What is BS 7629-1 Enhanced Fire Resistant Cable?
The BS 7629-1 Enhanced Fire Resistant Cable is a 300/500V screened, halogen-free fire-survival cable engineered with Class 1 solid or Class 2 stranded copper conductors, Mica/Glass fire-barrier tape, high-performance silicone rubber insulation, a tinned copper earth drain wire, an Al/PET screen, and an LSZH outer jacket complying with BS 7629-1 standards. It is specifically engineered to ensure continuous circuit integrity during severe fires in critical detection, voice evacuation, and emergency lighting networks.
Unlike standard fire-rated cables, ‘Enhanced grade’ cables must withstand longer fire durations combined with mechanical shock and water spray under BS 8434-2 and BS 8519 Category 3 test conditions. This multi-layer barrier design ensures emergency communication and evacuation systems remain operational during extended phased evacuations in high-rise towers, transport hubs, and complex public facilities.
BS 7629-1 Enhanced Fire Resistant Cable Construction
- Conductor: Class 1 solid plain annealed copper (1.5mm² and 2.5mm²) or Class 2 stranded copper (4.0mm²) per EN 60228.
- Fire Barrier & Insulation: High-temperature Mica/Glass fire-resistant barrier tape wrapped around conductors, covered by high-performance fire-resistant silicone rubber.
- Screen System: Aluminium/Polyester tape (Al/PET) providing 100% electrostatic shielding against electrical interference.
- Circuit Protective Conductor (CPC): Integrated tinned copper earth drain wire running in direct contact with the metallic foil screen.
- Outer Sheath: UV-stabilized, flame-retardant Low Smoke Zero Halogen (LSZH) thermoplastic compound.
- Core Identification: 2 cores: Blue, Brown + Bare Earth; 3 cores: Brown, Black, Grey + Bare Earth; 4 cores: Blue, Brown, Black, Grey.
- Sheath Colour: Standard Red or White (available in customized colours upon request).
Applications
BS 7629-1 Enhanced Fire Resistant Cables are engineered for life-safety systems in complex buildings where multi-phase evacuation requires prolonged circuit operation.
- Emergency Voice Alarm & Communication Systems: Maintaining audio clarity and control commands for voice sounder networks per BS 5839-1.
- Critical Fire Detection & Alarm Circuits: Linking multi-sensor detectors, manual call points, and main alarm control panels.
- Emergency Lighting & Signage Paths: Powering central battery systems and escape lighting networks adhering to BS 5266-1.
- High-Rise & Large Public Venues: Fire-survival wiring in airports, rail stations, shopping malls, and hospitals requiring BS 8519 Category 3 compliance.
Specifications & Dimensions
The BS 7629-1 Enhanced cable portfolio comprises 2-core, 3-core, and 4-core designs across conductor cross-sections of 1.5mm², 2.5mm², and 4.0mm² (with 1.0mm² electrical reference ratings available). Rated for an operating voltage of 300/500V and an operating temperature range of -40°C to +90°C, the cable requires a minimum bending radius of 6 times the overall diameter. Nominal outer diameters range from 8.8mm on 2-core 1.5mm² cables to 14.4mm on 4-core 4.0mm² cables, with nominal cable weights spanning 105 kg/km to 350 kg/km. Clipped direct current ratings reach up to 45A (2-core) and 40A (3/4-core), while maximum DC conductor resistance at 20°C ranges from 12.1 Ω/km (1.5mm²) down to 4.61 Ω/km (4.0mm²), with full adherence to BS 7629-1 manufacturing tolerances.
| NO. OF CORES | NOMINAL CROSS SECTIONAL AREA mm² | INSULATION RADIAL THICKNESS mm | GALVANISED STEEL ARMOUR WIRE DIAMETER mm | OUTER SHEATH RADIAL THICKNESS mm | OUTER SHEATH DIAMETER mm | NOMINAL WEIGHT kg/km |
| 2 | 4 | 0.7 | 1.25 | 1.4 | 23.9 | 950 |
| 2 | 6 | 0.7 | 1.25 | 1.4 | 25.1 | 1100 |
| 2 | 10 | 0.7 | 1.25 | 1.5 | 26.4 | 1200 |
| 2 | 16 | 0.7 | 1.25 | 1.5 | 28.3 | 1400 |
| 2 | 25 | 0.9 | 1.25 | 1.6 | 31.4 | 1800 |
| 2 | 35 | 0.9 | 1.6 | 1.7 | 34.1 | 2250 |
| 3 | 4 | 0.7 | 1.25 | 1.4 | 23.4 | 950 |
| 3 | 6 | 0.7 | 1.25 | 1.4 | 24.7 | 1100 |
| 3 | 10 | 0.7 | 1.25 | 1.5 | 25.2 | 1200 |
| 3 | 16 | 0.7 | 1.25 | 1.6 | 27.4 | 1500 |
| 3 | 25 | 0.9 | 1.6 | 1.7 | 31.7 | 2000 |
| 3 | 35 | 0.9 | 1.6 | 1.8 | 34 | 2500 |
| 3 | 50 | 1 | 1.6 | 1.8 | 32.7 | 2750 |
| 3 | 70 | 1.1 | 1.6 | 1.9 | 36.4 | 3500 |
| 3 | 95 | 1.1 | 2 | 2.1 | 41 | 4750 |
