Wiring for welder

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  #1  
Old 10-03-06, 03:31 PM
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Wiring for welder

Hi all,

I have to choose conductors and circuit breaker for a welder. The cut sheet only says that it has a 300a output.

What does that mean in terms of how much current it will draw?

It is single phase 240v.

Please help if you can. Is there a calculation/table to determine the current draw from the current output?

Trip
 
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Old 10-03-06, 03:45 PM
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You are looking at the output, and it is possibly in Direct Current, so look on the unit somewhere there will be a tag with all the information you are looking for: Voltage, amperage, phase, etc.
With this information, you can determine the correct cable and breaker size.
 
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Old 10-03-06, 03:58 PM
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Oh yeah,

I suppose this would help: Model is MIL903126
 
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Old 10-03-06, 06:20 PM
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I assume this is a Miller machine?
I cannot find anything on the web with that p/n.

Look on the welder and find the rating plate. It should be there. I do not mean a label or name plate. I mean the small plate with all the technical info on it.

Find the "input" amps and voltage. The output amps is useless.
 
  #5  
Old 10-03-06, 11:49 PM
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If you have the Miller Shopmaster 300 AC/DC multi process power source, nice machine.

Here is a link to the Owner’s Manual.
http://www.millerwelds.com/om/o322a_mil.pdf

At 230 volts input, it draws 91 amps at the rated 300 amp output with a 50% duty cycle. The manual recommends a 110 amp max breaker with 6AWG CU conductors (input and EGC). Make sure you have the input voltage jumpers set properly.
 
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