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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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    I know like for like replacement is classed as maintenance and a MEIWC isn't required.

    I'd go back and check that if I were you - most folk will disagree ;-)

    The whole point of the MWC is that relatively little testing needs to be done but not none at all and it is intended to cover the 'like for like' repairs.

    Even as part of a true like for like, say a new but identical light switch to replace one smashed by careless furniture removal, if you find something that would be a showstopper on an EICR, such as the example of no earth for a metal bodied fitting, then your minor works is incomplete, and just got slightly bigger. Either lock it off dead or fix it properly.

    You may decide that the scope of tests  can be trimmed to no more than a quick flash with the Zs meter or an general meter on  ohms check a continuity to something else known to be earthed, and a then a L-N polarity check, but in anything more than DIY in your own home, there probably should be at least some tests like that. Similarly as a bare bones minimum  the 3 lights plug in socket tester should probably be brought out after a socket swap - it is possible to get the polarity wrong or the CPC clamped on the insulation.

    Mike. 

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  • 0

    I know like for like replacement is classed as maintenance and a MEIWC isn't required.

    I'd go back and check that if I were you - most folk will disagree ;-)

    The whole point of the MWC is that relatively little testing needs to be done but not none at all and it is intended to cover the 'like for like' repairs.

    Even as part of a true like for like, say a new but identical light switch to replace one smashed by careless furniture removal, if you find something that would be a showstopper on an EICR, such as the example of no earth for a metal bodied fitting, then your minor works is incomplete, and just got slightly bigger. Either lock it off dead or fix it properly.

    You may decide that the scope of tests  can be trimmed to no more than a quick flash with the Zs meter or an general meter on  ohms check a continuity to something else known to be earthed, and a then a L-N polarity check, but in anything more than DIY in your own home, there probably should be at least some tests like that. Similarly as a bare bones minimum  the 3 lights plug in socket tester should probably be brought out after a socket swap - it is possible to get the polarity wrong or the CPC clamped on the insulation.

    Mike. 

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