Re: Rewire Entire House
I don't know what you're smoking, but it's certainly not #12 or #14 wires unless you're trying to run 30A loads on them.
Originally Posted by MtMan54
Wires don't consume electricity; they transmit it. A larger wire isn't going to be any more energy efficient than a wire that is properly sized for the load. The size of the wire isn't going to change your electric bill any more than reducing the number of outlets installed in your home.
What a larger wire will be is more expensive and harder to work with. For fixed lighting circuits, you can use #14 wires and limit the load to about 12A (even though the circuit is rated for 15A, the NEC requires a continuous load not exceed 80% of the circuit rating). Except for kitchens & bathrooms, receptacle circuits may be wired with #14 (on a 15A breaker) though #12 (with a 20A breaker) is a good idea.
Having light fixtures on separate circuits from receptacle outlets is a very, very good idea. That way, when a breaker trips, you'll still be able to have light in the room whether from the fixture or a portable lamp.
There is no point in running oversized wire unless the circuit is an excessively long run (~100 feet; there are voltage drop calculations you can do but that's beyond the scope of this discussion). You're not allowed install 15A or 20A receptacles on a 30A circuit anyway.
Last edited by Fencepost; 04-09-2014 at 02:56 PM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.