IAW 2008 NEC, 400.8(6) ( uses not permitted ) SO cord is not permitted in raceways except as otherwise permitted. The SO in question is a feeder to 150HP air compressor, from a disconnect 50 feet away. Because the cord is subject to damage 4" GRC was ordered as a raceway. SO cord was used because the installation is not permanent, or sometime in the future it may be moved. Can anyone quote a NEC passage to permit this install? I can't find one, thanks in advance... Oh please ignore the fact that once the SO is in the GRC you will need bigfoot to pull it out through the 3-90's used.....