The Fire Resistant Fiber Optic Cable Central Loose Tube is engineered to maintain communication integrity during fire incidents. Designed for emergency and mission-critical systems, it delivers reliable optical performance, strong mechanical protection, and certified fire survival in demanding environments.
The D-connect Fire Resistant Fiber Optic Cable Central Loose Tube is purpose-built for applications where continuous communication during fire conditions is essential. Its central loose tube structure provides mechanical protection and flexibility, making it suitable for harsh and high-risk environments.
A mica tape fire barrier surrounds the optical fibers, ensuring exceptional flame resistance and helping maintain circuit integrity during fire exposure. The cable is reinforced with metallic armor, protecting against mechanical stress, external impact, and rodent damage, while enhancing long-term durability.
The LSZH-UV outer sheath is flame-retardant, low smoke, and halogen-free, minimizing toxic emissions and supporting safer evacuation during emergencies. Designed and tested to meet IEC 60331-25, this fire survival fiber optic cable is ideal for emergency systems requiring uninterrupted operation.
With high optical reliability, strong environmental resistance, and proven fire performance, this central loose tube fire resistant fiber optic cable is an excellent choice for bulk infrastructure projects where safety, compliance, and operational continuity are critical.
IEC 60793-1: Optical Fiber – Part 1: Generic Specification
IEC 60793-2: Optical Fiber – Part 2: Product Specification
IEC 60794-2: Optical Fiber Cables – Part 2: Indoor Cables – Sectional Specification
ITU-T G.650: Definitions and Test Methods for Single-Mode Fiber Parameters
ITU-T G.652: Characteristics of Single-Mode Optical Fiber and Cable
ITU-T G.655: Characteristics of Non-Zero Dispersion-Shifted Single-Mode Optical Fiber and Cable
ITU-T G.657: Characteristics of Bending-Loss Insensitive Single-Mode Optical Fiber
IEC 60331-25: 750°C for 120 minutes (Fire Survival Test)
BS 6387 C: 950°C for 180 minutes (Fire Survival Test)
Heat Barrier: Double Mica Tape
Sheathing: Red LSZH, UV Resistant Inner & Outer Jacket
| Category | Parameter | Specification / Result |
| Mechanical | Bending Radius (IEC 60794-1-2-E11A) | Static: 20 × D |
| Dynamic: 15 × D (D = Cable Diameter) | ||
| Â | Tensile Strength (IEC 60794-1-2-E1) | Permanent: 1600 N |
| Installation: 2500 N | ||
|  | Crush Resistance (IEC 60794-1-2-E3) | 2000 N (100×100 mm, 60 sec) ≈ 100 N / 10 cm |
|  | Temperature Range (IEC 60794-1-2-F1) | -30°C to +70°C |
| Â | Water Penetration (IEC 60794-1-2-F5B) | 1 m Water Head, 3 m Cable Sample, 24 Hours |
| General | Fiber Count | 4 to 12 Cores |
| Â | Strength Members | Water Blocking Glass Yarn |
| Â | Fire Resistance | Mica Tape |
| Â | Armoring | Corrugated Steel Tape (ECCS) |
| Â | Outer Jacket | LSZH-UV (Low Smoke Zero Halogen, UV Resistant) |
|  | Outer Diameter (±0.5 mm) | 11.5 mm (2/6 Core), 12.2 mm (12 Core) |
| Â | Cable Weight | 175 kg/km |
| Type Tests Summary | Tensile Test (IEC 60794-1-2-E1) | Load: Max tension |
| Duration: 1 min | ||
| Result: ΔAttenuation ≤ 0.4 dB, No damage | ||
| Â | Crush Test (IEC 60794-1-2-E3) | Load: 2000 N |
| Duration: 1 min | ||
| Â | Sample Length | Minimum 50 meters |
| Fiber Type | UNITS | SPECIFICATION | |
| Fiber Type | Â | G652D | |
| Attenuation | dB/km | Before Cable | After Cable |
| 1310 nm≤ 0.34 | 1310 nm≤ 0.35 | ||
| 1550 nm≤ 0.21 | 1550 nm≤ 0.24 | ||
| Chromatic Dispersion | ps/nm.km | 1310 nm≤ 3.5  | |
| 1550 nm≤ 18  | |||
| 1625 nm≤ 22  | |||
| Zero Dispersion Slope | ps/nm2.km | 0.093 | |
| Zero Dispersion Wavelength | nm | 1300 ~ 1324 | |
| PMD (M=20, Q=0.01%) | ps/√km | ≤ 0.2 | |
| Cut-off Wavelength (cc) | nm | ≤ 1260 | |
| Attenuation vs. Bending | dB | ≤ 0.1 at 1625 nm | |
| (60mm x100turns) | (60mm x100turns) | ||
| Mode Field Diameter | µm | (8.6-9.5) ±0.7@1310nm | |
| Core-Clad Concentricity | µm | ≤ 0.5 | |
| Cladding Diameter | µm | 125±2 | |
| Cladding Non-circularity | % | ≤ 0.8 | |
| Coating Diameter | µm | 245±5 | |
| Part Number | Description |
| FC-04-LZ-B-OS2-STA-60331-25 | Fire Resistant Fiber Optic Cable CLT (Gel Filled) Steel Tape Armored / Mica Tape, 4 Core, Single-mode OS2, LSZH-UV, G.652D, Black, IEC 60331-25Â |
| FC-06-LZ-B-OS2-STA-60331-25 | Fire Resistant Fiber Optic Cable CLT (Gel Filled) Steel Tape Armored / Mica Tape, 6 Core, Single-mode OS2, LSZH-UV, G.652D, Black, IEC 60331-25 |
| FC-08-LZ-B-OS2-STA-60331-25 | Fire Resistant Fiber Optic Cable CLT (Gel Filled) Steel Tape Armored / Mica Tape, 8 Core, Single-mode OS2, LSZH-UV, G.652D, Black, IEC 60331-25 |
| FC-12-LZ-B-OS2-STA-60331-25 | Fire Resistant Fiber Optic Cable CLT (Gel Filled) Steel Tape Armored / Mica Tape, 12 Core, Single-mode OS2, LSZH-UV, G.652D, Black, IEC 60331-25 |
D-CONNECT Fire Resistant Fiber Optic Cables are designed for mission-critical environments where maintaining communication during fire incidents is essential. Ideal for:
• Emergency communication systems
Ensures continuous operation of vital voice and data systems during fire emergencies.
• Public address and evacuation systems
Supports reliable transmission for PA and emergency evacuation announcements.
• Fire detection and alarm systems
Maintains connectivity for fire detection sensors and alarm triggers in high-risk areas.
• Data backup infrastructure in critical environments
Preserves connectivity for backup systems to prevent data loss during fire-related outages.
• Airports, tunnels, metros, high-rise buildings, and industrial plants
Perfect for infrastructure where fire survival and robust communication are mandatory.
