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Obvious departures from the regulations at first glance at a new consumer unit.

Jaymack
I was asked to give an EICR on an domestic property which is to be placed on the market (part P applicable). I found that a builder as part of the other renovation work, (new doors, windows and kitchen etc.) has carried out the installation of a new metal consumer unit. On first opening this dual RCD unit, the 2 lighting circuits were on one R.C.D., and the 2 final ring circuits on the other R.C.D,, it was obvious also, that some wires to the new CB's were short and not lengthened, resulting in a bird's nest at the M.C.B.''s.


Plainly, a qualified electrician hadn't carried out the work. What would the readers as registered electricians have done ?. 1. Walk away. 2. Propose to have an E.I.C.R. carried out (UNSATISFACTORY), then carry out the rectification work and issue MWC's.3. Rectify the obvious departures, issue M.W.C.'s and then issue a SATISFACTORY E.I.C.R. 


Jaymack
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    AncientMariner:


    Is there a requirement for MCBs to have reducing ratings working away from the RCD? ie, in reverse order: 40, 32 , 32......16,..6, 6  Or just common practice?

    There is the argument of having the heaviest currents flowing through the shortest length of the busbar, but this is also dependent upon the amount of current consumed by each circuit which can vary. Current density will always be highest at the supply end of the busbar regardless of the ordering of the MCBs.


    Another argument is having the MCB for the lighting circuit in the room of the CU at the far end so you can easily feel its position when it trips during the hours of darkness.
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  • 0

    AncientMariner:


    Is there a requirement for MCBs to have reducing ratings working away from the RCD? ie, in reverse order: 40, 32 , 32......16,..6, 6  Or just common practice?

    There is the argument of having the heaviest currents flowing through the shortest length of the busbar, but this is also dependent upon the amount of current consumed by each circuit which can vary. Current density will always be highest at the supply end of the busbar regardless of the ordering of the MCBs.


    Another argument is having the MCB for the lighting circuit in the room of the CU at the far end so you can easily feel its position when it trips during the hours of darkness.
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