2007-11-22
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, on RCD neutral-phase orientation in split-load boards, is answered by the ECA:
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| RCDs - which way the phase & neutral? |
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Question: I want to change a main switch in a split-load board to a 100mA RCD so that I can achieve (a split load board) of 100ma and 30ma. I have found that the phase and neutral are the wrong way round on my new RCD, but have been told that it is possible to change the phase and neutral over - it doesn't matter which way round they go in. Is this correct?
Answer: Yes, I think that is correct with most RCDs. I would, however, suggest that you should with the manufacturer concerned, so as to be sure.
Managing Editor James Hunt adds: The 17th Edition of the IEE Wiring Regulations will be published on January 1st 2008, and will come into force on July 1st 2008. Whilst this will not affect the terms of the above question, and its answer, it may have an effect on how split-load boards are arranged. A particularly important change in the 17th Edition (Chapter 41) concerns socket-outlets in the domestic environment. Extra protection is now required for all socket-outlets - for automatic supply disconnection. Specifically, in AC systems, such additional protection is to be provided by using an RCD (I Delta N not exceeding 30mA). Such RCDs will be provided for the following:
- Socket outlets not exceeding 20A rating for use by ordinary persons and intended for general use, and mobile equipment not exceeding 32A rating for use outdoors.
- Mobile equipment not exceeding 32A rating for use outdoors.
Therefore, essentially, every domestic room now requires RCD protection for each socket, though there is, apparently, some debate about the best way of achieving the required protection.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: http://www.voltimum.co.uk/consult.php?universe=consult.index.questions
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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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Source: ECA & James Hunt |
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