NEMA FG 1 – This standard specifies the manufacturing requirements for nonmetallic (fiberglass) cable trays (such as; ladder cable tray trough or ventilated cable tray, solid bottom or nonventillated cable tray and channel cable tray) and associated fittings for use in accordance. NEMA FG 1 – This standard specifies the manufacturing requirements for nonmetallic (fiberglass) cable trays (such as; ladder cable tray trough or ventilated cable tray, solid bottom or nonventillated cable tray and channel cable tray) and associated fittings for use in accordance. 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. ies aluminum alloys (Aluminum Association designation) to manufacture cable tray. The alloys are selected for their mechanical properties, such as strength and hardness, as well as for their resis ance to corrosion, particularly stress corrosion, cracking, and pitting co anufactured using a. Are you selecting cable trays for a chemical plant, a coastal facility, or a food processing zone? Fiber Reinforced Plastic (FRP, or fiberglass) trays are the prime choice for their superior corrosion resistance and electrical insulation. This process brings together volunteers and/or seeks out the views of persons who have an interest in. For International Standards, the manufacturer shall declare the tray system Safe Working Load (SWL) per the International Electrotechnical Commission (IEC) 61537 and publish in the form of a table or diagram. span is based on maximum deflection measured from the mid-point between supports. Key Insight: BS EN 61537 is technically identical to IEC 61537 but includes UK-specific guidance and deviations. Head-to-Head Comparison: Critical Differences This is the single biggest difference between standards.