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Shocking Protection from LSX Cable

20 February 2018

Have you nailed your cable selection? It is a serious question because if you damage some live electrical cables with a nail, screw, or similar metal spike the resulting electric shock could prove fatal. Prysmian LSX cable can dramatically reduce that risk.

Prysmian’s LSX is the original screened wiring cable. It was developed to improve installation times for lighting and power distribution in buildings.

Aluminium Protection
LSX cable is manufactured with an internal layer of aluminium. This acts as a screen so that when LSX is used as part of a power circuit the earthed screen protects adjacent data circuits from corruption. The effect of the aluminium layer also acts as a 360-degree electrostatic screen protecting its signal from corruption from nearby power circuits. 

It is this layer of metal that also gives the cable robust mechanical protection. The aluminium screen is bonded to the cable’s thermoplastic over-sheath to make a light, but strong composite. The innovation enables LSX cable to be used indoors in place of small, surface-mounted armoured cables, and surface-mounted outdoor installations, saving installation time and money.

Importantly, the aluminium screen has also been designed to ensure the installation remains safe, should the insulation of a live conductor be spiked by a nail or some other metal fixing. This is because the laminated aluminium tape is in contact with a full size circuit protective conductor of tinned annealed copper, which will carry the fault current for long enough to allow a circuit breaker to operate and isolate the live cores from the supply.

Cable Testing
Prysmian’s LSX cable is certified by BASEC and meets the nail penetration test requirements of the current cable specification in BS8436:2011. To perform the test, the cable is energized in the test rig. A 1.6mm diameter steel nail is then driven through the screen and into the conductor by a 900g weight, falling from a height of 400mm, this process is repeated six times. A pass for the cable is given if all six samples can maintain the fault current for 1 second or longer and the voltage measured on the nail is less than 25V. If you are in any doubt ask your cable provider to provide the proof of the cable passing the nail penetration test, such as a BASEC test certificate. 

This enhanced safety feature makes LSX ideal for use in plasterboard partition walls and ceilings, beneath laminate floors or for other applications where the cable is located close to the surface where there is a potential for damage from nails and the like. It meets the requirements of the 17th and the forthcoming 18th edition of the Wiring Regulations for installation of electrical cables in thin walls and partitions.

For more information see the Afumex LSX Cable data sheet.

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