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Like for like requirements

Hi, I know like for like replacement is classed as maintenance and a MEIWC isn't required. With an alteration to a circuit the new work has to comply with the latest BS7671, so some of the existing installation will need to comply also to allow the new work to comply, like RCD (if required), bonding, existing equipment rating and condition etc.

Am I right in thinking that for like for like this is not required? So if there was no bonding or RCD protection you could still change a light fitting for example.

What if there was no CPC at the light and you were fitting a class 1 or class 2 fitting? Or getting crazy, no CPC on a socket front change?

Thanks.

Parents
  • A failed test on an existing circuit where new work has been added would need rectifying for the new work to comply. But is this not the case for 'like for like'? If we accept that the circuit has no CPC or RCD but we are making it no worse, do we do the same for a failed IR test, or is the test not needed.

    Only the new work, not all of the circuit, needs to be up to current standards. So for things like IR tests, if you test before and after, and the result is no worse, you can be reasonably confident that the IR of your new work is OK (ideally test your new piece in isolation too).

       - Andy.

Reply
  • A failed test on an existing circuit where new work has been added would need rectifying for the new work to comply. But is this not the case for 'like for like'? If we accept that the circuit has no CPC or RCD but we are making it no worse, do we do the same for a failed IR test, or is the test not needed.

    Only the new work, not all of the circuit, needs to be up to current standards. So for things like IR tests, if you test before and after, and the result is no worse, you can be reasonably confident that the IR of your new work is OK (ideally test your new piece in isolation too).

       - Andy.

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