[TCML] Wire Gauge
deano at deanostoybox.com
Fri May 30 16:33:33 MDT 2008
On Friday 30 May 2008 03:46:17 pm G Hunter wrote:
> For an outdoor 240vac/40A hookup, is 8AWG big enough, or should I go with
> 6AWG? The cable run will be roughly 100'.
Assuming copper conductor and THHN insulation the Ampacity would be OK, though
you would be near the limit for 2% voltage drop. If you can live with the
voltage drop at or near 2% (maybe closer to 2.5%) then 8AWG is OK. Keeping in
mind that the new code requires a full size ground for 6AWG and smaller, and
if you are going to pull a neutral, you are looking at 400' of wire. Though
6AWG would be better, with the price of copper now days, price may well be
the deciding factor.
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