6491B H07Z-R Low Smoke Cable 450/750V BS7211

The designation “6491B” comes from British Standards, while “H07Z-R” is the harmonised European code. It is manufactured to BS EN 50525-3-41 (replacing BS 7211).

H07Z-R Code Breakdown:

• H – Harmonised cable (built to an EU standard)
• 07 – Voltage rating of 450/750V (U0/U)
• Z – Insulation material is zero-halogen, thermosetting (LSZH)
• R – Rigid stranded conductor (Class 2 stranding)

Key fire performance standards are met (IEC 60332-1-2) to ensure 6491B cables will not propagate fire easily, and will not release dense smoke or corrosive fumes.
Always check our stock for BASEC approved 6491B cables.

• Conductor: Uses a plain annealed copper conductor (Class 2 stranding per BS EN 60228). Standard sizes range from small cross-sections like 1.5mm² up to large 630mm² conductors.
• Insulation: Single layer of Low Smoke Zero Halogen thermosetting polymer (Type EI5), allowing operation up to 90°C without melting.
• Identification: Available in common insulation colours including brown, black, grey, blue, red, white, orange, violet, and green/yellow bicolour for earthing.
• Physical Form: A non-sheathed single core—meaning it has no additional outer jacket and must be installed inside conduit or trunking.

• Voltage Rating: Rated 450/750 V, suitable for typical low voltage mains distribution.
• Thermal Ratings: Continuous operating temperature up to 90°C (a key advantage over 6491X’s 70°C). Minimum operating temp is -15°C.
• Current-Carrying Capacity: High capacity; e.g., 2.5mm² is rated for about 30A in conduit.
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• Mechanical Bending Radius: Minimum bend radius is typically 3× the outer diameter for smaller sizes, requiring careful installation.
• Safety: Halogen-free and lead-free, ensuring environmental compliance.

Typical Applications:

• Conduit Wiring Systems
• Trunking and Ducting
• Distribution Boards & Switchgear
• Lighting Circuits
• Industrial and Plant Wiring
• Airports, Underground & Transportation
• Earthing and Bonding

Key LSZH Advantages:

• Minimal Smoke Emission: Greatly improves visibility for escape routes.
• Zero Halogen & Low Toxicity: Reduces health risks by emitting no corrosive fumes (like hydrochloric acid).
• Compliance with Safety Standards: Ensures installations meet strict fire safety codes.