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8 metre meter tails

Pete Murphy
Hello All,

Scenario is; conversion of basement with a 3P supply to 3 separate flats. TNCS. To get a new CU into the furthest flat I've proposed 25mm singles in Scottish Power red conduit. The conduit would be run in the correct zone in a void about 100mm above a plasterboard ceiling with no insulation at this point. I get the max current to 80A for this method and a fused switch would be installed at the origin after the DNO cut out Have I missed anything here? I'd assume to measure volt drop to the origin and disconnection times to the CU as per.

Thanks for your time,

Pete
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    For the avoidance of a 30mA  RCD in a silly place, assuming not TT supply, then  metal trunk (2 by 2 inch or so should do it) may be a more forgiving choice of enclosure, as you can earth the trunking, and do not have to bury it so deep into the walls. (even then TT and a 100mA slow RCD and then trunking is an option that is less trippy than 30mA at origin, especially as resetting could mean going into another flat by the sound of it  which does not sound sensible.)

    And if the meters go to a switch fuse per flat, even with the same fuse rating as the DNO fuse, you can then say 'there ends the DNO fuse responsibility' and do what you like after that without the DNO getting too fussy, and it is a jolly good idea for maintenance and/or if one flat falls vacant and needs to be isolated leaving the rest of the building on.
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  • 0
    For the avoidance of a 30mA  RCD in a silly place, assuming not TT supply, then  metal trunk (2 by 2 inch or so should do it) may be a more forgiving choice of enclosure, as you can earth the trunking, and do not have to bury it so deep into the walls. (even then TT and a 100mA slow RCD and then trunking is an option that is less trippy than 30mA at origin, especially as resetting could mean going into another flat by the sound of it  which does not sound sensible.)

    And if the meters go to a switch fuse per flat, even with the same fuse rating as the DNO fuse, you can then say 'there ends the DNO fuse responsibility' and do what you like after that without the DNO getting too fussy, and it is a jolly good idea for maintenance and/or if one flat falls vacant and needs to be isolated leaving the rest of the building on.
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