Are you allowed to wire more than one circuit into a fuseway or mcb. I
want to add a one light and switch and add a circuit feeding two
double sockets.the consumer unit does not have any spare slots. The
wiring is for a garage conversion, the consumer unit is sited in the
the garage adding the circuits this way makes it a nice easy job.
The building inspector wants to see a certificate when the work is
complete, I do not want to do the job and then find I cannot get a
Any guidance and advice appreciated.
Yes if you use common sence. Muliple feeds at lighting MCBs are common eg.
you use two runs from one MCB for the downstairs lights as the CU is in the
middle of the house and it is easier to wire that way. You cannot add
another circuit if the existing circuit is fully loaded (ie 1.3kw or already
has 13 lights on it for a 6A MCB
As to the sockets, is it a radial or a ring?
Who is supplying the inspector with the certificate? What certificate does
Let me know
The downstairs lighting circuit feeds 10 lights, the sockets will be
ring. I think I can cut into the existing downstairs ring circuit to
add the two sockets. ( Have a double socket already in the garage )
All the downstairs circuit is RCD protected.
Not sure exactly what certificate is required, I was going to put in
the circuits and then get a electrician to test them. I will ring the
inspector and find out.
It's presumably for Part P Building Regulations.
You can't "put in the circuits and then get a electrician to test
them", the alternatives for getting through Building Regulations
Do it yourself and have it inspected by the Council Building
Regulations people who will then sign it off. It's up to them (by
arrangement with you) when and what inspections they do. They are
not allowed to charge you any extra for this, it must be included
in the standard Building regulations charges. They then give you
the paperwork as part of the overall Building Regulations
Get an electrician who can 'self certify' to do the work and then
the certificate he gives you can be passed on to Building Regs. to
show that the work is up to standard.
In the 'do it yourself' case if you can convince the Building Regs
people that you are competant and have the right test equipment then
they may be happy to certify/accept it on this basis.
What *isn't* possible is to get a third party who hasn't done the work
to provide a certificate, the only people who can do that are the
Building regs people.
That doesn't make much sense as a fuseway effectively defines a circuit.
You can have spurs feeding a single or double socket taken from
the ring circuit fuse. Each will need a separate cable back to
the fuseway, so if there's more than one, it will probably be easier
to modify the ring to include them in it, rather than as spurs.
The lighting circuit is no problem to take another cable directly
from the fuseway as it's a radial.
If you are doing the work, then building control are required to
provide the certificate at their expense -- that what you paid
them for. They are not permitted to ask you to get it inspected,
although there have been stories of a number trying this on.
This is explained very clearly in the Part P document.
If you are employing a Part P electrician, then he will provide
the certificate, but the job no longer requires any building
If you connect up the lights and sockets to the existing circuits
without going into the CU, then it's minor works and again no
certificate or building control involvement is required.
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