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CATAGORY: Home -> Cable-News -> What’s the steel wire armoured cable?

What’s the steel wire armoured cable?

Steel wire armoured cable, commonly abbreviated as SWA, is a hard-wearing power cable designed for the supply of mains electricity. It is one of a number of armoured electrical cables ,which include 11 kV Cable and 33 kV Cable, and is found in underground systems, power networks and cable ducting.

The typical construction of an SWA cable can be broken down as follows:

1. Conductor: consists of plain stranded copper (cables are classified to indicate the degree of flexibility. Class 2 refers to rigid stranded copper conductors as stipulated by British Standard BS EN 60228:2005)

2. Insulation: Cross-linked polyethylene (XLPE) is used in a number of power cables because it has good water resistance and excellent electrical properties. Insulation in cables ensures that conductors and other metal substances do not come into contact with each other.

3. Bedding: Polyvinyl chloride (PVC) bedding is used to provide a protective boundary between inner and outer layers of the cable.

4. Armor: Steel wire armor provides mechanical protection, which means the cable can withstand higher stresses, be buried directly and used in external or underground projects.The armoring is normally connected to earth and can sometimes be used as the circuit protective conductor ("earth wire") for the equipment supplied by cable.

5. Sheath: a black PVC sheath holds all components of the cable together and provides additional protection from external stresses.

SWA cable can be referred to more generally as mains cable, armoured cable, power cable and booklet armoured cable. The name power cable, however, applies to a wide range of cables including 6381Y, NYCY, NYY-J and 6491X Cable.

The use of the armor as the means of providing earthing to the equipment supplied by the cable is a matter of debate within the electrical installation industry. It is sometimes the case that an additional core within the cable is specified as the CPC or an external earth wire is run alongside the cable to serve as the CPC. Primary concerns are the relative conductivity of the armoring compared to the cores and reliability issues.

And for the SWA Cable, the steel wire braid provides effective physical protection for the cable, so that the cable can work in harsh environments and withstand high mechanical tension.So that the SWA Cable applications cover electrical systems installed in dry or humid rooms, especially in industrial environments. Suitable for use as a measurement, monitoring and control cable for use in machine tool manufacturing, complete sets of equipment installation works, power stations, heating and air conditioning systems, refrigeration equipment, office automation equipment, and data processing systems require strict electrical safety.