Single Core Electrical Cable: 6491X, 6491B & Panel Wiring
Your essential guide to the single-core cable range, including the standard PVC (6491X) and the fire-safety LSZH (6491B) options.
Single core cables are fundamental to all electrical installations, used extensively for panel wiring, earthing, conduit runs, and internal building circuits. The choice between PVC, XLPE, and LSZH insulation dictates the thermal and fire-safety performance of the system. We supply a complete range of BASEC-approved single core cables up to 630mm²—contact us for immediate stock and competitive trade prices.
Understanding Single Core Cable Construction
A single core cable consists of one conductor and its layer of insulation, without a protective sheath. Its physical construction is defined by the flexibility of the copper conductor.
Conductor Classes: Solid vs. Stranded (Fixed Wiring)
For general building and panel wiring, single core cables typically use rigid conductors for stability in fixed installations:
- Class 1 (Solid): A single, rigid rod. Used primarily for small cross-sections (e.g., 1.5mm²).
- Class 2 (Stranded): Multiple wires twisted together. Offers greater pliability for ease of installation through conduit and trunking, making it the most common type for wiring circuits.
- Class 5 (Flexible): Highly pliable conductors used in temporary or flexible cables like H07RN-F, not typically designated as fixed single-core wire.
Insulation Materials: PVC vs. LSZH (6491X vs. 6491B)
The insulation material defines the cable's thermal performance and critical safety characteristics:
| Feature | 6491X (PVC) | 6491B (LSZH) |
|---|---|---|
| Insulation Type | PVC (Thermoplastic) | LSZH (Thermosetting) |
| Max Temp | 70°C | 90°C |
| Fire Safety | Dense smoke, toxic gas | Low smoke, zero halogen (Critical for evacuation) |
Key Products, Applications, and Sizing
6491X H07V-R Cable (PVC)
The standard single-core wire used for general purpose power circuits and fixed installations. Its PVC insulation makes it cost-effective and suitable for most internal, low-risk environments.
6491B H07Z-R Cable (LSZH) – Safety Critical Installations
6491B is the LSZH equivalent of 6491X. Its superior fire performance makes it mandatory for use in:
- Public Spaces: Hospitals, schools, theatres, and enclosed areas.
- Infrastructure: Underground stations, tunnels, and railway applications.
- Panel Wiring: Control and switchgear panels where equipment protection is vital.
We supply BASEC-approved 6491B LSZH cable compliant with BS EN 50525-3-41 (formerly BS 7211).
Core Applications for Single Core Cable
The versatility of single-core cables means they are used for many functions, but always within protective conduit or trunking systems:
Detailed Applications and Sizing
- Panel Wiring: Used extensively in distribution boards, switchgear, and control gear for short, rigid runs.
- Earthing: Green/Yellow single-core cables are used as the main protective earth (PE) conductor throughout an installation.
- Conduit Runs: Installed in PVC or metallic conduit for power and lighting circuits (e.g., 1.5mm² or 2.5mm²).
- Sizes Available: Ranging from 1.5mm² up to 630mm² to accommodate everything from lighting to heavy industrial feeds.
Always observe the maximum fill capacity of the conduit or trunking to prevent thermal overheating, as multiple cables grouped together reduce their individual current-carrying capacity.
Technical Data & Purchase Information
Understanding the specifications ensures compliance. All standard single core cables are rated at 450/750V (Uo/U).
Current Carrying Capacity (Amps)
Current capacity relies heavily on installation conditions and temperature. (Figures below for 70°C PVC in conduit):
| Core Size (mm²) | In Conduit (A) | Clipped Direct (A) |
|---|---|---|
| 1.5 | 15 | 19 |
| 2.5 | 20 | 27 |
| 6.0 | 37 | 47 |
| 16.0 | 68 | 85 |
Note: 90°C cables (6491B) allow for higher current ratings, requiring detailed derating factors to be applied.
Why Choose Cable Services for Single Core Cable?
We offer immediate stock, expert compliance advice, and custom services:
- BASEC Certified Stock: Full range of 6491X and 6491B LSZH cables.
- Cut-to-Length Service: Custom cutting available for bulk runs to eliminate waste and save costs.
- Competitive Trade Prices: Contact our nearest branch for a bespoke quote, especially for large projects.
Compliance Assurance: We help ensure you correctly specify 6491B (LSZH) in public and critical areas over 6491X (PVC).
Need Single Core Cable Stock Now?
For the best trade prices, immediate stock checks, and rapid delivery quotes on any 6491X or 6491B cable, contact our specialists.
Cable Services supply a wide range of products from leading brands, click here to see a sample range of cables that we can offer:
Contact Us
For further details on our products and services please get in touch.
Tel: + 44 (0) 1978 340 450
Email: sales@cableservices.co.uk
Cable Cutting Service
We have invested in an automatic winding and measuring cable cutting machine at our Wrexham facility. This £90,000 investment reflects our commitment to offering an economically valuable and highly efficient service for our valued customers.
We are known for providing tailored solutions that meet the exact needs of our customers. We recognise the growing demand for a flexible service that eradicates waste and delivers cost efficiencies. The efficiency and precision of this new machine support the industry’s commitment to operational sustainability and allow us to pass on cost savings to our customers.
