2017 Cable Tray Standards

The 2017 cable tray standards are primarily defined by NEMA VE 1-2017 for metal trays and NEMA FG-1/UL 568 for nonmetallic trays, harmonized with NEC and CEC requirements.

NEMA V

E 1-2017 – Metal Cable Tray SystemsNEMA VE 1-2017 specifies manufacturing requirements for metal cable trays including ladder, ventilated, solid bottom, channel, single-rail, wire mesh, and trough types, along with associated fittings. It provides load/span class designations and ensures compliance with the National Electrical Code (NEC) and Canadian Electrical Code (CEC), Part I, as the standard has been harmonized without deviation for Canadian use (CSA C22. 2 #126.

1). The standard covers aluminum, steel, stainless steel, and galvanized steel trays, addressing corrosion resistance, mechanical strength, and proper installation practices.

NEM

A FG-1 and UL 568 – Nonmetallic Cable Tray SystemsFor fiberglass or other nonmetallic trays, NEMA FG-1 (rescinded in November 2017) and UL 568 define construction, testing, and performance requirements. These standards cover ladder, ventilated, solid bottom, and channel-type trays intended for power and control cables, ensuring safe application and compliance with NEC rules.

U

L 568 specifies performance criteria for fiberglass trays, including mechanical strength, fire resistance, and environmental durability.

IE

C 61537 – International StandardIEC 61537 provides global guidelines for cable tray systems, including metal and nonmetallic trays. It specifies construction requirements, load testing, corrosion resistance, and electrical continuity. Compliance ensures safety, durability, and compatibility across international installations, making it relevant for projects outside North America or for multinational engineering standards.

Key Considerations

Material Selection: Aluminum, steel, stainless steel, and fiberglass are chosen based on environmental conditions, corrosion resistance, and mechanical requirements. Installation Guidelines: Proper handling, support spacing, bend radius, and grounding are critical for compliance and safety. Maintenance and Modifications: Standards provide guidance for inspection, system modification, and long-term maintenance to ensure continued performance.

Harmonization: NEMA VE 1-2017 aligns with CSA C22. 2 and NEC, ensuring consistent requirements across the U. S. and Canada.

In summary, the 2017 cable tray standards provide comprehensive guidance for the design, manufacture, installation, and maintenance of both metal and nonmetallic cable tray systems, ensuring safety, structural integrity, and regulatory compliance in accordance with NEC, CEC, and international standards.