6381B (BS 7211) LSZH Cable

What is 6381B Cable?

The 6381B cable is a single-core, flexible, double-insulated power cable manufactured in accordance with British Standard BS 7211 and international standard IEC 60502-1, featuring Class 5 flexible copper conductors, thermosetting XLPE core insulation, and a low smoke zero halogen (LSZH) outer protective sheath. It is rated at 450/750V for cross-sections up to 35mm² and 0.6/1kV for 50mm² and above.

Engineered primarily as a high-reliability DC power supply lead for telecom central office equipment, uninterrupted power supply (UPS) banks, and server facilities, the 6381B combines the thermal durability of cross-linked polyethylene with the life-safety benefits of halogen-free compounds. Its flexible stranding enables tight bending in crowded wiring enclosures without fatiguing the copper strands, while its zero-halogen formulation ensures that no acidic fumes are emitted during a fire to etch microcircuitry or obscure evacuation corridors.

6381B Cable Construction

• Conductor: Class 5 flexible plain annealed copper conductor conforming to EN 60228.
• Insulation: Cross-Linked Polyethylene (XLPE) thermoset insulation rated for continuous 90°C operation.
• Bedding / Inner Layer: Concentric single-core structure with direct chemical and mechanical bonding between the XLPE core and the outer jacket.
• Armour Layer: None (Unarmoured flexible construction engineered for raceways, cable ladders, and indoor equipment enclosures).
• Outer Sheath: Low Smoke Zero Halogen (LSZH) thermoplastic compound, flame retardant per IEC/EN 60332-1-2.
• Core Identification: Solid single-core colored extrusion matching phase, neutral, or DC polarity requirements.
• Sheath Colour: Blue, Grey, Green/Yellow, with additional custom colors available upon request.

Applications

The 6381B BS 7211 / IEC 60502-1 cable is specified for low-voltage power distribution in telecommunication networks, data processing plants, and commercial switchgear installations where high conductor flexibility and strict fire performance are required.

• DC Telecom Power Distribution: Central office battery distribution frames (BDFB), rectifiers, and cellular base transceiver stations (BTS).
• Data Centers & Server Facilities: High-amperage power links connecting uninterruptible power supply (UPS) battery strings to power distribution units (PDUs).
• Switchgear & Substation Cubicles: Internal jumper wiring, panel bus connections, and transformer auxiliary power where rigid busbars cannot be routed.
• Public Transit & Infrastructure: Control rooms, airport terminals, and rail transit stations requiring flame-retardant, zero-halogen power wiring to safeguard personnel.

Specifications & Dimensions

Huadong Cable Group supplies 6381B cables covering nominal conductor cross-sections from 1.5mm² up to 240mm² (with extended sizes up to 630mm² available), supporting high current capacities in direct-clipped, tray, and free-air spaced configurations. The table below lists standard physical dimensions and DC resistance values per our manufacturing schedule.

Standards

Design & Conductor Standards: BS 7211, IEC 60502-1, EN 60228
Flame Retardancy: IEC/EN 60332-1-2
Regulatory Directives: CE Marked, 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 Regulations: BS 7671 (18th Edition Table 4E1A), IEC 60364-5-52

Frequently Asked Questions

Q: Why is 6381B cable preferred over single-insulated panel wires (like H07Z-K) for telecom DC applications?
A: The 6381B cable features a double-insulated construction (XLPE insulation plus a protective LSZH outer sheath), offering enhanced mechanical abrasion resistance, electrical isolation, and impact protection when routed on open telecommunication ladder racks.

Q: What are the minimum bending radius requirements for 6381B cables?
A: For conductor sizes up to 50mm², the minimum bending radius is 3 times the overall cable diameter (3× OD); for sizes 70mm² and above, the minimum bending radius is 4 times the overall cable diameter (4× OD).

Q: What are the voltage ratings across different cross-sectional sizes of 6381B?
A: Cable sizes up to 35mm² carry a voltage rating of 450/750V, whereas conductor sizes of 50mm² and above are rated at 0.6/1kV.

Q: What commercial payment terms does Huadong Cable Group accept for international project shipments?
A: We accept standard international B2B commercial terms, primarily Telegraphic Transfer (T/T, with 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

6381B – Why Choose Huadong Cable?

Huadong Cable Group manufactures 6381B single-core flexible LSZH cables utilizing premium electrolytic copper cathode with a minimum purity of 99.99%, drawn into fine Class 5 flexible stranding per EN 60228. Our modern extrusion lines apply precision dual-layer XLPE insulation and flame-retardant LSZH sheaths, ensuring uniform concentricity, high dielectric stability, and exceptional thermal resistance up to 90°C continuous operation and 250°C short-circuit tolerance.

With more than 20 years of global cable supply experience, Huadong Cable Group provides direct manufacturer pricing, complete traceability, and type test Mill Test Certificates (MTC) for every consignment. All cables are packaged on robust ISPM 15 export wooden drums or compact spools to prevent transit deformation, backed by our dedicated technical support team and worldwide logistics network.