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Old 04-08-2010, 03:18 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.

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Last edited by shortsell; 04-08-2010 at 10:30 AM.
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Old 04-08-2010, 06:18 AM   #2
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Sub panel help


First step is to get a permit. Requirements may vary a little but your Safety and Liability are on the line.
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Old 04-08-2010, 08:52 AM   #3
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Sub panel help


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.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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