6491X cable is a single-core, PVC insulated, low voltage cable designed for fixed wiring. It is widely used in conduits, trunking, switchgear, and control panels. Manufactured to British Standard BS6004, it offers a reliable and cost-effective solution for distributing electricity in residential, commercial, and industrial settings. Its flexibility and straightforward installation make it a trusted choice for contractors and electricians.
6491X Cable Specification
6491X is built with quality materials to ensure performance and safety:
Key Features
- Conductor: Plain annealed copper (Class 1 solid or Class 2 stranded)
- Insulation: PVC (Polyvinyl Chloride) to BS6004
- Voltage Rating: 450/750V
- Temperature Rating: -15°C to +70°C
- Core Colours: Green/Yellow, Blue, Brown, Black, Grey, Red, White, Orange, Violet, Pink, Turquoise
- Standards Compliance: BS6004, BASEC approved, CE marked
It is flame-retardant and best suited for dry indoor environments, typically installed in conduit or trunking for mechanical protection.
What is the Diameter of 16mm 6491X?
The 16mm² 6491X cable has an approximate overall diameter of 7.4mm. This should not be confused with the conductor’s cross-sectional area of 16mm², which refers to the copper core rather than the physical width of the cable. The diameter is an important consideration for conduit sizing, ensuring compliance with wiring regulations and safe installation.
What Amps Can 16mm 6491X Cable Carry?
The current-carrying capacity of 16mm 6491X depends on how it is installed.
Current Ratings
- Clipped Direct: around 94A
- In Conduit/Trunking: around 85A
Figures are based on the IET Wiring Regulations (BS 7671). Ambient temperature, grouping of cables, and thermal insulation can reduce these values, so the correct derating factors must always be applied during design.
Is 6491B XLPE?
6491B is not XLPE. Instead, it is insulated with Low Smoke Zero Halogen (LSZH) to BS7211.
Key Differences
- 6491X uses PVC insulation
- 6491B uses LSZH insulation, which emits low smoke and no toxic halogen gases in a fire
XLPE (cross-linked polyethylene) is used in other types of power cables but is not part of the 6491 range. 6491B is specifically chosen for environments where fire safety is a priority.
What is 6491B Cable?
6491B cable is a single-core, LSZH insulated building wire made to BS7211. It has the same copper conductor construction as 6491X but provides enhanced fire safety due to its insulation.
Applications
- Schools
- Hospitals
- Transport hubs
- Public buildings
Fire Performance
Low smoke, halogen-free, reducing harm to people and equipment in fire situations.
Comparison
6491X is suitable for standard indoor wiring, while 6491B is the safer choice for safety-critical environments.
6491X vs 6491B – Key Differences
| Feature | 6491X Cable (PVC) | 6491B Cable (LSZH) |
|---|---|---|
| Insulation Material | PVC | Low Smoke Zero Halogen |
| Standard | BS6004 | BS7211 |
| Voltage Rating | 450/750V | 450/750V |
| Fire Performance | Standard PVC | Low smoke, halogen-free |
| Applications | General wiring, conduit | Public buildings, safety-critical areas |
Frequently Asked Questions
Can 6491X cable be used outdoors?
It is designed for indoor use in conduit and trunking. Outdoor installations require additional protection against UV and moisture.
What sizes are available?
6491X is available from 1.5mm² up to 630mm² in multiple insulation colours.
Is 6491X the same as tri-rated cable?
No, tri-rated cable has a higher temperature rating and multiple standard approvals. 6491X is designed for standard wiring where tri-rated is not required.
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