Mike Lamb Posted July 12, 2017 Report Share Posted July 12, 2017 This panel is using a copper 1 AWG at a 200 amp main disconnect. The service entrance pipe is going to be too small for 3/0. This house does not need a 200 amp main. Will it be a problem to put 100 amp main into this 200 amp panel slot? Link to comment Share on other sites More sharing options...
Marc Posted July 12, 2017 Report Share Posted July 12, 2017 (edited) You'll need to ask your local (Challenger) electrical wholesaler if a 100 will fit in place of a 200 in that particular model of panel. I think there's a decent chance of finding a 175 or less that will work. 1/0 is ok on a 175 A service. I'd do a load analysis first to find out just how big a service you'll need. The NEC has instructions for doing that. That's more up a sparky's alley than an HI's though. Edited July 12, 2017 by Marc Link to comment Share on other sites More sharing options...
Mike Lamb Posted July 12, 2017 Author Report Share Posted July 12, 2017 Isn't 1/0 AWG different from 1 AWG? Link to comment Share on other sites More sharing options...
Marc Posted July 13, 2017 Report Share Posted July 13, 2017 Yes, 1/0 AWG is one size larger than 1 AWG. Dang, now I see my mistake. OK, a 150 A breaker or smaller will work once you confirm the actual load with a load analysis. Sorry. Link to comment Share on other sites More sharing options...
Mike Lamb Posted July 13, 2017 Author Report Share Posted July 13, 2017 Thanks. Link to comment Share on other sites More sharing options...
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