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Where should cable trays be covered

Fiber and communications infrastructure knowledge brief Published 01 Sep 2024

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Cable trays can be either open or covered, with covers used to protect cables from physical damage, environmental exposure, or interference.

Purpose of Cable Tray Covers

Cable tray covers, also called lidding, are sections that enclose the top of a cable tray to provide protection for the cables inside. They are not always required by code, but they are highly recommended in certain situations, such as high-traffic areas, outdoor installations, or where cables need shielding from sunlight, dust, or mechanical impact. Covers help maintain cable integrity, prevent accidental contact, and reduce electromagnetic interference in sensitive installations.

Types of Cable Tray Covers

Cable tray covers come in various designs and materials to suit different applications: Flat Tray Covers: Simple, flat covers that sit on top of the tray, suitable for general protection.

Dome or Hat-

Shaped Covers: Ideal for cables that extend above the tray edges, providing extra clearance and protection. Corrugated Tray Covers: Designed for added strength and rigidity, often used in industrial environments. Flanged Covers: Provide a secure fit and are often used where environmental sealing is important.

Materials commonly used include metal, composite, rubber, and plastic, with metal and composite being the most popular due to durability and fire resistance. Covers can be selected based on indoor or outdoor use, exposure to sunlight, or the need for electromagnetic shielding.

Installation Considerations

While the National Electrical Code (NEC) Article 392 does not mandate covers for all cable trays, it specifies that cables in trays must be suitable for open-air exposure, such as Type TC (Tray Cable) or metal-armored (Type MC) cables. Covers are particularly recommended when trays are installed in areas where tools or objects could fall on the cables, or where environmental conditions could degrade the cable insulation. Properly installed covers also facilitate maintenance by keeping cables organized and protected.

Summary

Cable trays can be open or covered depending on the installation environment and safety requirements. Covers enhance protection against physical damage, environmental factors, and interference, and are available in multiple designs and materials to meet specific needs. While not always required by code, using covers is a best practice in high-risk or outdoor installations.

Where should cable trays be covered - CJC FIBRE CONSULTANTS [PDF]

Where should cable trays be covered

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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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