PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH Cable

What is PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH Cable?

The PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH cable is a low-voltage, unarmoured, fire-resistant, and collectively screened multi-element communication and instrumentation cable featuring plain copper conductors, ceramifying silicone rubber insulation, a collective Aluminium/Polyester tape (Al/PET) electrostatic screen with a tinned copper drain wire, and a low smoke zero halogen (LSZH) outer jacket complying with BS/PAS 5308 and EN 60228 standards. It is designed for fixed indoor transmission of analogue, data, or voice signals up to 300/500V from critical transducers—such as pressure transmitters, proximity detectors, and emergency microphones—in petrochemical and industrial plants where uninterrupted circuit survival during active fires is mandatory.

Engineered for mission-critical emergency control networks, the cable utilizes advanced silicone rubber insulation that pyrolyzes into a stable ceramic insulative layer when exposed to severe flame temperatures, preventing phase-to-phase and phase-to-ground short circuits without requiring bulky tape wrappings. The collective Al/PET foil screen envelops the assembled core bundle to provide 100% electrostatic shielding against high-frequency electromagnetic noise, while the zero-halogen jacket eliminates dense smoke emissions and toxic acid gas propagation to safeguard personnel evacuation corridors and sensitive digital control hardware.

PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH Cable Construction

• Conductor: 0.5mm² and 0.75mm²: Class 5 flexible plain copper; 1.0mm²: Class 1 solid / Class 2 stranded plain copper; 1.5mm² and 2.5mm²: Class 2 stranded plain annealed copper conforming to EN 60228.
• Insulation: Silicone rubber ceramic type compound engineered to form an insulative ceramic ash structure during direct flame impingement.
• Bedding / Inner Layer: Concentric multi-pair, multi-triple, or quad bunched core assembly optimized for compact outer diameters and smooth installation pulling.
• Screen / Armour: Overall collective Aluminium/Polyester tape (Al/PET) screen with a continuous tinned copper drain wire delivering 100% electrostatic coverage against external EMI.
• Outer Sheath: Thermoplastic Low Smoke Zero Halogen (LSZH) compound, flame retardant per IEC/EN 60332-1-2 and bunched fire test IEC/EN 60332-3-24.
• Core Identification: Pairs, Triples, and Quads identifiable via standardized British industrial colour codes and numerical markings.
• Sheath Colour: Red (for fire alarms and emergency circuits) or Black (for general industrial instrumentation).

Applications

PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH cables are specifically engineered for transmitting critical voice, data, and analogue telemetry signals from transducers—such as pressure sensors, proximity switches, and microphones—in environments where circuit survival during a fire is paramount. Their unarmoured, lightweight profile makes them ideal for indoor installations, cable trays, raceways, and enclosed architectural risers where external mechanical crush hazards are absent.

Typical installation environments include:

• Petrochemical Units & Refineries: Critical emergency shutdown systems (ESD), combustible gas detection loops, and supervisory instrumentation.
• Fire Alarm & Public Address Systems: Connecting voice alarms, smoke damper controls, and emergency speech communication networks in commercial and public infrastructure.
• Process Control Rooms & Plant Marshaling: Multi-pair analog and digital transducer links requiring total electrostatic noise protection.
• Enclosed Public Transport & Tunnels: Indoor and underground duct runs requiring zero halogen acid emission and circuit continuity during fire emergencies.

Specifications & Dimensions

The PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH cable series covers 1 pair (1P) to 20 pairs (20P), 1 triple (1T), and 2-pair quad [2P(Q)] configurations across nominal conductor cross-sections of 0.5mm², 0.75mm², 1.0mm², 1.5mm², and 2.5mm². Operating at a rated voltage of 300/500V, the cable supports fixed installations from -40°C to +80°C and flexed moved installation from 0°C to +50°C, maintaining a compact minimum bending radius of 6× overall diameter. Conductor DC resistance values at 20°C range from 39 Ω/km (0.5mm²) down to 7.41 Ω/km (2.5mm²), with mutual capacitance of 75 pF/m to 120 pF/m depending on core geometry and screening layout, minimum insulation resistance exceeding 5 GΩ/km, and maximum L/R ratios between 25 µH/Ω and 65 µH/Ω, with all outer dimensions manufactured in strict compliance with BS/PAS 5308 and European harmonized tolerances.

