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Hello Guys. First I would like to say thank you for all the help I’m getting in this forum. My question is that I have a 60 amp sub panel with a number 6 wire, it is connected from the main panel on a 60 amp breaker. And going into subpanel feeding both legs a neutral and a ground. If I want to change it to a 100 amp can I still use the number 6 wite that is currently there?
 

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Very Stable Genius
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In some situations a reduced neutral is allowed. You may get the correct
answer here if you provide your location but more likely this type of
specific information would need to be supplied by your local inspector.
 

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I would use 1-1-1-3 Aluminum. It's a whole lot cheaper than copper and isn't too difficult to deal with.

Make sure not to bond the neutral and ground at the new sub panel. Throw that green screw straight in the trash, you'll never need it.
 
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