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Old 04-08-2010, 02:18 AM   #1
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Sub panel help

Installing a 200amp all in one box outside , not much will be on this one, just a few circuits - 30 ft away I need a 125 amp sub panel 22 breakers 15 & 20 amp & 6 240v lines that are ALU old gray type wire & will have 30,40,amp breakers. Will power a 2 ton & a 3 ton air unit.
What wire size should I run 1/0 or #2 wire to the sub ??
2 hot -1 neutral, & what size for the ground ?
please explain about keeping the neutrals and ground buss separated, only in the sub panel?
Permits are in hand.

Thanks for the knowledge.

Last edited by shortsell; 04-08-2010 at 09:30 AM.
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Old 04-08-2010, 05:18 AM   #2
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First step is to get a permit. Requirements may vary a little but your Safety and Liability are on the line.
& Stay Safe
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Old 04-08-2010, 07:52 AM   #3
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Have you done a load calculation to see what size feeder you need to the subpanel? The 125 amps is just the max that can feed that panel.

Also refer to this sticky post.
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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