Product Construction Conductor: 22 thru 12 AWG annealed stranded tinned copper and bare copper per ASTM B-33 Insulation: Color coded PVC insulation Shield: 100% coverage Mylar/aluminum foil shield, 25% overlap, foil facing out Stranded tinned copper drain wire Jacket: Chrome gray PVC. Product Construction Conductor: 22 thru 12 AWG annealed stranded tinned copper and bare copper per ASTM B-33 Insulation: Color coded PVC insulation Shield: 100% coverage Mylar/aluminum foil shield, 25% overlap, foil facing out Stranded tinned copper drain wire Jacket: Chrome gray PVC. us-trations without notice. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned. en completely installed, without damage either to conductors or structural system use maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when. Our cable tray design considerations guide details key factors to consider when designing cable tray systems for industrial and commercial applications.