I think NEC article 230.6 might answer your question? I copied it part of it below if that helps...
Later, Travis Jordan 230.6 Conductors Considered Outside the Building. Conductors shall be considered outside of a building or other structure under any of the following conditions: (1) Where installed under not less than 50 mm (2 in.) of concrete beneath a building or other structure (2) Where installed within a building or other structure in a raceway that is encased in concrete or brick not less than 50 mm (2 in.) thick -- *Travis Jordan* tra...@jordansolar.net *877-215-8431, Ext. 104* *Cell: 406-274-1230* *Jordan Solar* *jordansolar.net* <http://www.jordansolar.net/> [image: Jordan Solar Logo] <http://www.jordansolar.net/> Solar PV Installer # 031409-69 <http://www.nabcep.org/> MT EL License # ELE-EJ-LIC-9886 WA EL License# TRAVIJE901PK ID EL Masters # 010810
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