| 3 | 120 | 1.2 | 2 | 2.2 | 44.5 | 5500 |
| 3 | 150 | 1.4 | 2.5 | 2.3 | 49.3 | 7000 |
| 3 | 185 | 1.6 | 2.5 | 2.4 | 53.4 | 8250 |
| 3 | 240 | 1.7 | 2.5 | 2.6 | 58.7 | 10500 |
| 3 | 300 | 1.8 | 2.5 | 2.7 | 63.7 | 12500 |
| 3 | 400 | 2 | 2.5 | 2.9 | 71.1 | 15500 |
| 4 | 4 | 0.7 | 1.25 | 1.4 | 24.7 | 1100 |
| 4 | 6 | 0.7 | 1.25 | 1.5 | 26.2 | 1200 |
| 4 | 10 | 0.7 | 1.25 | 1.5 | 27.8 | 1500 |
| 4 | 16 | 0.7 | 1.25 | 1.6 | 29.3 | 1700 |
| 4 | 25 | 0.9 | 1.6 | 1.7 | 34 | 2500 |
| 4 | 35 | 0.9 | 1.6 | 1.8 | 35.2 | 3000 |
| 4 | 50 | 1 | 1.6 | 1.9 | 36.6 | 3250 |
| 4 | 70 | 1.1 | 2 | 2.1 | 40.3 | 4500 |
| 4 | 95 | 1.1 | 2 | 2.2 | 44.6 | 5750 |
| 4 | 120 | 1.2 | 2.5 | 2.3 | 49.5 | 7250 |
| 4 | 150 | 1.4 | 2.5 | 2.4 | 54 | 8500 |
| 4 | 185 | 1.6 | 2.5 | 2.6 | 58.8 | 10500 |
| 4 | 240 | 1.7 | 2.5 | 2.7 | 64.8 | 13000 |
| 4 | 300 | 1.8 | 2.5 | 2.9 | 71.7 | 16000 |
| 4 | 400 | 2 | 3.15 | 3.2 | 82.5 | 21000 |
| 5 | 4 | 0.7 | 1.25 | 1.4 | 26.3 | 1200 |
| 5 | 6 | 0.7 | 1.25 | 1.5 | 27.9 | 1400 |
| 5 | 10 | 0.7 | 1.25 | 1.5 | 29.7 | 1700 |
| 5 | 16 | 0.7 | 1.25 | 1.6 | 32.2 | 2250 |
Standards
Design Standards: BS 7629-1, EN 60228
Fire Resistance & Circuit Integrity: BS 8434-2, EN 50200 (PH30, PH60, PH90, PH120), BS 6387 Category CWZ, BS 8519 Category 3
System Application Codes: BS 5839-1 (Fire detection and alarm systems), BS 5266-1 (Emergency lighting systems)
Zero Halogen & Smoke Emission: IEC/EN 60754-1/2, IEC/EN 61034-2
Operating Temperature Range: -40°C to +90°C
Minimum Bending Radius: 6 × overall diameter
Regulatory Compliance & Certifications: BASEC Approved, LPCB Certified (Red Book Live), CE Marked, UKCA Marked, RoHS 2015/65/EU, REACH EC 1907/2006
Frequently Asked Questions
Q: What is the primary difference between ‘Standard’ and ‘Enhanced’ grade fire-resistant cables?
A: Standard grade cables meet basic fire survival criteria (typically 30–60 minutes under EN 50200 PH30/PH60), whereas Enhanced grade cables withstand 120 minutes of direct fire with mechanical impact and water spray testing under BS 8434-2 and BS 8519 Category 3, designed for complex phased evacuations.
Q: Why does the cable combine Mica/Glass tape with silicone rubber insulation?
A: The composite insulation utilizes fire-resistant silicone rubber for continuous 90°C electrical insulation during normal service, while the inorganic Mica/Glass tape forms a solid dielectric barrier that prevents conductor shorting even if the rubber ceramifies under direct flame.
Q: What is the function of the uninsulated tinned copper drain wire?
A: The drain wire maintains continuous physical contact with the Al/PET metallic foil screen throughout the cable length, providing a low-impedance path to earth for electrostatic discharge and enabling quick earth-fault disconnection.
Q: What payment terms does Huadong Cable accept for international project procurement?
A: We accept standard international commercial payment terms, including Telegraphic Transfer (T/T, with 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.
BS 7629-1 Enhanced Fire Resistant Cable Why Choose Huadong?
Huadong Cable Group manufactures BS 7629-1 Enhanced Fire Resistant Cables to stringent British and European safety criteria, verified through continuous testing for conductor resistance, insulation dielectric strength, BS 8434-2 fire-shock-water survival, and zero-halogen gas emissions. Utilizing high-conductivity Class 1 solid and Class 2 stranded plain copper conductors, our automated extrusion lines apply precision dual-layer Mica/Glass tape and high-grade silicone rubber compounds. Combined with overall Al/PET foil screening and an LSZH jacket, our cables deliver reliable circuit integrity during building fires.
With more than 20 years of precision cable engineering expertise, Huadong Cable Group operates automated taping, silicone extrusion, and zero-halogen compounding workshops certified to ISO 9001, BASEC, LPCB, CE, and UKCA standards. By eliminating intermediary markups, we deliver competitive direct factory pricing, 100% routine Mill Test Certificates (MTC) tested in accredited testing facilities, continuous drum lengths on ISPM 15 heat-treated export wooden reels, and seamless door-to-port logistics for EPC contractors and life-safety installers worldwide.
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