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What is the shelf life of wire and cable?

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  • Time of issue:2020-03-29 20:55
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(Summary description)The national standard wire and cable generally have no shelf life, but there will be a cable life. And this period depends on the materials used, generally not more than 20 years.

What is the shelf life of wire and cable?

(Summary description)The national standard wire and cable generally have no shelf life, but there will be a cable life. And this period depends on the materials used, generally not more than 20 years.

  • Categories:company news
  • Author:
  • Origin:
  • Time of issue:2020-03-29 20:55
  • Views:
Information
  
 
The national standard wire and cable generally have no shelf life, but there will be a cable life. And this period depends on the materials used, generally not more than 20 years.
Electric wire is composed of one or several soft wires, covered with a light and soft sheath; cable is composed of one or several insulated coated wires, and then covered with a tough outer layer of metal or rubber. Cables and wires are generally composed of three parts: core wire, insulation sheath 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 cabin 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 either indoors or outdoors, either in the open or in the dark. BX——Copper core rubber insulated wire, the maximum service temperature is 65 ℃, and it should be used indoors. RV——PVC insulated single-core flexible wire, the maximum operating temperature is 65 ℃, the minimum operating temperature is -15 ℃, the working voltage is 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 of 105 ℃, working voltage AC 500V, DC 1000V, used in places with high humidity, high mechanical protection requirements, frequent movement and bending. In fact, there is no strict boundary between "wire" and "cable". Products with a small number of cores, a small product diameter, and a simple structure are generally called wires, those without insulation are called bare wires, and others are called cables; those with a larger conductor cross-sectional area (greater than 6 square millimeters) are called big 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 2 layers of insulation, and most are multi-core structures that are wound around the cable reel Above, the length is generally greater than 100 meters. The wire is generally single-layer insulated, single-core, 100 meters in one roll, wireless reel. Common cable models: VV means: PVC insulation (first V), PVC sheath (second V) YJV22 means: cross-linked PVC insulation (YJ), PVC sheath (V) , Steel belt Kaiser (22) Models with "ZR" or "FR" are flame retardant cables (wires). It is simpler to add "L" for aluminum wire: BVV--PVC insulated and sheathed copper core wire, BV--PVC insulated copper core wire, BYJ--copper core crosslinked polyolefin insulated wire, BVR--PVC insulated copper core cord, BX--rubber insulated copper core cord, RHF--chloroprene sheathed copper core cord.

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