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string1946 05-18-2014 07:45 PM

Is there an Electrician in the house?
 
I worked for the power company for a long time but I was an operator in a power plant and not an electrician. I'm going to run a circuit for a Lincoln AC 225 welder in my garage that will be about a 20' run. The welder says it needs a 220V 50A input. I doubt it will ever pull that much current and if it did it would only be for short periods. I'm leaning toward a 50 amp breaker and #8 wire. What do you think?

dango 05-18-2014 08:30 PM

Most times , more is better . 8 gauge cable is fine and I would go with 50A for potential spikes in amperage draw . OMHO .....:)

kytowboater 05-18-2014 08:35 PM

Is there an Electrician in the house?
 
Depends on the wire ran. THHN insulation (thinks it's the most common, think romex) #8 is good to 50 amps. I would run #6. Rated to 65 amps even in a continual draw. Plus it's less resistance keeping wire cooler and your energy costs down a little.

Stick with the 50a beaker though.


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kytowboater 05-18-2014 08:43 PM

Just make sure whatever wire you run, you check the ampacity of the insulation.


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readytogo 05-18-2014 08:46 PM

A 50 amp circuit requires a #6 gauge wire if copper and #4 gauge wire is aluminum is used.
Voltage drop: 0.79
Voltage drop percentage: 0.36%
Voltage at the end: 219.21volts,nohing to worry about.

SSGN_Doc 05-18-2014 08:50 PM

All I know about electricity is that it involves magic smoke. Every time I let the magic smoke out of the system, stuff stops working.:D

Sounds like others are better equipped to give you the answers you need.

kytowboater 05-18-2014 08:51 PM

Quote:

Originally Posted by readytogo (Post 1577754)
A 50 amp circuit requires a #6 gauge wire if copper and #4 gauge wire is aluminum is used.

Voltage drop: 0.79

Voltage drop percentage: 0.36%

Voltage at the end: 219.21volts,nohing to worry about.


Can't be anymore clear than this.


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kytowboater 05-18-2014 08:52 PM

Stick with copper.


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therewolf 05-18-2014 09:20 PM

Quote:

Originally Posted by kytowboater (Post 1577760)
Stick with copper.


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^^^^^^^^^^^^^^^^^^^^^^

This. Copper is stronger, dissipates heat better,
and is less prone to brittleness and carbon
scoring.

25-5 05-18-2014 09:36 PM

Just to be clear does it require a 50A circuit or is the F.L.A. (full load amperage) 50?


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