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Old 05-10-2008, 10:02 PM   #1
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Newbie here 100 amp subpanel

Hi great forum,
I have been surfing all the 100 amp subpanel threads. I'm very confused... I have a 200 amp service (GE main panel) and I installed a 100 amp 2 pole breaker in the main panel then ran jacketed AL 2-2-2-4 SER (per some chart in home depot) along my unfinished basement ceiling 87 feet away to a seimens 100amp (main breaker) sub panel in my attached garage. Now what I would like to use this panel for (2) 220 Welders,Miller thunder stick 225 and millermatic 200 mig (50 amp breaker for both I will only use 1 at a time) I will install 1 220 outlet and will use a flexable 25 ft 8/3 welding extension cord and 220 air compresor (40 amp breaker). Here is where I'm confused... I'm reading that AL 2-2-2-4 is only 90 amps @ 75 degrees. I was told because I didn't have it in conduit it would be 100 amps. I'm freak for doing jobs right the first time and over kill is my friend!! I just don't want to start welding and "pop" a breaker. Will it be possible to run the air compressor while welding? I may also add some bench top outlets for hand power tools. Someone put my mind at ease.... Any info would be great.


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Old 05-10-2008, 10:12 PM   #2
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310.16 is the table you should have used to size your wire, and #2 AL. is only good for 90 amps, but I dont know the actual load of your equipment to know if thats a problem or not.


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Old 05-10-2008, 11:32 PM   #3
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Chris is right. Breaker popping may or may not be an issue.

If you're a newbie, and if you want to, post a picture of the wiring inside your subpanel and we can make sure you did it all safely as well.
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