18-27-347.2. Uses Permitted. The use of listed rigid nonmetallic conduit and fittings shall be permitted under the following conditions: FPN: Extreme cold may cause some nonmetallic conduits to become brittle and therefore more susceptible to damage from physical contact. (a) Corrosive Influences. In locations subject to severe corrosive influences as covered in Section 18-27-300.6 and where subject to chemicals for which the materials are specifically approved. (b) Cinders. In cinder fill. (c) Below a Slab on Grade. Rigid nonmetallic conduit shall be permitted when buried at least 24 in. (609 mm) below the floor slab. All stub ups shall be galvanized rigid steel conduit or intermediate metal conduit. (d) Underground Installations. For underground installations, see Sections 18-27-300.5 and 300.50. 18-27-347.3. Uses Not Permitted. Rigid nonmetallic conduit shall not be used in the following locations: (1) In any installation not permitted in Section 18-27-347.2; (2) In hazardous (classified) locations, except as covered in Sections 18-27-514.8 Exception No.2 and 18-27-515.5 Exception; (3) In Class I, Division 2 locations, except as permitted in Section 18-27-501.4(a), Exception; (4) For the support of fixtures or other equipment; (5) Where subject to physical damage unless identified for such use; (6) Where subject to ambient temperatures in excess of 50oC (122oF) unless listed otherwise; (7) For conductors whose insulation temperature limitations would exceed those for which the conduit is listed; (8) In theaters and similar locations, or any other Place of Assembly. 18-27-347.4. Other Articles. Installation of rigid nonmetallic conduit shall comply with the applicable provisions of Article 300. A separate equipment grounding conductor shall be installed in the conduit, and shall comply with Article 250. PART A. INSTALLATION
#51341 - 04/28/0509:28 PMRe: EMT permitted outside in Chicago
Yes, PVC can be problematic in Chicago. I suppose, if the conduit were outdoors, under a wood, raised deck (as for an above-ground pool), and had lots of air circulation. the inspector might object. On the other hand, if this were an indoor pool, where even the stainless hardware "rusts" to the aluminum diving board....or down in the "steel making" neighborhoods, where the paint flakes off new cars in two years....even a Chicago inspector would see the wisdom. Corrosion, I suppose, is the key issue. Maybe run EMT- and a ground wire just in case?