TOP FIVE CABLING PROBLEMS
Contractors should ensure that the cable supplied by the distributor or wholesaler is the correctly specifi ed cable.
4. STRIPPABILITY
Sometimes due to a manufacturing fault, cables are found to be unstrippable. Installers should check their cable is strippable before fi rst fi x installation. If cable has been laid and plastering or decoration has been completed, when the installer comes to fi t accessories at second fi x and the cable cannot be stripped easily, there can be serious diffi culties which will cost the installer both time and money. Strippability can be readily checked by feeling the free end of each reel of cable
with a fi ngernail to check if the sheath and bedding can be lifted away from the cores. If it will not come away from the cores easily, then normal stripping of the cable should be attempted. If it is diffi cult to strip without damaging the insulation material, affected cable should be returned to the supplier.
5. MARKINGS
Often it is not until cables are installed and tested that a problem is discovered and by then it can be
too late to avoid the enormous cost of rectifying the situation. Contractors should ensure that the cable supplied by the distributor or wholesaler is the correctly specifi ed cable and check the markings on the cable sheath − not just the packaging. When assessing cable markings look in particular for a recognisable or known manufacturer’s identifi cation, so if there is a problem it will help in tracing the cable back through the supply chain. Without a manufacturer’s stamp it is nearly impossible to trace the cable, therefore never accept cable with no origin markings. For peace of mind, contractors should also insist on an independent third party approved cable with marking such as BASEC, HAR or equivalent. It is also important to specify on your order the British or European standard number the cable should conform to.
i
Dr Jeremy Hodge has been the chief executive of the British Approvals Service for Cables (BASEC) since 2005. Prior to joining BASEC, Jeremy was with the Building Research Establishment and the Loss Prevention Council working on a range of approvals and technical projects including innovative housing, security and fi re protection, safety and environmental issues. With a PhD in chemical physics from Oxford University, Jeremy has previously worked with British Petroleum, where he worked on oil exploration projects, and ICI Fibres, where he worked in the quality assurance test laboratory.
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