Trying to find some information on installing SER 3 cond. w/grd. in cable tray. As near as I can find out, it can be approved as long as the cable is listed and labeled TC and you don't stack them. If you install them in single layer and maintain spacing (1 cable diameter between them) the only derating applicable is ambient temperature adjustment. No spacing would cause a reduction to 95% of the ampacity on top of the temperature adjustment. Okay Cable Tray guru have your way with me [Linked Image]

George Little