Best Answer: the rate of diffusion is directly proportional to the concentration gradient. The greater the difference in concentration between two areas, the greater the rate of diffusion.
EPC-40: Electrical Plastic Conduit : Designed for normal duty application. EPC-80: Electrical Plastic Conduit : Designed for heavy duty application.
Total weight of conduit including wires enclosed may be a factor in the requirements for conduit support. PVC electrical conduit (PVC-U) in the U.S. is sold in sizes from 1/2 to 8 in diameter and in three formulations: EPT-A-PVC, EPC-40-PBC, and EPC-80-PVC.