NEC Art. 350 & 351 allows these wiring methods to be unsupported in lengths up to 3 feet at terminals where flexibility is required (such as at motors). Article 300-22(b) permits these wiring methods in lengths up to 4 feet to connect "physically adjustable equipment and devices in ducts and plenums". Does the location specific 300-22 (such as a fan motor in an air handler's casing) supercede the general requirements of 350/351 and allow UNSUPPORTED 4 foot lengths in this application?
