On Tue, 12 Aug 2003 07:37:58 +0100, Peter Hemmings
I've always done it with the earth wires from the cable into the
socket and then one from there to the box. I don't believe that I've
seen anything in the Wiring Regulations or even various guides on it.
My thought would be that if you wire to the box and then to the
socket, that if the wire from box to socket broke, that there is no
earth at the socket. The other way round and two wires have to break
to lose it completely.
I don't think that it's absolutely necessary to wire the washing
machine separately, although as you are doing, it is useful to have
the kitchen ring wired separately to the rest of the house. If you
think that you might be likely to run a washing machine, a tumble
dryer, a dishwasher and a kettle at the same time, I suppose you could
run to the limit of a ring circuit, but diversity generally indicates
that you are unlikely to run into trouble.
It is useful, perhaps, to run the freezer from a separate radial
circuit with the breaker on the non RCD side of the consumer unit.
This avoids the issue of an RCD trip compromising the freezer.
It is probably a good idea to have the main kitchen circuit on the RCD
protected side for a couple of reasons. a) It's an environment where
water is being sloshed around and sockets may be close to sinks. b)
depending on the house, you may be plugging in portable appliances
that you use outside.
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It also makes more sense from the ease of doing it point of view
doesn't it as it will be easier to move the socket away from the box
if all the wires from the cable go to the socket. The separate earth
wire from the socket to the box is quite flexible and can be quite
Is it actually required by the wiring regulations to have this wire or
is the connection provided by the screws satisfactory? I seem to
remember a discussion hereabouts saying the screws are OK as long as
at least one of the lugs on the box is a fixed one (i.e. it's part of
the metal of the box, not a sliding one).
Wire to the socket and then take a lead to the box. If the socket has two
earth terminals, wire one ring earth to one and one ring earth to the other.
Wire the box and any spur earths to either terminal at random.
It is called a radial circuit. The freezer and fridge should be wired to a
separate way in the consumer unit. This circuit should NOT be RCD protected,
except in a TT system where they should only go through a 100mA Type S time
delay RCD. The purpose of this is purely to ensure your freezer stays on
when a fault occurs elsewhere on the circuit or in the house.
You should have a separate kitchen ring main which is RCD protected. The
washing machine can fit on this. If the heating element of the machine blows
the RCD, then the element should be replaced, as the insulation is shot.
Putting such a machine on a non-RCD circuit is a dangerous bodge. Elements
are cheap and easy to replace.
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