Standard Fire Resistant Cable BS 7629-1

What is Standard Fire Resistant Cable BS 7629-1?

The Standard Fire Resistant Cable BS 7629-1 is a 300/500V screened, low-smoke zero-halogen fire performance cable manufactured in accordance with British standards BS 7629-1 and BS 5839-1. It is specifically engineered to preserve circuit integrity in general building environments where active life-safety and emergency alarm networks must remain operational during a fire incident.

Meeting the criteria of BS EN 50200 for classifications PH30 through PH120, the cable maintains electrical continuity under simultaneous flame and mechanical shock conditions. Its core design features high-performance fire-resistant silicone rubber insulation that ceramifies into an insulating barrier under direct flame, complemented by an overall aluminium/polyester tape screen and an LSZH sheath that suppresses smoke generation and prevents the emission of toxic halogen acid gases per IEC/EN 60754-1/2 and IEC/EN 61034-1/2.

Standard Fire Resistant Cable BS 7629-1 Cable Construction

• Conductor: Plain annealed copper conductor; Class 1 solid copper for sizes 1.5mm² and 2.5mm², and Class 2 stranded copper for 4mm² and over per BS EN 60228.
• Insulation: High-performance fire-resistant silicone rubber compound providing primary dielectric and thermal endurance.
• Overall Screen: Aluminium/Polyester (Al/PET) tape screen providing 100% electrostatic shielding coverage.
• Circuit Protective Conductor: Continuous tinned copper drain wire in contact with the metallic screen for fast termination and low-resistance earthing.
• Outer Sheath: Thermoplastic Low Smoke Zero Halogen (LSZH) protective compound.
• Core Identification: 2 cores: Blue, Brown + Bare Earth; 3 cores: brown, Black, Grey + Bare Earth; 4 cores: Blue, Brown, Black, Grey.
• Sheath Colour: Red or White.

Applications

Standard BS 7629-1 fire-resistant cables are deployed across building automation and emergency infrastructure requiring proven circuit survivability during general evacuations:

• Fire Alarm & Detection Networks: Interconnecting circuits linking manual call points, heat and smoke detectors, and control panels compliant with BS 5839-1.
• Voice Alarm Systems (VA/PA): Emergency broadcast and voice evacuation speaker circuits providing critical evacuation notifications.
• Emergency Lighting Installations: Centralized feeds for illuminated escape signage, directional markers, and emergency luminaires per BS 5266-1.
• Commercial & Residential Buildings: Educational campuses, retail complexes, apartment buildings, and public spaces requiring compliance with British life safety standards.

Specifications & Dimensions

Huadong Cable Group manufactures Standard BS 7629-1 fire-resistant cables across 2-core, 3-core, and 4-core configurations with nominal conductor sizes of 1.5mm², 2.5mm², and 4mm² (with electrical performance specifications supporting 1mm² systems). Operating at a rated voltage of 300/500V across an operating temperature range of -40°C to +90°C, the series features nominal overall outer diameter ranging from 8.0mm (2 × 1.5mm²) up to 13.5mm (4 × 4mm²) and nominal unit weights from 95 kg/km to 330 kg/km. Conductor DC resistance values at 20°C strictly conform to BS EN 60228 (12.1 Ω/km for 1.5mm², 7.41 Ω/km for 2.5mm², and 4.61 Ω/km for 4mm²) with insulation resistance exceeding 300 MΩ·km, delivering clipped-direct current ratings up to 45A and conduit/tray ratings up to 40A under an installation bending radius of 6 times the overall cable diameter in full alignment with BS 7629-1 and BS 5839-1 standards.

Standards

Design & Performance Standards: BS 7629-1, BS 5839-1, BS 5266-1, BS 6387, BS 8519, BS EN 60228[br]
Fire Resistance Testing: BS EN 50200 (Classifications PH30, PH60, PH90, PH120)
Halogen-Free & Low Smoke: IEC/EN 60754-1/2 (Zero halogen acid gases), IEC/EN 61034-1/2 (Low optical smoke density)
Third-Party Approvals: BASEC Approved (British Approvals Service for Cables), LPCB Certified (Loss Prevention Certification Board, Red Book Live listed)
Operating Rating: Voltage Rating Uo/U: 300/500V; Temperature: -40°C to +90°C; Minimum Bending Radius: 6 × OD
Regulatory Directives: Low Voltage Directive 2014/35/EU, RoHS Directive 2015/65/EU, REACH EC 1907/2006, CE Marked, UKCA Marked

Frequently Asked Questions

Q: What is the main structural difference between Standard and Enhanced fire-resistant cables under BS 7629-1?
A: Standard cable use high-performance fire-resistant silicone rubber insulation for basic single-phase evacuation (BS EN 50200 PH120), whereas Enhanced grade cables incorporate a composite insulation system combining mica/glass tape with silicone rubber and are tested under BS 8434-2 for prolonged multi-phase evacuation.

Q: What role does the Aluminium/Polyester (Al/PET) tape screen play in fire alarm applications?
A: The Al/PET screen provides electrostatic shielding against external electromagnetic interference (EMI), ensuring clean signal transmission across sensitive addressable fire alarm and emergency communications circuits.

Q: Can Standard BS 7629-1 fire-resistant cable be installed outdoors without conduit?
A: The cable is suitable for internal fixed wiring and external clipped runs where mechanically protected; however, where exposed to harsh sunlight, direct mechanical damage, or standing water, installation in UV-resistant conduit or selection of armoured cable variants is recommended.

Q: What commercial payment terms does Huadong Cable accept for international orders?
A: We accept standard international commercial payment terms, primarily Telegraphic Transfer (T/T, 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

BS 7629-1 Standard Fire Resistant Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures Standard BS 7629-1 fire-resistant cables in strict compliance with British fire performance standards, verified through rigorous testing under BS EN 50200 PH120. Utilizing 99.99% high-purity electrolytic copper conductors, our extrusion facilities apply uniform layers of high-grade fire-resistant silicone rubber, followed by continuous Al/PET screening and zero-halogen outer compounding to maintain electrical concentricity, flexibility, and non-toxic combustion properties.

With more than 20 years of precision cable manufacturing experience, Huadong Cable Group operates facilities certified to ISO 9001, CE, and UKCA standards. Supplying directly from our manufacturing base eliminates intermediary distribution markups, allowing us to offer competitive factory-direct pricing, 100% routine Mill Test Certificates (MTC) tested in accredited testing facilities, continuous drum lengths on ISPM 15 heat-treated export wooden reels, and dependable logistics for international contractors and electrical distributors worldwide.