Fire-Resistant XLPE Insulated Single Core Power Cable 0.6/1kV IEC 60331 for Emergency Safety Circuits

Fire-Resistant XLPE Insulated Single Core Power Cable 0.6/1kV | IEC 60331 | YJV / N2XY

Fire-resistant XLPE insulated power cables are critical infrastructure components deployed in emergency power systems, fire suppression circuits, evacuation lighting networks, and safety instrumentation across industrial, commercial, and public-sector facilities. This single core fire-resistant XLPE cable is manufactured to IEC 60331-21 fire survival standards, featuring copper conductor, double-layer mica tape fire barrier, XLPE insulation, and flame-retardant PVC outer sheath — the YJV/N2XY construction enhanced with a mineral fire barrier that maintains circuit integrity for 3 hours under 750°C flame exposure while energized at rated voltage.

Unlike conventional power cables that fail within minutes of flame exposure, fire-resistant XLPE cables are engineered as a safety system component. When the outer PVC sheath and XLPE insulation burn away under fire conditions, the overlapping mica tape layer — a natural mineral stable to 1000°C — remains intact as a continuous dielectric barrier around the copper conductor. This enables uninterrupted power transmission to fire pumps, smoke extraction fans, emergency lighting, and alarm systems when building evacuation is in progress. Compliance with IEC 60502 for general construction and IEC 60331 for fire survival makes this fire-resistant cable suitable for EPC projects worldwide requiring certified life-safety electrical infrastructure.

Cable Construction (Inside to Outside)

1. Conductor: Plain annealed copper (CU), Class 1 solid or Class 2 stranded per IEC 60228. Single core configuration for maximum current capacity and simplified phase segregation in multi-cable fire-rated circuits.
2. Fire Barrier: Double-layer overlapping mica tape applied directly over the conductor with minimum 30% overlap. Mica is a phyllosilicate mineral with continuous service capability above 1000°C, providing the primary dielectric barrier during fire conditions.
3. Insulation: Cross-linked polyethylene (XLPE), providing standard electrical insulation under normal operating conditions with 90°C continuous and 250°C short-circuit ratings per IEC 60502-1.
4. Outer Sheath: Flame-retardant PVC (polyvinyl chloride), black or red per project specification. Formulated to IEC 60332-1-2 for self-extinguishing vertical flame performance. Red sheath option provides instant visual identification of fire-rated circuits in cable trays and risers.

Application Scenarios by Industry

Technical Specifications

Common Single Core Sizes & Current Carrying Capacity (Fire-Resistant YJV / N2XY)

Ampacity reference conditions: 30°C ambient air, 20°C ground temperature, single cable in free air or trefoil formation in ground. For precise ampacity calculations including grouping, ambient correction, and installation method de-rating factors, contact our engineering team with your project parameters.

Engineering Advantages

Purpose-engineered for life-safety electrical circuits where power continuity during fire conditions is non-negotiable:

• Certified Fire Survival: IEC 60331-21 tested and verified — maintains circuit integrity for a minimum of 3 hours under 750°C flame exposure while energized at rated voltage. Provides the critical time window for safe building evacuation and fire suppression system operation.
• Double-Layer Mica Barrier: Overlapping mica tape winding with minimum 30% overlap creates a redundant fire barrier. Even if flame penetrates one layer, the second maintains dielectric integrity. Mica's natural mineral structure withstands temperatures exceeding 1000°C without decomposition.
• Flame-Retardant Sheath Options: Standard PVC sheath passes IEC 60332-1-2 vertical flame test. LSZH (Low Smoke Zero Halogen) option available for enclosed public spaces, tunnels, and metro stations where smoke toxicity and visibility during evacuation are critical safety factors.
• EPC Project Ready: Supplied with full material certification, fire survival test reports, and third-party inspection documentation (SGS, Bureau Veritas, Intertek). Meets documentation requirements for international EPC contractors and consultant engineer approval processes.
• Single Core Flexibility: Single core design allows phase-by-phase segregation in cable management systems, simplifies termination in switchgear and motor control centers, and enables trefoil formation for optimized magnetic field balance in high-current circuits.

Standards and Certifications

Third-party FAT (Factory Acceptance Testing) and inspection available through SGS, Bureau Veritas, and Intertek. Testing reports, material certificates, and fire survival test documentation provided with each order for project compliance verification and consultant engineer approval.

FAQ

Q: What is IEC 60331 fire survival testing and how does it differ from flame retardant tests?
A: IEC 60331-21 tests the cable's ability to maintain circuit integrity — continue conducting electricity — while being exposed to 750°C flame for a minimum of 3 hours. This is fundamentally different from flame retardant tests (IEC 60332) which only verify the cable does not propagate flame along its length. Fire-resistant cables are safety system components; flame-retardant cables are general installation cables. For emergency circuits, only IEC 60331 certified cables are acceptable.

Q: How does the mica tape fire barrier actually work?
A: Mica is a natural mineral that remains physically and electrically stable above 1000°C. The overlapping mica tape is applied directly over the copper conductor. During a fire, the PVC sheath and XLPE insulation burn away, but the mica tape remains intact as a continuous insulating wrapper around the conductor, enabling the cable to continue transmitting power throughout the fire event.

Q: What installation methods are suitable for fire-resistant cables?
A: Fire-resistant single core cables are installed in cable trays, conduits, trunking, or on dedicated cable ladder systems. Critical requirement: the entire cable support system must have fire resistance equal to or greater than the cable itself. Cable fixings, ties, and supports must be metallic — plastic fixings fail at fire temperatures and cause cable sagging. We provide installation guidance documentation with every order.

Q: Is this single core cable compatible with armored constructions?
A: Yes, steel wire armored (SWA) versions designated YJV32 are available for applications requiring mechanical protection in addition to fire resistance. Contact us with your project specification to determine whether armored fire-resistant cable is required for your installation conditions.

Q: What is the expected service life of fire-resistant XLPE cable?
A: Under normal operating conditions (90°C maximum conductor temperature, proper installation), fire-resistant XLPE cables have a design life exceeding 30 years for the XLPE insulation system. The mica tape fire barrier is an inert mineral material unaffected by normal aging mechanisms — its fire protection properties remain unchanged throughout the cable's operational life.

Q: How to select the correct fire-resistant cable size for an emergency circuit?
A: Cable sizing for emergency circuits follows the same principles as standard power cables (load current, voltage drop, short-circuit rating) plus additional fire condition de-rating. We provide free engineering support — send us your emergency system load schedule, cable route length, and installation method, and our team will provide a complete sizing calculation with fire condition verification.

Documentation and Downloads

The following technical documentation is available upon request for project specification and approval processes:

• Product Datasheet: Comprehensive technical specification sheet with dimensional data, electrical characteristics, and performance curves for all standard conductor sizes.
• Fire Survival Test Report: IEC 60331-21 third-party test certification with complete test parameters, flame temperature profiles, and circuit integrity duration verification.
• Installation Guide: Detailed installation recommendations covering minimum bending radius, pulling tension limits, cable support spacing, and fire-rated fixing requirements for compliance with life-safety installation standards.
• Material Certification: Mill test certificates for copper conductor, XLPE compound batch certification, mica tape technical data sheet, and PVC sheath compound compliance statements.
• Technical Drawing: Dimensioned cross-section drawing showing conductor, mica tape layers, XLPE insulation, and outer sheath with tolerances.

All documentation is provided in PDF format with proper document control references. Contact our technical sales team to request documentation for your project.