Wiring help - MTE 220 Dialog

[Andy4d]

Hi guys,
I bought a Migatronic MTE 220 Dialog a while back. It's wired for 3 phase and whilst I was trying to work out what size wire I needed to suit the current draw I had a look on Migatronic's website to see if I could find any info. The instruction manual on there says that it's a single phase machine and lists current ratings on a 1x400 volt mains (and lots of other voltages but all 1xXXX volts)? I'm confused, is this thing 3 phase or single phase? Any help would be much appreciated.

Thanks,
Andy

 

[piman]

Hello Andy,

it is a confusing description but many welders are 415 volt single phase using any two phases of a three phase supply. I've always called them single phase but many people describe them as three phase.
I don't know if there are any true three phase welding machines, I suppose there may be but I haven't come across one.

Alec

 

[Andy4d]

Thanks for that it makes more sense now - its single phase but 'joe public' tends to call it 3. Ta.

You say any two phases, does that mean any two live phases plus neutral (and earth?) or two phases including neutral (ie only one live).

That means I need a 35A fuse according to the info plate on the front of the machine, can anyone suggest what size cable I need for that over about a
30m distance (20m from supply to my workshop, then a flying lead in the workshop because the 3 phase will power my milling machine too).

Thanks.

 

[piman]

Hello Andy,

no, forget the neutral, any just two phases and certainly the earth is essential.

I can't give you a cable size off the top of my head but I'm sure someone who does installation work will be able to help or else revert to Google?

Alec

 

[Andy4d]

Alec,
Thanks very much for the help, and you're spot on right - I rang migatronic's customer service this afternoon and they describe it as you say. So really it's 2 phase, no wonder I was confused.

The upshot of this is I might have it wired in by the weekend

Thanks again.

 

[Robotstar5]

A handy cable calculator.