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The problem is, this might actually be a 120V feed with the single hot wire split to both main lug inputs. We don't know it's not.

40 amps = 8 ga wire. Careful with the advice.
Normally you'd be right. But welders are weird.... and #10 is actually good for 35 or even 40A in certain conditions but for NEC 240.4 which clamps #10 to 30A always.

Also, at #10 or larger it's time to at least be aware that aluminum is an option. 10/3 is about the same price as 2-2-2-4 (90A). A lot of people would liked to have known that lol...
 

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Naildriver
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Take one screw out of the bottom of the plate, open it up and post a picture of the inside of the box. Gee, with all the speculation, I would have figured someone would have asked for one by now.
 

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Take one screw out of the bottom of the plate, open it up and post a picture of the inside of the box. Gee, with all the speculation, I would have figured someone would have asked for one by now.
Actually the OP has confessed his lack of electrical knowledge, so he shouldn't be opening any boxes. If he can't determine what is feeding this panel by looking for a sub-panel breakers, he needs a on sight electrician. There is so many questions about voltage, amperage, wire size, neutral, ground and outlet configuration, he needs a electrician.
 

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He said his garage is one of three, which probably means that is a House Panel. Common area lights and possibly common garage power (interior) or irrigation controller. He's probably not authorized to use it anyway.
 
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