So having looked up the onsite and the main 7671 books I cant find an answer!!
scenario
main house 2 consumer units 1 normal 10 way and an economy 7 cu separate.
then a 2nd CU supplied from 1st in an extension and a 3rd supplied from 2nd in a shed
the 2nd one is the one in question!
the 2nd is a 10 way split load board served from a 63A type 2 MCB on the 1st CU. they are 7 metres apart and the cable is 10mm T&E under floors in wall etc all loose cable no insulation.
the load on the 2nd CU is
a smoke alarm circuit with 4 smoke alarms and 1 heat
a outdoor power circuit 4mm radial supplying a double outside box and a shed (3rd consumer unit in shed) with 20A MCB to double socket(2.5T&E) and 6A MCB to a light (1.5T&E)
An electric boiler 6KW max (running underfloor wet heating)
2 Radial Socket circuits 32A MCB's 4.00 T&E cable 2 metres max
1 radial circuit 6A MCB for heating controller/pump 1.5 T&E cable 1.5 metres max
1 radial circuit 6A MCB for single impeller pump (hot water boost as combitank installed in house (no pressure) 2.5 T&E cable 3 metres max
2 lighting circuits 6A MCB's 1.5 T&E cable 4 metres max 2 down lighters on each
What is wrong with the current install (if anything) and how would you improve it? customer needs to sort it as holding up sale of house because 2 electricians have said its wrong but not why!
total load I would say is 7.5 - 8Kw on maximum demand.
edited: as MCB is 63A not 50 as I first posted.
scenario
main house 2 consumer units 1 normal 10 way and an economy 7 cu separate.
then a 2nd CU supplied from 1st in an extension and a 3rd supplied from 2nd in a shed
the 2nd one is the one in question!
the 2nd is a 10 way split load board served from a 63A type 2 MCB on the 1st CU. they are 7 metres apart and the cable is 10mm T&E under floors in wall etc all loose cable no insulation.
the load on the 2nd CU is
a smoke alarm circuit with 4 smoke alarms and 1 heat
a outdoor power circuit 4mm radial supplying a double outside box and a shed (3rd consumer unit in shed) with 20A MCB to double socket(2.5T&E) and 6A MCB to a light (1.5T&E)
An electric boiler 6KW max (running underfloor wet heating)
2 Radial Socket circuits 32A MCB's 4.00 T&E cable 2 metres max
1 radial circuit 6A MCB for heating controller/pump 1.5 T&E cable 1.5 metres max
1 radial circuit 6A MCB for single impeller pump (hot water boost as combitank installed in house (no pressure) 2.5 T&E cable 3 metres max
2 lighting circuits 6A MCB's 1.5 T&E cable 4 metres max 2 down lighters on each
What is wrong with the current install (if anything) and how would you improve it? customer needs to sort it as holding up sale of house because 2 electricians have said its wrong but not why!
total load I would say is 7.5 - 8Kw on maximum demand.
edited: as MCB is 63A not 50 as I first posted.