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Old and new electric cable colours to comlete ring main

Postby geezer01 » Sun May 25, 2014 11:53 pm

Hi guys just a simple question. When replacing some floorboards I cut part way through into some old electrical wiring for the ring main. The colours were red, black and yellow/green for 'earth'.

I have taken that section of cable out in between the sockets. My question is do I have to use the older style red/black cable or can I use the modern blue/brown cables to complete the ring?
Thanks in advance!
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Simply Build It

Postby ericmark » Mon May 26, 2014 5:21 pm

Oddly the same question was asked on another forum so easy answer.

Appendix 7
2.1 An addition or alteration made to a single-phase installation need not be marked at the interface provided that:

i) the old cables are correctly identified by the colour red for line and black for neutral, and
ii) the new cables are correctly identified by the colour brown for line and blue for neutral.

Read more: ... z32qKQIqhr
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Postby proptech » Mon May 26, 2014 5:24 pm


It's OK to use the new colour cable. Ideally a warning label should be stuck to the consumer unit, but i wouldn't worry too much.
You wouldn't be able to obtain the old colour cable in any case.
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