Standards

Huadong Cable Group manufactures and factory-inspects PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH fire resistant cables in full compliance with British and European electrical and life-safety standards:

Design & Testing Standards: BS/PAS 5308, EN 60228
Fire Resistance & Flame Retardancy: Ceramifying silicone rubber fire barrier; Flame Retardant according to IEC/EN 60332-1-2 and IEC/EN 60332-3-24
Smoke & Halogen Directives: Low Smoke Zero Halogen (LSZH) emissions protecting personnel and sensitive electronic hardware
Voltage Rating (Uo/U): 300/500V
Temperature Spectrum: Fixed: -40°C to +80°C; Flexed/Installation: 0°C to +50°C
Regulatory Compliance: CE Marked, European Regulation EN 50575 (CPR Compliant), Low Voltage Directive 2014/35/EU, RoHS Directive 2015/65/EU, REACH EC 1907/2006

Frequently Asked Questions

Q: How does ceramic-type silicone rubber insulation provide fire resistance compared to MICA tape constructions?
A: Ceramifying silicone rubber insulates conductors during normal operation and converts directly into a rigid ceramic silica shell upon exposure to fire temperatures, maintaining electrical isolation without the added stiffness or winding labor of external MICA tapes.

Q: Can PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH cables be installed outdoors or directly underground?
A: No, Part 1 Type 1 cables are unarmoured and engineered specifically for indoor installations or protected raceways where mechanical crush hazards are absent; for direct underground burial, steel wire armoured (Part 1 Type 2) cables must be specified.

Q: Why are these fire-resistant cables supplied in Red and Black outer sheaths?
A: Red is standard for life-safety emergency equipment, fire alarms, and smoke control systems, while black is used for general industrial process control and plant instrumentation loops.

Q: What payment terms does Huadong Cable accept for international project supply orders?
A: We accept standard international commercial payment terms including Telegraphic Transfer (T/T) and 100% Irrevocable Letter of Credit (L/C) at sight for engineering contractors, system integrators, and plant infrastructure builders.

PAS BS 5308 Part 1 Type 1 – Why Choose Huadong Cable?

Huadong Cable Group manufactures PAS BS 5308 Part 1 Type 1 SIL/CAM/LSZH fire-resistant instrumentation cables to the highest international quality criteria, verified through rigorous IEC/EN 60332-1-2 and IEC/EN 60332-3-24 flame propagation tests. Utilizing high-conductivity Class 5 flexible or Class 2 stranded plain annealed copper conductors, our automated extrusion lines apply precision ceramifying silicone rubber insulation to deliver superior dielectric strength, low mutual capacitance, and insulation resistances exceeding 5 GΩ/km. Combined with a continuous collective Al/PET screening foil, tinned copper drain wire, and a zero-halogen flame-retardant outer sheath, our cables guarantee mission-critical communication continuity and life safety in hazardous processing facilities.

With more than 20 years of precision cable engineering expertise, Huadong Cable Group operates advanced multi-pair bunching, planetary cabling, electrostatic shielding, and polymer extrusion workshops certified to ISO 9001, CE, CPR (EN 50575), RoHS, and REACH protocols. By supplying directly from our manufacturing base, we offer competitive factory pricing, 100% routine and type test Mill Test Certificates (MTC) tested in accredited testing facilities, customized continuous drum lengths packaged on ISPM 15 heat-treated export wooden reels, and seamless door-to-port logistics for EPC contractors and industrial instrumentation builders worldwide.