Channels for cable tray mounting shall be formed from stainless steel complying with BS EN 10088-2 Grade 1. 5mm clearance holes for cable fixing. The sides of trays shall be 180o return flanged for rigidity and minimizing damage to cable sheath and injury. This standard specifies the requirements for nonmetallic cable trays and associated fittings designed for use in accordance with the rules of the Canadian Electrical Code (CEC) Part 1, and the National Electrical Code® (NEC). Covers construction and test requirements for. Stainless steel cable trays are manufactured in light, medium and heavy duty return flange ranges in both 304 and 316 grades stainless steel - extensively specified for cable containment and cable support in oil, gas, petrochemicals, rail, offshore, marine, nuclear, food processing and heavy. Stainless steel cable trays are made of 304, 316 grade stainless steel, which are designed into channel style, ladder style, perforated style.