Wire size


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Old 05-26-20, 03:51 AM
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Wire size

Going to run electric from my house to my garage, what size wire would i need for a 125amp panel? It's about 100ft from house to garage?
 
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Old 05-26-20, 04:19 AM
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12 gauge with a 20 amp breaker. That will handle most power tools. The 100 feet is not so much. Think about the length of wire going throughout the house. 100 feet is not excessive.
 
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Old 05-26-20, 04:38 AM
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I'm not an electrician but I would use 2 ga wire as a minimum. Are you sure you need such a large panel in the garage?
 
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Old 05-26-20, 06:24 AM
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For 125A #2/0 aluminum will do nicely. One of the best options is 2/0-2/0-2/0-1 MHF. MHF is direct bury but would be best in conduit all the way panel to panel. It does have to be in conduit where above ground including inside. If you don't want direct bury cable use XHHW-2 AL wires in the same sizes.
 
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Old 05-26-20, 08:15 AM
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what size wire would i need for a 125amp panel?
That would depend on how many amps you will be feeding the panel with. Just because the panel is rated for 125 maximum amps doesn't mean you have to feed it with 125 amps. What will you be using the electric in the garage for? For most people 60 amps would be more than adequate. It hasn't been so many years ago that there were still plenty of older homes that only had 60 amps for the entire house.
 
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Old 05-26-20, 12:17 PM
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Casualjoe makes a very good point. If you decide you do want a 125A feed to the garage make sure your main house panel can take a 125A breaker, some panels you may find are limited to 100A breakers for branch circuits. Another popular feeder is 2-2-2-4 MHF which is good for up to 90A but is commonly fed from a 60A breaker because the 60A breaker is usually a lot cheaper than the 90A breaker. You can always up the breaker size to 90A if more power is needed later. Some inspectors will allow a 100A breaker on the #2 Al, but as a sub feeder technically only a 90A max breaker is allowed by the NEC.
 
 

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