BS 7835 XLPE LSZH 12.7/22kV Medium Voltage Power Cable Underground & Ducting, Single/Three Core, Flame Retardant, UV Resistant, Copper Conductor

Application

Medium voltage LSZH power cables for power networks, underground and in cable ducting.

Voltage Rating

Uo/U (Um): 12.7/22 (24) kV

Temperature Rating

Fixed: 0°C to +90°C

Minimum Bending Radius

Single core - Fixed: 15 × overall diameter
3 core - Fixed: 12 × overall diameter
(Single core 12 × overall diameter and 3 core 10 × overall diameter where bends are positioned adjacent to a joint or termination, carefully controlled by use of a former)

Standards

BS 7835, IEC/EN 60228
Flame Retardant: IEC/EN 60332-1-2
UV Resistant

DIMENSIONS

ELECTRICAL CHARACTERISTICS

Medium voltage power distribution is a critical component of modern infrastructure, especially for industrial plants, commercial buildings, and underground networks. One of the most reliable solutions for these applications is the BS 7835 XLPE LSZH 12.7/22kV cable, designed to ensure safety, efficiency, and durability.

Where Are BS 7835 Cables Commonly Used?

BS 7835 cables are versatile and suitable for a range of applications:

Underground power networks: Ideal for urban electricity distribution, minimizing risk of fire and toxic smoke.
Industrial plants: For heavy machinery, transformers, and control equipment in factories.
Ducting systems: Efficient for cable trays and conduits in commercial complexes.
Renewable energy projects: Solar and wind farms where medium voltage distribution is required.

Case Study: Indonesia
In Jakarta’s industrial zones, BS 7835 XLPE LSZH 12.7/22kV cables have been deployed in underground ducts powering manufacturing plants. The LSZH sheath prevented hazardous smoke emission during a minor fire, and the cable’s flexibility allowed installation in narrow ducts with complex bends.

What Are the Benefits of Flame Retardant and UV-Resistant Properties?

Safety is a top priority in power distribution. BS 7835’s LSZH sheath provides:

Flame Retardancy: Slows down fire propagation; compliant with IEC/EN 60332-1-2.
Low Smoke Emission: Reduces inhalation risks during fire incidents.
Zero Halogen: Prevents release of corrosive gases.
UV Resistance: Suitable for outdoor ducting exposed to sunlight.

These properties increase workplace safety and minimize environmental hazards, especially in densely populated or industrial areas.

What Are the Installation Recommendations for BS 7835 XLPE LSZH Cables?

Proper installation is crucial for maximizing cable lifespan and performance:

Bending Radius: Follow recommended minimums: Single core: 15× diameter, Three core: 12× diameter; reduce near joints with care.
Underground Ducting: Ensure well-drained soil to prevent water ingress.
Separation from Heat Sources: Maintain at least 10 cm distance from high-temperature equipment.
Mechanical Protection: Use appropriate armour depending on single or multi-core design.
Termination and Jointing: Use certified medium voltage terminations; adhere to torque specifications.

FAQ: Frequently Asked Questions About BS 7835 XLPE LSZH Cables

1. Can BS 7835 cables be used in high-humidity areas?

Yes, LSZH insulation combined with XLPE conductor screens ensures excellent moisture resistance, making the cable suitable for tropical climates such as Indonesia.

2. How do single-core and three-core BS 7835 cables differ?

Single-core: Aluminium wire armour (AWA), better for direct burial with minimal electromagnetic interference.
Three-core: Steel wire armour (SWA), designed for higher mechanical protection and industrial settings.

3. What is the expected lifespan of BS 7835 cables?

Under proper installation, BS 7835 cables can last 25–30 years, provided environmental conditions and mechanical stresses are within design limits.

4. How does BS 7835 perform under short-circuit conditions?

The copper conductor and XLPE insulation can withstand short-term thermal stresses without degradation, and the armoured construction protects against mechanical damage.

5. Is BS 7835 suitable for renewable energy installations?

Yes, its medium voltage rating and flame retardancy make it ideal for solar farms, wind turbines, and hybrid energy projects requiring underground cable networks.

Installation Checklist for Engineers

Confirm cable size matches load and voltage requirements.
Check minimum bending radius near joints and terminations.
Verify ducting is clean, free from sharp edges, and well-drained.
Use compatible medium voltage terminations and accessories.
Conduct insulation resistance tests before commissioning.
Label all installed cables for maintenance and safety compliance.

Why Choose BS 7835 XLPE LSZH 12.7/22kV Cables?

Enhanced Safety: Low smoke, halogen-free, flame-retardant.
High Performance: Suitable for 12.7/22kV networks with low conductor losses.
Durable: UV resistant and mechanically strong with SWA/ AWA armour.
Versatile: Single-core and three-core designs accommodate diverse installations.
Global Standard Compliance: BS 7835, IEC/EN 60228, IEC/EN 60332.

Where to Buy and Install

To ensure safety and compliance, purchase BS 7835 XLPE LSZH cables from certified suppliers and hire trained technicians for installation. Properly installed BS 7835 cables will minimize downtime, reduce fire hazards, and provide reliable power distribution for decades.