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Code for Trough-type cable trays

Fiber and communications infrastructure knowledge brief Published 13 Dec 2023

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Trough-type cable trays must comply with NEC Article 392, NEMA VE 1, UL 568, and IEC-61537 standards for safe design, installation, and load handling. Key StandardsNEC Article 392 governs cable tray installations in the United States, specifying tray types, fill limits, cable types, and ampacity adjustments. Ventilated trough trays, which have a solid bottom with ventilation slots, provide moderate ventilation and support for medium-voltage cables while protecting against debris.

Solid-bottom trough trays offer maximum protection but require stricter fill rules due to reduced heat dissipation.

NEMA V

E 1 specifies manufacturing requirements for metal cable trays, including trough or ventilated trays, and provides load/span class designations. It harmonizes with CSA C22. 2 #126.

1 for Canadian installations.

U

L 568 covers performance requirements for fiberglass (nonmetallic) trough-type cable trays, ensuring safe application in electrical systems. IEC-61537 is an international standard covering all metal and nonmetallic cable trays, including trough types, for supporting and accommodating cables and electrical equipment. Material and Construction ConsiderationsTrough-type trays can be made from aluminum, steel, stainless steel, or fiberglass, with finishes selected based on environmental conditions and corrosion resistance.

Ventilated troughs typically have slots or holes ranging from 1/4 inch to 1 inch to allow airflow while maintaining cable support.

Installation and Fill Rules

Ventilated trough trays: Moderate ventilation, suitable for medium-voltage cables, some debris protection, and easier cable support than ladder trays. Solid-bottom trough trays: Maximum protection from fluids or debris, but heat dissipation is limited, requiring stricter fill calculations. Load and span: Follow NEMA VE 1 designations to ensure trays can safely support cable weight over the intended span.

Separation: Power and signal cables should be separated according to NEC guidelines to prevent interference.

Summary

For compliance and safety, trough-type cable trays must adhere to NEC 392, NEMA VE 1, UL 568, and IEC-61537 standards, considering material, ventilation, load capacity, and fill rules. Proper selection and installation ensure reliable cable support, heat dissipation, and protection from environmental hazards, while maintaining compliance with national and international electrical codes.

Code for Trough-type cable trays - METRA FIBER MARKET [PDF]

Code for Trough-type cable trays

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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