ZITHA SPECIALTYSPECIALTY FIBER CABLES Technical Inquiry

Fire-supporting optical cable

Fire-resistant optical cables are designed to maintain data transmission and signal integrity during fire emergencies, ensuring critical communication systems remain operational.Key Features

Continuous Operation During Fire: These cables are engineered to maintain optical signal integrity under extreme heat and flame exposure, often tested to standards such as IEC 60331-25, FE180, and CPR B2ca . They can operate for several hours in fires reaching temperatures up to 750°C . Safety and Environmental Compliance: Fire-resistant optical cables typically feature low smoke, zero halogen (LSZH) sheaths, minimizing toxic emissions and smoke during a fire, which protects both personnel and sensitive equipment . Mechanical Durability: Many designs include armoring with steel wire braiding or corrugated steel tape, providing resistance to impact, bending, and environmental stress, while protecting fibers from rodents and mechanical damage . Fiber Types and Configurations: These cables are available in singlemode (OS2, G652.D, G657 A, G655) and multimode (OM1, OM2, OM3, OM4) variants, with core counts ranging from 2 to 512 fibers. Loose tube constructions with gel-filled tubes or bend-insensitive fibers ensure long-term performance .

Applications

Fire-resistant optical cables are widely deployed in critical infrastructure where uninterrupted communication is essential:

  • Life safety systems: Fire alarms, voice alarm (VA) and voice evacuation systems
  • Public buildings and transportation: Tunnels, metro lines, airports, and railway networks
  • Industrial and data centers: Hospitals, industrial plants, and high-risk facilities requiring continuous connectivity
Standards and Certifications

These cables comply with international fire safety and performance standards:

  • IEC 60331-25: Fire resistance for circuit integrity
  • IEC 60332-2-3: Flame retardancy
  • CPR Euroclass B2ca, Cca, Dca: Construction product regulations for fire performance
  • UL, Bureau Veritas, DNV: Additional quality and safety certifications
Advantages
  • Ensures network resilience during emergencies
  • Reduces secondary damage to electronic equipment
  • Supports flexible deployment in indoor/outdoor, vertical shafts, and tight bending installations
  • Provides long-term reliability in harsh environments Fire-resistant optical cables are essential for any infrastructure where safety, regulatory compliance, and uninterrupted communication are critical, combining advanced optical performance with robust fire protection.
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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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