Power Input

[Gebada22]

I have a new Lincoln MP210 and I am trying to understand the input needs. I have attached the applicable pages from the Lincoln manual.



I would appreciates your help. When I look at the input it appears that the max is 27A at 230 with 25% duty cycle and 21.5A 120 with 40% duty cycle. The shop at a 200 amp service but everything is marked on the panel as 110/220. The plug I was planning on using is a 220 plug with two 20A breakers that are connected. It shows that the breaker should be 40A based on the manual. I suspect that two 20A are not the same and that I would need to use two 40A breakers? The also suggests 12 gauge wire, but if I go to 40A isn't that a little light?

I appreciate your help. Greg

 

[PILOON]

It looks to me that there is a miss print there, 20 amps is good on #12 wire (code) and ok for both legs on the 220 but for sure not 40.
My guess is the printer or whoever proof read figured 2 x 20=40 and erroneously corrected what was not an error.

 

[PILOON]

It looks to me that there is a miss print there, 20 amps is good on #12 wire (code) and ok for both legs on the 220 but for sure not 40.
My guess is the printer or whoever proof read figured 2 x 20=40 and erroneously corrected what was not an error.

Probably was printed in China and proof read there as well.

 

[Mark @ Everlast]

No, at least according to the NEC, the gauge of the wire is de- rated according to the duty cycle of the welder at the maximum amp draw, rated, not inrush. The breaker is sized according to the inrush. Sec. 630 I believe.

 

[ThomasH]

I have a new Lincoln MP210 and I am trying to understand the input needs. I have attached the applicable pages from the Lincoln manual. <snip>

The plug I was planning on using is a 220 plug with two 20A breakers that are connected. It shows that the breaker should be 40A based on the manual. I suspect that two 20A are not the same and that I would need to use two 40A breakers? The also suggests 12 gauge wire, but if I go to 40A isn't that a little light?

I appreciate your help. Greg

The NEC allows derated cable in shorter runs for things like a welder, which don't draw a consistently higher current (unlike a heater or stove). With that said, you might need to plug something else in the outlet which might be more consistent in it's current draw. Also, you will hit the limits of the welder a tad sooner if the voltage drops across a smaller wire (maybe 5% or so, it's not a lot).

For the stated reasons, I would spend the small amount more to get heavier cable, such as #10 for a short run, or #8 for up to 100 feet. Then it is not a concern if you need to plug in a compressor or some other motorized equipment that needs 220 at 20+ amps.

 

[Steave]

According to the specs of a MP 210 welder you will be safe and trouble free if you follow what the page above states. #12 wire, 40amp 2pole breaker, unless as stated above a long distance from the panel 100' +. You will have to install the receptacle that matches your 220V plug from the welder.

Any other equipment you may want to use in the same receptacle and if it pulls more than 20 amps the plug from that equipment won't fit into that receptacle anyway, unless it has been altered. This line is a dedicated line for the welder and should only be uses as a welder receptacle. I sure do envy you having the MP210 I've been looking at them and the comparable Miller. I don't TIG much but would like to learn.