JEWELBLU OPTICALFIBER PATCH CORDS Technical Inquiry

Are cable trays in vertical shafts fireproof

Cable trays in vertical shafts are not inherently fireproof; fire protection requires proper firestopping, coatings, and UL-rated systems.Fire Resistance of Cable Trays

Cable trays themselves, including ladder or perforated types, are typically made of metal and can resist direct flame to some extent, but they do not prevent fire spread on their own. Fireproofing is achieved through additional measures such as fire-rated coatings, firestop packs, intumescent caulks, or fire-resistant mineral wool applied around the tray and cables . These measures are essential in vertical shafts where fire can rapidly travel between floors.

Firestopping Requirements

When cable trays pass through walls, floors, or vertical shafts, all openings must be tightly sealed using approved firestopping materials to maintain the fire-resistance rating of the shaft . Large openings often require a fire-resistant backing plate or multi-component systems like firestop pillows or composite sheets to ensure complete sealing while allowing future cable additions . The system must meet F-Rating (flame containment) and T-Rating (temperature rise limitation) as specified by building codes such as the International Building Code (IBC), .

Fireproofing Measures
  • Fireproof coatings and tapes (e.g., FLAMMOTECT-A, DG-CR 0.7) can be applied to cables within trays to delay flame propagation .
  • Intumescent caulks and putty expand under heat to seal gaps and protect structural elements .
  • Periodic inspection and maintenance are required to ensure coatings and seals remain effective over time .
  • Perforated or mesh trays improve airflow and reduce heat accumulation, which indirectly enhances fire safety .
Key Takeaway

Cable trays in vertical shafts are not automatically fireproof. Fire safety depends on proper installation of firestopping systems, fire-resistant coatings, and adherence to UL-listed or code-approved assemblies. Without these measures, vertical shafts can act as conduits for fire and smoke, compromising building safety .

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Where cables pass through shafts, walls, slabs, or enter electrical panels or cabinets, openings shall be tightly sealed

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Use this product in new construction or update your fire protection in a renovation - the optional mounting bracket opens easily

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In plenum spaces, standard plastic cable ties are not permitted; instead, fire-rated ties must be used to reduce the risk

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For large vertical shafts (Electrical Shafts / Risers) that run from the basement to the top floor, a special fire-rated powder compound

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