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Domestic Installer - a scheme that covers general electrical installation work in UK domestic properties only

Sergio Fernandez

Domestic Installer - a scheme that covers general electrical installation work in UK domestic properties only.  But what if the dwelling has 3 phase due to size of house or for Solar PV or EV (Electric Vehicle or HP (Heat Pump)?


Eg 

Single phase safe isolation 3 point test at 230v AC nominal

3 phase 10 point test but at some point phase 1 to phase two at potentially 400v AC


As always please be polite and respectful in this purely academic debate.





Come on everybody let’s help inspire the future

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  • In some parts of the country the policy seems to be to install 3-phase for domestics by default now - to cater for future EVs, Heat Pumps etc.

    Some network faults (lost Ns) can potentially put 400V or so across single phase supplies - so that's something that the equipment and procedures should handle anyway.

      - Andy.

  • in reply to AJJewsbury

    The CPS's say Domestic Installer is only 230v in dwelling like house/flat thus if 3PH gets fitted this will leave people having stern conversations.

    https://niceic.com/for-the-trades-1/professional-standards/schemes/domestic-installer-scheme/

  • in reply to Sergio Fernandez

    The CPS's say Domestic Installer is only 230v

    where does it say that? (seems odd, since part P will certainly cover many 3-phase (even some 460V split phase) installations).

       - Andy.

  • in reply to Sergio Fernandez

    "The CPS's say Domestic Installer is only 230v "
    Seems like a serious weakness of the Nic DI scheme, if that is true, - its a totally spurious limit, and they might just as well say they can only work on 5/6A lighting ccts and 13A socket stuff for example and not do CU changes or cookers and showers, as those are probably higher risk items.

    Think more generally, then as observed it is likely to have to change.

    Mike.

  • in reply to mapj1
    mapj1 said:
    "The CPS's say Domestic Installer is only 230v "

    Three-phase TPN with earthed neutral is only 230 V to Earth ... in fact, as discussed elsewhere, the supply is still derived from 230/400V TPN supply.

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  • in reply to mapj1
    mapj1 said:
    "The CPS's say Domestic Installer is only 230v "

    Three-phase TPN with earthed neutral is only 230 V to Earth ... in fact, as discussed elsewhere, the supply is still derived from 230/400V TPN supply.

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