Millermatic 210 wiring

[mike96]

I am wiring a MM210 230V machine in my buddies garage. I got #10 wire with a 40 amp breaker and the machine is only supposed to draw 27 amps (ithink)
will this work?

[Sandy]

I am wiring a MM210 230V machine in my buddies garage. I got #10 wire with a 40 amp breaker and the machine is only supposed to draw 27 amps (ithink)
will this work?

Keep it short and dedicated to the welder. Best way to do that is use the reccommended 6-50R at a single loacation and label it "welder" in the box. Stay with a 30 amp breaker if ya want. It'll only want 27 amps at absolute max output which will rarely happen.

[mike96]

ya but do you know for sure it only draws 27 at max? cause it wasnt specific when it said that.

[Sandy]

ya but do you know for sure it only draws 27 at max? cause it wasnt specific when it said that.

Of course it's your welder and your book so you need to verify what it says, but these guys are pretty good at covering their butts on issues like this so if they say 27 amps it means 27 amps as hard as you could possibly push it. They've made allowances.

The machine itself has it's own internal over current device as well as thermal cut-off. There isn't much sense in exceeding the over current device that is in (on the back) of the machine by a bunch unless you feel like exercising that breaker instead of the panel mounted one. If, by some odd chance, you were able to get more than 30 amps out of the unit itself the built in trip device is going to operate and cut the machine off.

You could put in a larger panel mounted breaker if you'd like but there seems to be some magical price jump at 30 amps and you are setting up the scenario to plug in and RUN a higher amperage device on the 10awg that is feeding that plug without doing the necessary homework to verify that it will be okay.

Your call. :)

[mike96]

cool, thanks

[got aluminum]

#10 wire in THHN is only rated for 30 amps by code. Do not put a 40 amp breaker on the #10. If the name plate of your machine says 27 amps use the 30 amp breaker and the #10. If you go with a bigger breaker up size your wire.