Steel wire mesh cable trays are governed primarily by NEMA VE 1, NEMA BI 50015, UL classifications, and IEC 61537 standards, ensuring compliance with NEC and industry safety requirements.

Key Standards

NEMA VE 1 specifies manufacturing requirements for metal cable trays, including wire mesh types, covering construction, materials, load/span designations, and associated fittings for compliance with the National Electrical Code (NEC) (NEC Article 392) and Canadian Electrical Code (CEC) Part 1 . NEMA BI 50015 provides detailed technical guidelines for wire mesh cable trays, including dimensions, grounding, connection methods, and load capacities. It serves as a common reference for manufacturers, contractors, and engineers, while UL classification ensures independent testing and validation against NEMA and NEC requirements . IEC 61537 is the international standard for cable tray systems, including all-metal and wire mesh trays, specifying performance, testing, and installation requirements for electrical and communication systems . UL 568 covers performance requirements for safe application of fiberglass cable trays, but UL also provides testing and certification for steel wire mesh trays to ensure compliance with NEMA and NEC standards .

Material and Construction

Steel wire mesh trays are typically made from Q235 steel, SS304, or SS316 stainless steel, with finishes such as electro zinc plating (indoor), hot-dipped galvanizing (outdoor), or electrolytic polishing (stainless steel) . Standard widths range from 1.5 to 24 inches, depths from 1 to 4 inches, and lengths around 10 feet (118"). Custom sizes can be produced according to project requirements .

Installation Guidelines

Wire mesh trays are designed for short support spans of 4 to 8 feet, supported by trapeze, wall, floor, or channel mounting methods. Maximum loads must not exceed manufacturer specifications. They are suitable for temperature ranges from -40°C to +150°C without performance degradation . Cables should be tied down to maintain spacing, prevent sagging, and comply with NEC Section 392.8(B) for horizontal and vertical installations. Proper installation ensures safe routing of power, control, and communication cables .

Summary

For steel wire mesh cable trays, compliance with NEMA VE 1, NEMA BI 50015, UL classifications, IEC 61537, and NEC/CEC installation rules ensures safety, structural integrity, and interoperability. Material selection, finish, dimensions, load ratings, and proper installation are all critical to meet these standards and maintain long-term performance in industrial and commercial applications .