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.
Article 352 - Rigid Polyvinyl Chloride Conduit: Type PVC II. Installation. 352.10 Uses Permitted. The use of PVC conduit shall be permitted in accordance with 352.10(A) through (H). (F) Exposed. PVC conduit shall be permitted for exposed work. PVC conduit used exposed in areas of physical damage shall be identified for the use.