![]() Recent articles by authoritative sources have analysed the practice in detail and concluded that, for the majority of situations, the armouring is adequate to serve as the CPC under UK wiring regulations. ![]() Primary concerns are the relative conductivity of the armouring compared to the cores (which reduces as the cable size increases) and reliability issues. It is sometimes the case that an additional core within the cable is specified as the CPC (for instance, instead of using a two core cable for line and neutral and the armouring as the CPC, a three core cable is used) or an external earth wire is run alongside the cable to serve as the CPC. The use of the armour as the means of providing earthing to the equipment supplied by the cable (a function technically known as the circuit protective conductor or CPC) is a matter of debate within the electrical installation industry. Use of armour for earthing cable with light armouring This would induce an electric current in the steel wire, which could cause overheating. A magnetic field is produced by the current in a single core cable. This is because the aluminium is non-magnetic. When cable has only one core, aluminium wire armour (AWA) is used instead of steel wire. A multicore cable, as the name suggests, is one where there are a number of different cores. Steel wire armour is only used on multicore versions of the cable. The name power cable, however, applies to a wide range of cables including 6381Y, NYCY, NYY-J and 6491X Cable. SWA cable can be referred to more generally as mains cable, armoured cable, power cable and booklet armoured cable. It is known as SWA BS 5467 Cable and it has a voltage rating of 600/1000 V. The PVC version of SWA cable, described above, meets the requirements of both British Standard BS 5467 and International Electrotechnical Commission standard IEC 60502.
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