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100 amp sub panel wire size

Asked Mar 5, 2007, 06:17 PM — 2 Answers
I now have the 100 amp breaker installed in my load panel. I will run wiring from the load panel to a 100 amp sub-panel in an unground 80 schedule PVC. I believe I need to use #2 wire for the the hots and the neutral. If this is correct, then what size ground do I use? Number 6? The sub- panel will be 50 feet from the main load panel.

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BWF's Avatar
BWF Posts: 6, Reputation: 1
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#2

Mar 5, 2007, 06:28 PM
Quote:
Originally Posted by cardomb
I now have the 100 amp breaker installed in my load panel. I will run wiring from the load panel to a 100 amp sub-panel in an unground 80 schedule PVC. I believe I need to use #2 wire for the the hots and the neutral. If this is correct, then what size ground do I use? Number 6? The sub- panel will be 50 feet from the main load panel.
A 100 main circuit breaker gets #4 wire (NEC), Codes are set by the AHJ authority having jurisdiction.
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tkrussell's Avatar
tkrussell Posts: 9,673, Reputation: 3698
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#3

Mar 6, 2007, 05:42 AM


Just to be clear, minimum size wire for a residential feeder is #4 Copper wire, or # 2 Aluminum wire, for hts and neutral.

The equipment ground can be #8 Copper or #6 Aluminum.

The distance is minimal, so voltage drop will not be an issue with either wire.
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