BASEC issues warning about arctic grade cable
The recent freezing temperatures across the country have highlighted the issue of the performance of cables in the cold. The British Approvals Service for Cables (BASEC) has independently tested samples of selected ‘arctic grade’ cables.
The sheathing and insulation of certain cables were found to disintegrate when subjected to a cold bending test.
This problem could result in a fire, short circuit or an electric shock, warns BASEC. The products in question also exhibited poor conductor resistance and other faults.
BASEC has therefore issued a warning about ‘arctic grade’ cable supplied into the UK market. The cable - which is usually coloured yellow or blue - is commonly used on construction sites and other outdoor applications for temporary power supplies, and in some indoor applications such as cold stores.
This type of cable is widely sold through distributors and wholesalers across the UK. Sometimes it is made into pre-assembled leads with plugs or sockets. Identification of problem cable may be difficult, as many brands of such cable are sold, often with no brand name or mark of origin. Only certain cables are affected, and none are BASEC approved or marked BASEC.
According to BS 7540-3 (Cables - guide to use), cable compliant with BS 7919 Table 44 is suitable for outdoor use in harsh environments, down to -25°C, and to demonstrate this performance it is required to be cold tested at -40°C. Regular flexible cable compliant with BS 6500 Table 27 is cold tested at -15°C and is only described as suitable for indoor use down to +5°C.
Jeremy Hodge, chief executive for BASEC said: "This cable is used under harsh environmental conditions and needs to withstand rough treatment, so it is important to know that it is safe. Cable claiming ‘arctic grade’ performance needs to be suitable for use down to -25°C, and therefore needs to be tested at -40°C. There is cable on the market claiming to be ‘arctic grade’ which has been shown to have inadequate performance to be safe."
BASEC is urging users to check the marking of any ‘arctic grade’ cable in use and if concerns are raised to contact the supplier. When purchasing new ‘arctic grade’ cable, users are encouraged to make sure that it has passed cold tests at -40°C.
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