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Old 02-28-2011, 06:54 PM  
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Default Feed to Separate Building

I'm sure this can't be right, but I've discovered that the feed to my detached garage comes from a 220v 50amp breaker in the main panel in the house. The current is carried by a 10-3 NM cable across the 33 feet to the garage and terminates at an old fuse box in the garage. This box contains 3 of those tubular black fuses and the entire garage is fed directly from this box.

Am I off the mark or is the 10-3 wiring woefully inadequate to carry anything near 50 amps? In other words, wouldn't the wiring fail before the breaker would ever trip? I haven't had any problems of any kind to date, but I'd like to avoid them in the future as well. I'm thinking that an upgrade of feed wiring, a breaker box install, and some garage interior re-wiring is in order.

Any thoughts appreciated!

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Old 02-28-2011, 07:14 PM  
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30 amp breakers tied together would be the most you would want, the fuses in the garage should be 15 amp. or less, I think.

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Old 03-01-2011, 05:44 AM  
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Originally Posted by nealtw View Post
..., the fuses in the garage should be 15 amp. or less, I think.
What do you base this on?
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Old 03-01-2011, 07:01 PM  
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Yes, 10 AWG is incorrect wire size for a 50-amp breaker. Either increase the wire size or decrease the breaker size.
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