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Like for like requirements

Jimi

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.

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  • 0

    If you replace a light switch in an existing installation you may not actually do any testing and just write the the Minor Works Certificate out recommending upgrades and improvements.

    An insulation test may not be reasonable or practical, there may not be a circuit protective conductor or RCD to test.

    Even if there is a circuit protective conductor and RCD it’s only a loop test and just one RCD test, pressing the button twice on a tester is hardly over demanding.

  • 0 in reply to Sparkingchip

    OK thanks, I assumed that issuing a MEIWC for 'like for like' would require performing all tests listed, including Ze and disconnecting bonding cables to test with long leads. I'm still not sure what would be required. I usually check Zs and polarity. Which tests would you perform and would you mark the rest as LIM?

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  • 0 in reply to Sparkingchip

    OK thanks, I assumed that issuing a MEIWC for 'like for like' would require performing all tests listed, including Ze and disconnecting bonding cables to test with long leads. I'm still not sure what would be required. I usually check Zs and polarity. Which tests would you perform and would you mark the rest as LIM?

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