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Sealing of Three-Dimensional Cable Trays

Fiber and communications infrastructure knowledge brief Published 02 May 2024

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.

Three-dimensional cable trays can be effectively sealed using modular, fireproof, and watertight systems that ensure safety, compliance, and ease of maintenance. Types of Sealing Systems1. Modular Sealing Systems: Modular solutions, such as those offered by Roxtec and CSD Sealing Systems, allow flexible installation around multiple cables or cable trays.

These systems use frames that can be bolted, welded, or cast into walls and floors, providing protection against fire, water, gas, and electromagnetic interference. They support future cable additions or changes with minimal effort, following a “build as you grow” concept. 2.

Fireproof Pillows: Products like AF BAGS are intumescent and ablative pillows certified under EN 1366-3 for fire resistance up to EI 240. They consist of high-density intumescent compounds inside a non-combustible fiberglass casing, which can be inserted into cable tray penetrations without a surrounding frame. These pillows are repositionable, facilitate maintenance, and are suitable for walls, floors, and sandwich structures.

3. Weatherproof and Watertight Seals: Systems such as WSP weatherstops and NOFIRNO® duct seals provide watertight and gas-tight protection for cable trays, ducts, and manhole entries. They use coated steel frames, sponge rubber pads, and silicone-based sealants to create a durable seal that is resistant to corrosion, chemicals, and outdoor conditions.

These systems are easy to install and maintain, and they accommodate any cable size or quantity. Standards and ComplianceEN 1366-3: European standard for fire resistance of cable penetration seals, classifying performance based on cable groups and installation methods.

E

N 13501-2: Classification of fire performance for building products.

NEM

A 4X: Weatherproof and corrosion-resistant classification for outdoor applications.

U

L 1479: Standard for firestop systems, often referenced for modular seals.

Installation Considerations

Measure the cable tray dimensions and select the appropriate seal size and number of modules or pillows. Modular frames can be installed before or after cable installation, allowing easy maintenance and future cable additions. Fireproof pillows require correct depth and positioning to achieve certified fire resistance.

For wet or hazardous environments, use chemically neutral, non-toxic materials to ensure long-term durability. Consider the type of cables, conduits, or pipes, as metallic conduits may require thicker coatings for insulation and fire protection.

Advantages of Modern Sealing Systems

Flexibility: Accommodates multiple cable sizes and future expansions. Safety: Provides fire, water, and gas protection. Ease of Maintenance: Modular and pillow systems allow repositioning without dismantling the entire seal.

Standards Compliance: Certified to international fire and integrity standards, ensuring regulatory adherence. Durability: Resistant to corrosion, chemicals, and environmental exposure. In summary, sealing three-dimensional cable trays requires selecting a system that balances fire safety, watertightness, and flexibility.

Modular seals, fireproof pillows, and weatherproof frames are widely used solutions that comply with international standards and facilitate maintenance and future cable modifications.

Sealing of Three-Dimensional Cable Trays - METRA FIBER MARKET [PDF]

Sealing of Three-Dimensional 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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