Latest version of cable tray classification standards

The most current international standard for cable tray systems is IEC 61537: 2023, complemented by NEMA VE 1 and UL 568 for North American compliance. International Standard: IEC 61537: 2023The IEC 61537: 2023 standard specifies requirements and testing methods for cable tray and cable ladder systems used to support and accommodate electrical and communication cables. This third edition replaces the 2006 version and includes technical revisions such as new annexes addressing the use of trays as protective earth conductors.

Key aspects covered include: Mechanical Strength: Load testing to ensure trays can support cables and environmental pressures. Corrosion Resistance: Material and coating requirements for durability in harsh environments. Electrical Continuity: Ensures trays can serve as grounding paths when tested.

Fire Resistance: Guidelines for performance under high temperatures, critical for hospitals, power plants, and industrial facilities. Ventilation and Fill Ratio: Recommendations for perforation and cable fill to prevent overheating. Installation Compatibility: Ensures compatibility with bends, risers, and accessories for seamless installation.

North American StandardsNEMA VE 1: Covers metal cable tray systems including ladder, ventilated, solid bottom, and wire mesh trays. It harmonizes with CSA C22. 2 #126.

1 for Canadian Electrical Code compliance and provides load/span designations, installation, and maintenance guidance.

U

L 568: Focuses on fiberglass (nonmetallic) cable trays, specifying construction, testing, and performance requirements for safe application.

Additional Guidance

The Cable Tray Institute provides practical installation guides for aluminum and steel trays, reflecting ongoing updates in technology and construction techniques. Compliance with these standards ensures safety, long-term performance, and legal supply in international and North American markets. In summary, for the latest and most authoritative guidance on cable tray systems, IEC 61537: 2023 should be referenced internationally, while NEMA VE 1 and UL 568 remain the primary standards in North America.