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Is there an Electrician in the house?


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Old 05-18-2014, 08:45 PM   #1
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Default 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?
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Old 05-18-2014, 09:30 PM   #2
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Most times , more is better . 8 gauge cable is fine and I would go with 50A for potential spikes in amperage draw . OMHO .....
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Old 05-18-2014, 09:35 PM   #3
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Default 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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Old 05-18-2014, 09:43 PM   #4
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Just make sure whatever wire you run, you check the ampacity of the insulation.


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Old 05-18-2014, 09:46 PM   #5
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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.
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Old 05-18-2014, 09:50 PM   #6
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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.

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

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Old 05-18-2014, 09:51 PM   #7
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Quote:
Originally Posted by readytogo View Post
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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Old 05-18-2014, 09:52 PM   #8
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Stick with copper.


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Old 05-18-2014, 10:20 PM   #9
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Quote:
Originally Posted by kytowboater View Post
Stick with copper.


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

This. Copper is stronger, dissipates heat better,
and is less prone to brittleness and carbon
scoring.
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Old 05-18-2014, 10:36 PM   #10
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Just to be clear does it require a 50A circuit or is the F.L.A. (full load amperage) 50?
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