Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning 100A sub-mains cable to be run under floorboards and hidden in the wall, is answered by the ECA:
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| Nexans’ Alsecure NXS cable with aluminium sheathing. |
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Question: In terms of the 17th Edition, what cable do I have to use as 100A sub-mains if it is run under floorboards and hidden in the wall (less than 25mm from the surface)? Also, as this is the only supply to the flat, should I put an RCD on this cable? If so, which type (ie: trip current and time delay or not?)
Answer: If you really have to run the cable concealed less than 25mm from the surface of a wall, you should use one of the methods that doesn't require RCD protection, such as a cable with an earthed metallic sheathing, or possibly mechanical protection (at least 3mm thick metal).
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Related contacts
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Electrical Contractors' Association (ECA)
ECA Head Office, ESCA House,
34 Palace Court, London W2 4HY
Tel: 020 7313 4800
Fax: 020 7221 7344
Email: electricalcontractors@eca.co.uk
Web: www.eca.co.uk |
ECA
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