to understand!! there are 2 cable insulation layer above, most of them are multi core structure, wound on the cable tray, typically greater than 100 meters in length. Wire is generally a single layer of insulation, a single core, 100 meters a roll, wireless disk. Cable common type: VV said: (first V) PVC insulation, PVC sheath (second V) YJV22 said: cross-linked PVC insulation, PVC sheath (YJ) (V) (22), steel tape armoured models with "ZR" or "FR" for flame retardant cable (wire). Add "L" for aluminum wire model is relatively simple: BVV-- PVC insulated and sheathed copper wires, BV-- PVC insulated copper heart line, BYJ-- copper core cross-linked polyolefin insulated wire, BVR-- PVC insulated copper heart line, BX-- rubber insulated copper heart line, RHF-- chloroprene rubber copper heart line.

The electric wire and cable is composed of four parts, the conductor, the insulating layer, the shielding layer and the protective layer. conductor A conductor is a conductive part of a wire and cable that is used to transport electrical energy and is a major part of the wire and cable. Insulation layer The insulation layer is the conductor and the earth and the different phases of the conductor in the electrical isolation between each other, to ensure that the power transmission, is an indispensable part of the structure of the wire and cable. Shielding layer 15KV and above wire and cable generally have the conductor shield layer and the insulation shield layer. Protective layer The protective layer protects the electric wire and cable from the intrusion of external impurities and moisture, as well as the protection of the power cable from direct damage to the external force.