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Fire resistance rating standard for ordinary cable trays

Fiber and communications infrastructure knowledge brief Published 09 May 2025

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

Ordinary fire-resistant cable trays typically have fire resistance ratings of E30, E60, or E90, indicating the number of minutes they maintain circuit integrity under fire conditions. Fire Resistance RatingsFire-resistant cable trays are designed to maintain the functionality of electrical circuits during a fire, ensuring critical systems like emergency lighting, alarms, and smoke extractors continue to operate. The most common ratings are: E30: Maintains circuit integrity for 30 minutesE60: Maintains circuit integrity for 60 minutesE90: Maintains circuit integrity for 90 minutes, often used in industrial or high-risk environments These ratings are determined by standardized fire tests, such as DIN 4102-12, which involve placing the complete cable tray system—including cables, supports, and accessories—inside an oven and exposing it to temperatures up to 1000°C for the specified duration.

The system passes the test if the cables remain functional and the tray maintains structural integrity throughout the fire exposure.

Factors Affecting Fire Resistance

The actual fire performance of a cable tray system depends on several variables: Tray material and thickness: Steel or coated metal trays generally perform better than unprotected aluminum or plastic traysCable loading and packing density: Overloaded trays may reduce fire resistanceMounting orientation and support spacing: Proper installation ensures maximum fire performanceJoint detailing and accessories: Fireproof cleats, wraps, or coatings can enhance resistance Practical ConsiderationsE30 trays are suitable for low-risk or secondary circuits. E60 trays are commonly used in commercial buildings and infrastructure projects.

E90 trays are preferred in industrial, petrochemical, or public spaces where evacuation times are longer and critical systems must remain operational. In summary, ordinary fire-resistant cable trays are tested and rated to maintain circuit integrity for 30, 60, or 90 minutes, with E90 being the most robust standard under DIN 4102-12 and similar international testing protocols. Proper selection should consider the risk level, cable type, and installation environment to ensure safety and compliance.

Fire resistance rating standard for ordinary cable trays - BAGYOU FIBRE NETWORKS [PDF]

Fire resistance rating standard for ordinary 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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