INDUS FIRE RESISTANT CABLE 4mm² x 4-Core

FR CABLE 4 x 4mm² Hard Skin Enhanced Fire Resistant Cable – 300/500V (LSZH, Fire-Survival Grade)

• Application: Designed for fire detection, alarm, voice alarm, and emergency lighting circuits.
• Fire Performance: Maintains circuit integrity in fire scenarios (PH30, PH60, PH120 rated).
• Fire Resistance Grade: Enhanced grade, suitable for prolonged fire operation beyond single-phase evacuation needs.
• Voltage Rating: 300/500V as per fire safety system standards.
• Conductor Type:
•   - 1.5mm² to 2.5mm²: Class 1 solid conductor (BS EN 60228)
•   - 4mm²: Class 2 stranded conductor (BS EN 60228)
• Insulation: Fire-resistant Mica/Glass tape + high-performance fire-resistant silicone rubber.
• Screen: AL/PET (Aluminium/Polyester tape) overall screen.
• Circuit Protective Conductor: Tinned copper for added fire performance and corrosion resistance.
• Outer Sheath: LSZH (Low Smoke Zero Halogen) for low toxicity and smoke in fire.
• Operating Temperature: -40°C to +90°C for extended durability in harsh environments.
• Minimum Bending Radius: 6 × overall diameter for safe cable routing.
• Core Identification:
•   - 4-Core: Blue, Brown, Black, Grey + Bare Earth
• Applicable Standards:
•   - BS 5839-1:2013 Clause 26.2e
• Fire Test Durability: Proven to withstand fire conditions for up to 120 minutes (BS 8434-2).
• RoHS Compliance: Fully compliant with RoHS directive for hazardous substances.
• Quality Assurance: All electrical and physical parameters tested in-house for resistance, consistency, and construction.
• Mentioned Prices are in Meters.

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FR CABLE 4 × 4 mm² Hard-Skin Enhanced Fire-Resistant Cable – 300/500 V (LSZH, Fire-Survival Grade)

Introduction

In critical life-safety systems, uninterrupted power to fire detection loops, alarm panels, voice evacuation, and emergency lighting can save lives. The FR CABLE 4 × 4 mm² Hard-Skin Enhanced Fire-Resistant Cable delivers exactly that. It combines rugged mechanical protection with proven fire-survival materials and low-smoke, zero-halogen (LSZH) compounds. Consequently, this cable sustains circuit integrity under extreme fire conditions while minimizing toxic gas release for safer evacuations.

Exceptional Fire Survival

We engineer this cable to meet PH30, PH60, and PH120 classifications. As a result, it maintains full load operation for up to 120 minutes at 300/500 V even when directly exposed to flames exceeding 750 °C. Independent tests confirm that the cable’s resistance and voltage drop remain within tolerance throughout prolonged fire exposure. Therefore, your alarms and emergency lights stay energized until everyone reaches safety.

Voltage Rating & Conductor Construction

Rated for 300/500 V, this cable suits standard fire-safety circuits without risking overload. We offer:

• 1.5 mm²–2.5 mm² cores: Class 1 solid copper (BS EN 60228) for steady current delivery.

• 4 mm² cores: Class 2 stranded copper (BS EN 60228) for added flexibility in tight bends.
  By matching conductor type to load requirements, you avoid voltage drop and reduce installation time.

Advanced Fire-Resistant Insulation

Mica/Glass Tape Layer: We wrap each conductor in a 0.12 mm band of inorganic mica/glass tape. This barrier resists direct flame, preventing core failure and sheath collapse.
Silicone-Rubber Overmold: Over the tape, we apply fire-rated silicone rubber that remains flexible under heat. Consequently, the cable resists cracking and water ingress—even after extended fire exposure.

Enhanced Screening & Outer Sheath

Next, we apply an AL/PET (aluminium/polyester) overall screen. This layer reflects radiant heat and blocks electromagnetic interference. Finally, we encase the assembly in a 1.70 mm LSZH hard-skin sheath. Therefore, the cable withstands mechanical abuse and emits minimal smoke and no halogen gases during fire exposure, protecting both property and occupants.

Mechanical Durability & Temperature Range

The hard-skin jacket resists abrasion, impact, and crushing during installation. Moreover, the cable performs reliably from –40 °C to +90 °C, making it suitable for unheated plant rooms and sun-exposed rooftop trays alike. With a minimum bending radius of six times the cable diameter, you can route it through tight conduits without damaging internal cores.

Installation Aids & Identification

To speed up terminations, we print clear polarity and phase markings on the sheath every meter. In addition, four color-coded cores—Blue, Brown, Black, and Grey—plus a bare earth conductor simplify wiring. Because all cores share one sturdy jacket, you complete cable pulls more quickly and reduce installation errors.

Compliance & Quality Assurance

We manufacture this cable to exceed:

• BS 5839-1:2013 Clause 26.2(e) for fire-alarm circuits

• BS 8434-2 for up to 120 minutes of fire resistance

• RoHS Directive for zero hazardous substances

Each reel undergoes rigorous in-house testing—verifying electrical continuity, insulation resistance, and fire performance. Consequently, you receive a code-compliant, high-quality cable every time.

Applications & Project Support

The FR CABLE 4 × 4 mm² serves a wide range of life-safety installations, including:

• Fire detection and alarm loops

• Voice-evacuation and public-address circuits

• Emergency lighting and exit signage

• Firefighter communication lines

Furthermore, our engineering team offers layout reviews, tray-fill calculations, and onsite training to ensure a seamless, compliant installation from design through commissioning.

Conclusion

By integrating mica/glass fire shields, silicone-rubber insulation, AL/PET screening, and an LSZH hard-skin jacket, the FR CABLE 4 × 4 mm² achieves unmatched fire-survival performance. It maintains circuit integrity for two hours, resists mechanical and environmental stresses, and prioritizes occupant safety with minimal smoke. When seconds matter most, specify this cable for uncompromised life-safety reliability.

Contact Us

For detailed data sheets, custom lengths, or project consultation, please contact our fire-safety specialists today. We’ll help you design and deploy a code-compliant solution that safeguards both property and lives.