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on inspection of the electrical installation of a "refurb" property. 2 up 2 down terrace. .the lighting ccts on the board (2) are protected by a 10A MCb
is this acceptable or sholuld i recommend thayre down graded to 6A? also there are 2 feeds out from each of the two mcbs..effectively making 2 light ccts from each
position.....can i let this go, or of course i can introduce two more mcbs and split them at the board.
 
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telectrix

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10A MCB could be a problem with 1.0mm cable if that cable is run in insulation. otherwise, it's OK (good with 1.5mm even if in some insulation).nothing wrong with dropping it to 6A unless the load current exceeds this value. and it's quite common to have 2 light circuits from 1 MCB. check that it's not wired as a ring though if you intend to split it.
 
O

oldtimer

Also check for a shared neutral but when I see this in a board its because someone has added a new circuit but with no spare way they double up the lights
 
on inspection of the electrical installation of a "refurb" property. 2 up 2 down terrace. .the lighting ccts on the board (2) are protected by a 10A MCb
is this acceptable or sholuld i recommend thayre down graded to 6A? also there are 2 feeds out from each of the two mcbs..effectively making 2 light ccts from each
position.....can i let this go, or of course i can introduce two more mcbs and split them at the board.
The MCB is there to protect the cable, so if it is adequately sized, considering all derating factors, then it is safe. (see tel's answer)
The lighting should be split across the RCD's so that you don't lose all lighting at once if one RCD trips. As for 2 cables in one MCB... again acceptable if cables are suitably rated, though not ideal practice. Also, the 2 cables in one RCD will be classed as one circuit.
Sorry to sound patronising, but if you are asking questions of such a basic nature, I would question whether you should be carrying out this inspection.
 
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  • #5
might be basic but i like to be 100% correct when it comes to inspecting. we all started somewhere and from what ive seen and read on here there is often some disparity as to what is acceptable/correct/ or strictly by the book. as for 10a mcbs ..with such a small load...2 or 3 lamps (energy saving) per cct...they could justifiably be downsized...however i want to strike a balance between increasing the remedial cost...and there are several items that need remedial work! and allowing what is acceptable. many thanks however for thet advice. regards ap
 
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  • #6
BTW...the lighting is spilt over 2 rcds..however as they are paired in their respective mcbs. i wont be splitting them.. even though i agree with the above that it isnt best practice.:tt1:
 

Des 56

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BTW...the lighting is spilt over 2 rcds..however as they are paired in their respective mcbs. i wont be splitting them.. even thoughi agree with the above that it isnt best practice

read on here there is often some disparity as to what is acceptable/correct/ or strictly by the book.


and thats another example of differing opinions
:smiley2:
 
  • Thread Starter Thread Starter
  • #8
all sorted...gona fit a pull cord isolater to rplace the switched one in the bathroom.......!!!!!!
and changed a fw of the new sockets that are damaged by plaster....lol
 

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