[RE-wrenches] Conduit in a slab

[AE Solar]

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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