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In my house can I upgrade a 30 amp breaker to a 40 amp breaker in my main breaker panel, if I ran the right gauge wire (8-gauge I think )? I have a 100 amp panel...

Don't have any any slots available in the panel but I have a 240v 30amp not doing anything. That I can use in the basement if were able to upgrade to a 240v 40amp breaker and just run new wire in the basement
 

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As long as you run the correct gauge wire, you can upgrade the breaker.

Also, make sure that the breaker is the correct one for your panel. There should be a sticker on your panel that lists the type of breakers you can use. Or just copy the brand of breakers in use currently in your breaker.

Fourteen-Gauge is good for 15 amp, Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps.

If you are out of slots in your panel, consider putting in a sub-panel to free up some spaces. You can move some of the breakers from the main panel to the sub-panel. Or the sub-panel can allow you to run new circuits.

If you need to add additional circuits, check to see if you can use tandem breakers in your panel. (2 breakers in one slot)
 
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