I have a 6.5kw 220v single phase generator that I want to wire up to
supply backup supply to a couple of offices in my house. The mains
supply in the house is three phase 220v...
Is there a way to wire this up? Something like an isolator/generator
switch on one of the phases (as long as the offices are on the same
phase)? I don't want to go to the additional expense of purchasing a 3
phase generator or a single to three phase converter but would like
backup power into the office circuits. I'm not too concerned about
have the entire house on the generator but do need the offices....
On Mon, 21 Jan 2008 23:27:11 -0800 (PST) someone who may be
firstname.lastname@example.org wrote this:-
I doubt it, especially in the UK. If you are not in the UK perhaps
you could say where this house is.
There are ways. However, the confused nature of your description
implies to me that you don't have the necessary knowledge of
electrical systems to do this safely. There are a number of things
which might trap the unwary, for example earthing arrangements.
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
Something like this
connected to one of the phases then to a new consumer unit, supplying power
to both offices would work.
This would then allow you to power everything on this new consumer unit from
the generator in a power cut.
Note that you will need to pay careful attention to the earthing
arrangement here. If you normally have an earth connection provided by
your electricity supplier (i.e. TN-S or TN-C-S), then you will not be
able to rely on this when using the generator. This can make switching
more complex since you may require alternative circuit protection
Firstly you must have a TT system or at least have it converted to a TT
system in order for the protection systems (RCD s etc) to function properly.
Sencondly, depending on how your house / office is distrubuted from the
mains 3 phase, it may not be as easy "as that" to supply just the offce from
a 1ph generator, inwhich case you will HAVE to have a 3ph machine.
Thirdly, nearly all domestic (i.e under about 15kva 3000rpm) generators are
wired with either a single or more likely dual stator (230v or 115v x2) and
are unable to be re configured for 3ph output.
Have a spark come out and examine your existing layout and circuit
distrubution and advise you from there. Whichever, it will not be a cheap
You could run a lead from it to some sockets and simply plug what you
need to supply of them?. Where they would normally need plugging into
Otherwise its a changeover switch. A MUST NOT be able to feed the output
of the genny back into the mains., Hence these units are break before
make changeover but that may well need doing in a rather serious
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