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Fire Resistant Fiber Optic Cable
Fire Resistant Fiber Optic Cable
Fire resistant fiber optic cable is designed for communication lines that must keep operating during fire conditions in tunnels, public buildings, transport infrastructure, alarm networks and other critical installations.
This central loose tube construction combines fire resistant LSZH layers, synthetic mica tape, water-blocking elements and corrugated steel tape armor to support circuit integrity for up to 30, 60, 90, 120 and 180 minutes, depending on project requirement and test scenario.
For projects where fire performance, low smoke behavior, rodent protection and outdoor durability must be balanced in a single construction, this cable provides a practical indoor/outdoor option with UV-stabilized outer sheath and dependable mechanical protection.
Fire Resistant Fiber Cable Overview
Built for signal continuity
The main role of a fire resistant fiber cable is not just to resist flame spread. It is to preserve optical transmission long enough for emergency communication, alarm signaling, shutdown procedures or controlled evacuation.
Balanced indoor and outdoor use
The LSZH-UV outer sheath makes the cable suitable for demanding routes where low smoke performance is required indoors, while UV stability supports outdoor exposure and duct-based deployment.
Practical installation profile
Its compact central loose tube design is suitable for pulling, pushing or blowing in selected routes where fire survival and mechanical reliability are both required.
Fire resistant is not the same as flame retardant: a fire resistant cable is tested to maintain circuit integrity for a defined period. A flame-retardant cable is intended to limit flame propagation but may stop transmitting. CPR classes separately describe reaction-to-fire performance in construction works and do not replace circuit-integrity testing.
Where to Use Fire Resistant Fiber Cable
Fire resistant fiber cable use cases
- Fire alarm and voice alarm systems
- Tunnels, metro lines and transport infrastructure
- Public buildings with evacuation and life-safety requirements
- Critical communication backbones in industrial or utility sites
- Indoor or duct routes where low smoke and circuit integrity are both required
Why designers specify this construction
- Continued communication during fire exposure
- LSZH behavior for smoke and corrosive gas control
- Steel tape armor for rodent and impact protection
- Red outer sheath for fast visual identification
- Indoor/outdoor flexibility to simplify project logistics
Fire Resistant Fiber Cable Construction
Core structure
The cable is based on a central loose tube design with water-blocking glass yarn, fire resistant inner jacket layers and a longitudinal fire barrier based on mica tape. This construction is chosen to maintain optical function while improving thermal resilience and mechanical stability.
Armor and outer protection
Corrugated steel tape is used as the main armor layer to improve crush performance and rodent resistance. The outer sheath is a fire resistant LSZH-UV compound in red color, supporting both safety coding and weather exposure.
Fiber options
Common project options include OM1, OM3, OM4, OM5 multi-mode and OS2 single-mode fibers. Depending on system design, bend-optimized fiber options may also be specified for tighter routing conditions.
Installation profile
The cable is suitable for critical network routes in MAN, WAN and LAN environments, as well as duct installations where a lighter and more compact construction is preferred over heavier specialty designs.
Technical Specifications
| Fiber count | 4-24 fibers |
|---|---|
| Fiber types | OM1, OM3, OM4, OM5 multi-mode and OS2 single-mode options |
| Strength members | Water blocking glass yarn |
| Loose tube diameter | 2.8 mm |
| Inner jacket | Fire resistant LSZH |
| Armor | Corrugated steel tape |
| Outer jacket | Fire resistant LSZH-UV, red outer sheath |
| Approx. cable weight | 170 kg/km |
| Outer diameter | Approx. 12.0 mm |
| Tensile load | 1600 / 2500 N (perm / inst) |
| Crush resistance | 2000 N (IEC 60794-1-2 E3) |
| Temperature range | -30 °C to +70 °C (IEC 60794-1-2 F1) |
| Minimum bending radius | 20 x outer diameter (IEC 60794-1-2 E11) |
| Reference optical characteristic | 50/125 OM2, 850 / 1310 nm, attenuation max. 3.0 / 1.0 dB/km |
Note: fiber type, core count and exact construction details can be configured according to project scope, fire requirement and installation environment.
Fire Resistant Fiber Cable Standards and Compliance
IEC 60331-25 defines circuit-integrity testing for optical fibre cables exposed to fire. IEC 60754-2 covers the acidity and conductivity of gases released during combustion, while IEC 61034-2 covers smoke density. The IEC 60794 series, TIA/EIA-568-C.3 and Telcordia GR-409-CORE address relevant optical cable performance and application requirements.
What the fire standards cover
- IEC 60331-25 addresses circuit integrity testing for optical fibre cables under fire exposure.
- IEC 60754-2 evaluates the corrosivity and acidity of gases evolved during combustion.
- IEC 61034-2 measures smoke density under defined burning conditions.
- EN 50575 / CPR is used in building applications to classify reaction to fire.
Fire resistant vs flame retardant vs CPR
Fire-resistant performance concerns continued operation during fire. Flame-retardant performance concerns limiting flame propagation. CPR under EN 50575 classifies a cable's reaction to fire in construction works, including flame spread, heat release and, where applicable, smoke, flaming droplets and acidity. A CPR class does not by itself demonstrate circuit integrity.
FAQ About Fire Resistant Fiber Cable
What does FE180 / PH120 mean on a fire resistant fiber cable?
FE180 generally refers to maintaining circuit integrity during fire exposure, while PH120 is used for defined fire-and-mechanical-shock performance conditions. In plain terms, these ratings indicate that the cable is designed to keep the communication path alive during a fire for a defined period.
Is fire resistant fiber cable the same as CPR B2ca cable?
No. They describe different performance areas. Fire resistant cable focuses on continued function during fire. CPR classes such as B2ca describe reaction to fire in building applications, including flame spread, smoke, droplets and acidity behavior.
Can this fire resistant fiber cable be used outdoors?
Yes. The UV-stabilized outer sheath supports indoor, selected outdoor and duct routes. Final suitability must still be matched to the installation method, route protection and project specification.
Which fibre types are available in this fire resistant fiber cable range?
Common options include OM1, OM3, OM4, OM5 multi-mode and OS2 single-mode fibres. Exact fibre choice depends on transmission distance, active equipment and whether the project is backbone, horizontal distribution or life-safety related.
Why is steel tape armor used in this cable?
Corrugated steel tape improves crush resistance and rodent protection. It also helps the cable survive tougher physical environments than a purely non-metallic fire cable, especially in ducts, service routes and infrastructure corridors.
Is this cable only for fire alarm systems?
No. Fire alarm systems are one major use case, but the cable can also be selected for tunnels, metro lines, public buildings, industrial facilities and any route where communication continuity during fire is part of the design requirement.
Need the right fire-performance cable for a project?
If your specification needs fire survival, CPR alignment, mechanical protection and the correct fiber type in one construction, review the datasheet first and then match the cable to the route conditions, standards and core count required by the project.
