Re: UK mains supply question



Marky wrote:

"Alan Holmes" <alan.holmes@xxxxxxxxxx> wrote in message news:agCpf.39898$7p5.1916@xxxxxxxxxxxxxxxxxxxxxxx


"Chris" <chris@xxxxxxxxxxxxxx> wrote in message news:121wgkrvqlycn.6jc0kd4lkvxq$.dlg@xxxxxxxxxxxxx


I have bought a TIG welder that will run off UK 240 volt single phase 50
hertz AC supply, but on full power can draw up to 50 amps. I want to wire
this off the house incoming mains distribution board, to a spur in my
worksshop, about 30 feet away. The mains supply from the road is on a 100
amp fuse to the meter.


But are you sure you would ever want to use it at full power?

Alan



Oh, and 50 amps is rather a lot, are you sure it pulls 50amps or is it rated at max 50amps ?




50 A is not a lot for a large TIG welder. These also have an ATROCIOUS power
factor, so they generally have a huge phase angle correction capacitor bank in them. My
Lincoln Square-Wave TIG 300 (at the upper end of the size range) supposedly
draws 67 A of leading current when idling, due to the huge phase correction
bank. The power factor gets better in the middle of the range. I have it on a 70 A
breaker right now, that is the smallest one that holds on.

If that 100 Amp supply is for your entire house, as well as the shop, you are getting
close to the limit, I'd think. You might have a problem with tripping the main
service entry breaker if too much gear is running in the house when you use the
welder. If you can arrange that all the major appliances are kept off when you use
the welder, you can probably get away with it. I have a 200 A 240 V single-phase
service at my house.

Jon

.

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