Armoured Cable BS5467, BS6724, IEC 60502, BS6622, BS7835

http://www.armouredcable.co.uk/[8/7/2014 3:01:44 PM]

ARMOURED CABLES BS5467, BS6724, IEC 60502, BS6622, BS7835

Armoured Cables

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Armoured CablesWhat is armoured cable?Armoured cable is the name given to any electrical cable constructed with a layerof aluminium wire armour or steel wire armour. The armour sits below the sheathof the cable to provide protection for the conductor and insulating layers.

Why is cable armoured?When electrical cable is required for use outside or in direct burial projects, itmust have mechanical protection. Aluminium wire armour or AWA, and steelwire armour or SWA, provide such protection as well as enabling the cable towithstand higher pulling loads.

What types of armoured cables are there?AWA and SWA are used in the following power cables:

SWA Cable PVCSteel Wire Armoured Cable or SWA Cable, is a hard-wearing mains electricitycable with class 2 stranded copper conductors, XLPE (Cross-LinkedPolyethylene) insulation, PVC (Polyvinyl Chloride) bedding, aluminium or steelwire armour and a black PVC sheath. SWA Cable is sometimes referred to asBooklet Armoured Cable, Mains or Power Cable. The voltage rating of an SWACable is 600/1000V. Find out more

SWA Cable LS0HThe low smoke zero halogen or LS0H, version of SWA Cable is constructed inexactly the same way as the PVC SWA Cable with copper conductors, XLPEinsulation and aluminium or steel wire armour. The only difference is that LS0HSWA Cable has LS0H bedding and an LS0H sheath. LS0H SWA Cable is used inpublic areas because the sheath only emits very low levels of smoke and non-toxic levels of halogen gas when exposed to fire (usually under 0.5% HClemission).Find out more.

11kV Cable PVC11kV Cable is a power cable with armouring and a series of screens. Its class 2stranded plain copper conductors are surrounded by a conductor screen made ofsemi-conducting material. This screen is then covered with a layer of XLPEinsulation and an insulation screen also made up of a semi-conducting material.Between the insulation and armour, 11kV Cable has a copper tape metallicscreen, a PETP (Polyethylene Terephthalate) filler, binding tape separator andPVC bedding. A layer of aluminium or steel wire armour sits over the bedding covered by a red or black PVC sheath. The voltage rating of an 11kV Cable is6350/11000V.

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Armoured Cable BS5467, BS6724, IEC 60502, BS6622, BS7835

http://www.armouredcable.co.uk/[8/7/2014 3:01:44 PM]

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More information onArmoured Cable

11kV Cable LS0HThe low smoke zero halogen 11kV Cable has the same number and type oflayers as the PVC version. For the 11kV Cable to be used in public areas it musthave LS0H bedding and an LS0H sheath. Voltage rating 6350/1100V.

33kV Cable 33kV Cable is made up of the same individual layers as a PVC 11kV Cable. Theonly difference is that the voltage rating on a 33kV Cable is 19000/33000V.

Click here to find out more about 11kV and 33kV Cables

With which British Standards do armoured cables comply?Where SWA Cable is concerned, BS5467 and BS6724 are the British Standardsthat specify requirements for construction, and describe methods of testing forthermosetting insulated, armoured cables with rated voltages of 600/1000V and1900/3300V. BS6724 applies to those cables that produce lower levels of smokeand corrosive products when exposed to fire in specified tests.

Both 11kV Cable (PVC) and 33kV Cable comply with BS6622, whereas 11kVCable (LS0H) meets the requirements of BS7835. The BS6622 and BS7835standards look at the specifications and test methods for the construction,dimensions and mechanical and electrical properties of thermosetting insulated,armoured cables with voltage ratings of 3800/6600V up to 19000/33000V.

All armoured cables related to these standards are used in fixed installations inindustrial areas and buildings.

What is the difference between AWA and SWA?A single core armoured cable will always have a layer of aluminium wire armour(AWA) instead of steel wire armour (SWA). This is because the steel in SWA hasa much lower conductivity and therefore higher resistance than aluminium. Ifit were used in a single core cable the magnetic field generated would induce anelectric current in the armour (eddy current) and combined with the increasedresistance would have a heating effect. AWA is non-magnetic and has a muchbetter conductivity (lower resistance), so can conduct these induced currents toearth more efficiently than steel. SWA is used in multicore armoured cablesbecause the electromagnetic fields from the neighbouring cores effectively canceleach other out, meaning less current is induced into the armour.

What industries use armoured cables? Youll find armoured cables in everything from transmission, power anddistribution networks and the renewable energy sector to the oil, gas andpetrochemical, water treatment and transport industries. In railway networks, forexample, SWA Cable supplies power to those areas not listed as trackside and33kV and 11kV Cables distribute power between substations (33kV is used overlonger distances).

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