6491B / H07Z-R LSZH Cable

What is 6491B / H07Z-R Cable?

The 6491B cable (harmonised under European designation H07Z-R) is a single-core, low smoke zero halogen (LSZH) insulated wiring cable manufactured in accordance with EN 50525-3-41 and conductor standard EN 60228. Rated at 450/750V, it features Class 2 stranded plain annealed copper conductors insulated with an advanced 90°C-rated thermoplastic zero-halogen compound.

Designed primarily for fixed power and lighting circuits installed inside conduits, surface trunking, and embedded raceways, 6491B / H07Z-R is specified in environments where toxic smoke and acidic combustion gases would endanger personnel or destroy sensitive microelectronics. The rigid stranded copper construction delivers high tensile endurance during conduit pulling, while its flame-retardant LSZH insulation complies with IEC/EN 60332-1-2, ensuring total circuit integrity without releasing toxic halogens under fire conditions.

6491B / H07Z-R Cable Construction

• Conductor: Class 2 stranded plain annealed copper conductor conforming to EN 60228, providing robust structural rigidity and pull-in tensile strength.
• Insulation: Low Smoke Zero Halogen (LSZH) thermoplastic compound rated for continuous 90°C operating temperature.
• Bedding / Inner Sheath: Single-core direct extrusion without intermediate layers, optimized for maximum space savings inside electrical conduits.
• Armour Layer: Unarmoured design engineered specifically for enclosed conduits, metallic trunking, and protected raceways.
• Outer Sheath: Single-layer insulated construction acting as both dielectric insulation and protective skin.
• Core Identification: Full-colour extruded core identification.
• Sheath Colour: Blue, Yellow, Green/Yellow, Grey, Red, Black, Orange, White, Brown, Violet, and Pink.

Applications

6491B / H07Z-R cables are designed for fixed, protected electrical power and lighting distribution in commercial buildings, public transportation hubs, and heavy industrial facilities requiring stringent life-safety fire performance.

• Conduit & Trunking Systems: Drawn into surface-mounted metallic or rigid non-metallic conduits, trunking runs, and underfloor ducts.
• Public Infrastructure & Commercial Facilities: Power wiring across airports, railway passenger terminals, hospitals, schools, and government complexes.
• Switchgear & Motor Control Centers: Fixed wiring interconnections inside high-temperature panels and protected industrial equipment.
• Embedded Wall Channels: Installed inside conduits embedded in plaster, masonry, or thermally insulating building structures per BS 7671 regulations.

Specifications & Dimensions

Huadong Cable Group manufactures 6491B / H07Z-R cables covering nominal conductor cross-sections from 1.5mm² up to 630mm², supporting current ratings up to 1454A in free-air installations. The table below lists standard physical dimensions and DC resistance parameters per EN 50525-3-41; custom lengths and spool packaging options are readily supplied upon request.

Standards

Design & Conductor Standards: EN 50525-3-41, EN 60228
Flame Retardancy: IEC/EN 60332-1-2
Halogen-Free & Smoke Emission: IEC/EN 60754-1/2, IEC/EN 61034-1/2
Regulatory Directives: CE Marked, BASEC Approved, European Construction Products Regulation (EN 50575 CPR Compliant), Low Voltage Directive 2014/35/EU, RoHS Directive 2015/65/EU, REACH Directive EC 1907/2006
Installation Norms: BS 7671 (18th Edition Table 4E1A & 4E1B), IEC 60364-5-52

Frequently Asked Questions

Q: What is the mechanical difference between 6491B (H07Z-R) and 2491B (H07Z-K) cables?
A: The difference lies in conductor flexibility: 6491B (H07Z-R) utilizes Class 2 rigid stranded copper designed specifically for pulling through conduits and fixed raceways, whereas 2491B (H07Z-K) features Class 5 fine flexible copper for internal switchgear panel wiring.

Q: Can 6491B / H07Z-R cable be installed directly on cable trays without conduit?
A: While primarily designed for conduit and closed trunking, 6491B may be routed on perforated trays or clipped direct where mechanical protection is provided and local wiring regulations (such as BS 7671 Reference Method C/F) permit single-insulated conductors.

Q: What is the minimum bending radius for 6491B / H07Z-R cables?
A: The cable requires a minimum bending radius of 6 times the overall cable diameter (6× OD) for fixed installations.

Q: What is the standard production and delivery lead time for Huadong Cable Group export orders?
A: For standard sizes and project quantities, our typical factory production and dispatch lead time is 15 to 25 working days from order confirmation and drawing approval.

6491B / H07Z-R – Why Choose Huadong Cable?

Huadong Cable Group produces 6491B / H07Z-R single-core LSZH wiring cables using 99.99% high-purity electrolytic copper drawn into rigid Class 2 concentric strandings according to EN 60228. Our automated high-speed extrusion lines apply premium-grade 90°C thermoplastic LSZH insulation, ensuring tight wall concentricity, outstanding spark-test integrity, and total zero-halogen fire resistance per IEC/EN 60754-1/2 and IEC/EN 61034-1/2.

With more than 20 years of global cable supply experience, Huadong Cable Group provides direct manufacturer pricing, complete batch traceability, and Mill Test Certificates (MTC) for all shipments. All cables are packaged on robust ISPM 15 heat-treated export wooden reels or reinforced spools to avoid transit damage, supported by dedicated engineers and worldwide sea freight logistics.