Posted 7/10/2009 11:38 (#771335 - in reply to #771301) Subject: RE: Talked to a Union plumber about just that
I think that is due to fire code, not electrical.
Romex is allowed in temporary installation, but permanent must be in conduit. I'll bet it has to do something with not having rodent damage in conduit, and homeowners can't drive a nail or drill into it as easily as romex.