In article , Tim.. the.farm.no
@spam.btinternet.com scribeth thus

wrote in message
...
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....


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
operation.

Tim..


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
the mains.

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
fashion!...
--
Tony Sayer