The 2024 National Standard for Cable Trays is defined by NEMA BI-50016, which provides comprehensive installation, handling, and maintenance guidelines for cable tray systems.

Overview of NEMA BI-50016-2024

NEMA BI-50016-2024, formerly known as VE2, is the current standard for cable tray installation in the United States. It addresses the shipping, handling, storing, and installation of cable tray systems, including both metal and nonmetallic types, and provides guidance on maintenance and system modifications . This standard ensures that cable tray systems are installed safely and efficiently in accordance with the National Electrical Code (NEC) and harmonized with the Canadian Electrical Code (CEC) where applicable .

Scope and Coverage

• Metal Cable Trays (NEMA VE1): Covers ladder, ventilated, solid bottom, single-rail, wire mesh, and trough-type trays. It specifies manufacturing requirements, load/span class designations, grounding, and connection methods .
• Nonmetallic Cable Trays (NEMA FG-1): Specifies requirements for fiberglass or other nonmetallic trays, including ladder, ventilated, solid bottom, and channel types, ensuring compliance with NEC and UL 568 performance standards .
• Installation Guidelines: BI-50016 provides detailed instructions for proper installation, including support spacing, alignment, and securing of trays to prevent mechanical stress or damage .
• Maintenance and Modifications: Offers guidance on system inspection, repair, and modifications, ensuring long-term reliability and safety .

Related Standards

• NEC Article 392: Governs the installation and ampacity considerations for cable trays .
• UL 568: Covers performance requirements for fiberglass cable trays .
• IEC 61537: International standard for cable tray systems, including metal and nonmetallic types .
• CSA C22.1 Part 1: Harmonized with NEMA VE1 for Canadian installations .

Key Points

• NEMA writes the technical standards but does not test or certify products; independent organizations like UL perform testing and certification .
• BI-50016-2024 is available in PDF format via ANSI Webstore and can be included in standards subscriptions for multi-user access .
• The standard is periodically reviewed to reflect advancing technology and construction techniques, ensuring ongoing relevance for engineers, contractors, and maintenance personnel . In summary, NEMA BI-50016-2024 serves as the authoritative guide for the safe and effective installation, handling, and maintenance of cable tray systems, providing a unified framework for compliance with NEC and related international standards.