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Fireproof partition profiles for cable trays

Fiber and communications infrastructure knowledge brief Published 22 Feb 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.

Fireproof partitions for cable trays include fireproof boards, coatings, bags, intumescent sheets, and composite systems designed to prevent fire spread and ensure compliance with safety standards.

Common Fireproof Partition Types

Fireproof Boards and CoatingsMaterials: Fire-resistant boards, intumescent coatings, or fireproof mud. Advantages: Simple installation, good fire resistance, effective in preventing fire spread. Disadvantages: Can be heavy, occupy space, and may require maintenance or repainting over time.

Fireproof Bags and Packs

Materials: Mineral wool or firestop packs placed around cables. Advantages: High strength, easy to install in gaps, good heat dissipation. Disadvantages: Fire resistance may vary, installation can be complex for large trays.

Intumescent Composite Sheets

Example: 3M™ Fire Barrier Composite Sheet CS-195+ combines steel, intumescent material, wire mesh, and aluminum foil. Advantages: Lightweight, easy to cut and install, provides up to 4 hours of fire protection, excellent smoke and flame sealing, and helps dissipate heat to reduce cable derating. Applications: Suitable for larger penetrations and both horizontal and vertical cable tray runs.

Firestop Putties and Caulks

Example: 3M Fire Barrier Moldable Putty+ and IC 15WB Caulk. Advantages: Conformable, easy to mold around cables, UL-listed, reusable for retrofits, and effective in sealing openings against fire and smoke. Applications: Ideal for smaller openings or when retrofitting existing installations.

Material Considerations

Durability: Choose materials resistant to water, rodent damage, and environmental conditions. Heat Dissipation: Intumescent sheets and mineral wool help prevent overheating of cables. Compliance: Look for UL, EN 61537, or ASTM E 814 certifications to ensure regulatory compliance.

Installation: Consider ease of installation, maintenance requirements, and space constraints.

Procurement and Application Tips

Project Scale: For large-scale industrial projects, composite sheets or partitioned cable trays with fireproof coatings are preferred. Environment: Use stainless steel or hot-dip galvanized partitions depending on corrosive or wash-down conditions. Cost vs Performance: Budget-friendly options like fireproof coatings are suitable for small-scale projects, while premium fireproof partitioned trays offer higher protection at a higher cost.

Maintenance: Regular inspection and replacement may be required for coatings and putties to maintain fireproof performance. By selecting the appropriate fireproof partition model based on material, fire rating, installation environment, and compliance requirements, you can effectively prevent fire spread along cable trays and ensure the safety and reliability of electrical installations.

Fireproof partition profiles for cable trays - METRA FIBER MARKET [PDF]

Fireproof partition profiles for 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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