Classification of Applications of Flame-Retardant Optical Cables for Smart Buildings
Smart buildings typically use plenum-rated (OFNP), riser-rated (OFNR), and general-purpose (OFN/OFNG) flame-retardant optical cables, often with LSZH jackets for low smoke and halogen-free performance.
Key Types of Flame-Retardant Optical Cables
Plenum-Rated Cables (OFNP / OFCP)
- Designed for plenum spaces, such as air ducts and ceiling voids, where air circulation occurs.
- Offer the highest flame resistance and are rated for both flame and smoke generation.
- Can be non-conductive (OFNP) or conductive (OFCP) if armored with metal for additional protection.
- LSZH versions reduce toxic gas emissions in case of fire, enhancing safety in enclosed public areas .
Riser-Rated Cables (OFNR)
- Intended for vertical shafts or riser backbones connecting floors.
- Flame-retardant but held to a lower standard than plenum cables.
- Self-extinguishing within a short distance of flame spread, typically 5 meters, and may also use LSZH materials to minimize smoke and toxicity .
General-Purpose Cables (OFN / OFNG)
- Suitable for horizontal runs or areas with less stringent fire requirements.
- Provide basic flame resistance and are often used in non-critical indoor spaces.
- LSZH variants are preferred to reduce smoke and toxic emissions .
Cable Jacket Materials
- LSZH (Low Smoke Zero Halogen): Minimizes smoke, toxicity, and corrosive gases during combustion, making it ideal for indoor smart building environments .
- PVC (Polyvinyl Chloride): Previously common for flame retardancy but produces toxic smoke and corrosive gases when burned, now largely replaced by LSZH in modern installations .
Fire Rating Standards
- NEC Ratings (US): OFNP (Plenum), OFNR (Riser), OFN/OFNG (General Purpose) define flame resistance levels.
- CPR (EU): Cables are classified from Eca to B1ca based on flame propagation tests, ensuring compliance with European construction regulations .
Deployment Considerations in Smart Buildings
- Plenum cables are used in air-handling spaces to prevent fire and smoke spread.
- Riser cables are used in vertical shafts connecting floors.
- General-purpose cables are used in horizontal or less critical areas.
- LSZH jackets are preferred in all indoor applications to enhance safety and reduce toxic emissions during fire incidents .
By selecting the appropriate flame-retardant optical cable type and jacket material, smart buildings can ensure fire safety compliance, minimal smoke hazards, and reliable network performance.
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