Re: wire guage vs. amperage

Posted by NC Wayne on September 05, 2005 at 20:33:31 from (64.12.117.7):

In Reply to: wire guage vs. amperage posted by mark h on September 05, 2005 at 19:50:53:

Hey Mark, pick you up a copy of the Pocket Refference by Thomas J Glover. I've got the Third edition from 2003 so I'd assume any printed since then will have the same info plus some. It seems to get thicker with each printing. You should be able to get one online from Mcmaster Carr, Grainger, etc. It's a really usefull refference for other things also so it's a good investment. It has a section devoted to automotive wire sizes and the allowable amperages-vs- lengths of a run. I can tell you it has nothing to do with the NEC guidelines. For instance with 14ga you can go up to 10' and still carry 36 amps with a max length of 15'at 24 amps with the NEC the max on any 14 ga circuit is 15--- here 20ga is good for 105 amps at 1'and 10amps at 10'. At the larger end of the chart 10 ga will do 913 amps at 1' and 91 at 10' with a max of 46 amps at 20'. Basically except for the charging system you could just about wire the whole thing except for the charging system with 14, 16, and 18 ga. If you'll look at the way most of them are done from the factory the majority of the wiring is 16ga or smaller. Hope this helps and good luck with the wiring project.

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