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New Consumer Unit Necessary?

Robert Garrett

We are having our conservatory replaced with a more substantial "garden room". The electricity in the conservatory was a spur off a current ring main, and the new room will be the same. The electrician says we must have the current consumer unit (which is plastic and has no RCDs being ~30 years old) replaced in order for the work to be certified. We had the system checked a few years ago and although advised a new consumer unit would be better, told it was not a legal requirement.

So do regulation require a new consumer unit with RCDs for this ring spur to be re-added, or is he being over cautious?

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  • 0

    Why can't you just extend the existing ring?  Extent the loop ring from where the fused spur is currently. this assumes the fused spur in on the ring. Peter

  • 0 in reply to Phow

    If the existing ring circuit does not have 30mA RCD protection it could not be simply extended. Making a new ring from a single fused spur is pointless you would need an RCD spur for both legs of the ring ( if earth continuity R2 is lost and a fault occurs it's a 50% chance whether it will trip the RCD or not depending on what side of the RCD its on. Unless you plan to run sizeable heaters a 13A  radial power circuit would be plenty for table lights, TV, etc.

  • 0 in reply to Phow
    Phow said:
    Extent the loop ring from where the fused spur is currently. this assumes the fused spur in on the ring.

    Who said anything about a fused spur? However, SRCDs may still be available. We discussed them 4 years ago: engx.theiet.org/.../omitting-30ma-rcd-protection-for-single-s-o-in-a-domestic-property

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