Need opinions here: We are having a new Fire Alarm installed in one of our buildings. Some of the new Fire Alarm EMT is installed above the bar joists, tight to the roof deck. We're on 2008. I've been thru 760 several times and can find no ref to 300.4. Therefore I need opinions: Based on this section 760.3 Other Articles. Circuits and equipment shall comply with 760.3(A) through (G). Only those sections of Article 300 referenced in this article shall apply to fire alarm systems. Does this section apply? (E) Cables and Raceways Installed Under Roof Decking. A cable- or raceway-type wiring method, installed in exposed or concealed locations under metal-corrugated sheet roof decking, shall be installed and supported so the nearest outside surface of the cable or raceway is not less than 38 mm (11⁄2 in.) from the nearest surface of the roof decking.
From 2011 NEC 300.4 (E) Cables, Raceways, or Boxes Installed in or Under Roof Decking. A cable, raceway, or box, installed in exposed or concealed locations under metal-corrugated sheet roof decking, shall be installed and supported so there is not less than 38 mm (11⁄2 in.) measured from the lowest surface of the roof decking to the top of the cable, raceway, or box. A cable, raceway, or box shall not be installed in concealed locations in metal-corrugated, sheet decking– type roof. Informational Note: Roof decking material is often repaired or replaced after the initial raceway or cabling and roofing installation and may be penetrated by the screws or other mechanical devices designed to provide “hold down” strength of the waterproof membrane or roof insulating material. Exception: Rigid metal conduit and intermediate metal conduit shall not be required to comply with 300.4(E).