Adam,
Over time earth can be corrosive to metal, which is why good practice
here is to use PVC below grade and transition to EMT once the conduit is
exposed above grade. I suspect that concrete would have similar effects.
In New Mexico, state Code requires Schedule 80 if PVC is used above
grade, I suspect primarily because of the intensity of our
high-elevation sun, so by that logic you'd use a Sch. 80 90 sweep to
exit the slab, then transition.
Allan
*Allan Sindelar*
al...@sindelarsolar.com <mailto:al...@sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*
**
On 10/29/2016 6:50 PM, AE Solar wrote:
Wrenches,
I have a project where the DC run is going through the wall system of
the house, down through the slab, out the building underground and
into another building. My preference would be to run PVC in the slab
and then stub out of it with a metal 90.
I'm unclear if that is allowed. Is conduit in the slab considered to
be inside the house and therefore should be metal? Thanks for any
thoughts.
Adam
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