Introduction to the 3-Pair Armoured Signal/Telemetry Cable
Product overview:The SFX/ISP3-SWA-PE-BLK-1 is a 3-pair (3PR) armoured telemetry and signalling cable purpose-built for CCTV, RS-485/serial links and other security or instrumentation applications. Each pair is individually foil-screened to minimise crosstalk and electromagnetic interference, while steel wire armour (SWA) provides robust mechanical protection. A black UV-resistant PE outer jacket (RAL 9005) completes the construction for reliable outdoor and industrial use. Rated to 600 V and specified for a temperature range of -20°C to +80°C, this cable balances signal integrity, durability and value for a wide range of installation scenarios.
Key features at a glance
- 3 individually-foil screened pairs— reduced interference and better pair-to-pair isolation for sensitive telemetry and data signals.
- Stranded tinned copper conductors— 0.33 mm² (22 AWG equivalent, 7-strand) for flexibility and improved corrosion resistance.
- Steel Wire Armour (SWA)— enhanced mechanical protection for ducted, buried and exposed runs.
- PE insulation and outer jacket (black)— UV resistant for long-term external use.
- Electrical & environmental— 600 V rating, -20°C to +80°C operating temperature, CPR classification Fca.
- Sold per metre— cut-to-length supply for flexible site needs.
Detailed specifications and benefits
The cable uses stranded tinned copper conductors sized at 0.33 mm² (approximately 22 AWG equivalent). Seven strands per conductor provide the flexibility needed for tight routing and frequent handling during installation. Tinning improves corrosion resistance, which is particularly useful in humid or industrial environments where oxidation could degrade signal quality over time.
Each pair is insulated with HDPE and individually foil-screened. Individual pair screening is a meaningful advantage for differential signalling (for example RS-485) and low-voltage telemetry because it reduces crosstalk between adjacent pairs and provides a controlled return path for high-frequency noise. The individual foil screens also simplify pair-level screening termination where required.
Steel Wire Armour offers mechanical robustness that unarmoured cables lack. SWA protects against crushing, rodent damage and mechanical abrasion, making the cable well-suited to installations in ducts, exposed outdoor runs and industrial locations where impact risks exist. The outer PE jacket (black, RAL 9005) is UV-resistant, providing long-term outdoor durability and protection from sunlight-induced degradation.
With a rated voltage of 600 V and an operating temperature range of -20°C to +80°C, this cable supports a broad range of environments and power requirements for signal-level applications. Notified CPR classification Fca indicates limited reaction to fire; designers and installers should consult local building and fire regulations for internal concealed routes or areas with stricter fire-performance requirements.
- Overall diameter:approximately 11.40 mm ±0.20 mm — compact enough for many ducts and trays where armoured protection is still required.
- Stranded diameter:0.64 mm (stranded overall) — balances flexibility with mechanical stability.
- Termination:Proper termination of the SWA is essential. Use suitable armour clamps and glands rated for armoured PE cables and ensure the armour is correctly earthed where required by regulations.
- Bend radius:Follow manufacturer recommendations and maintain appropriate bend radii to avoid conductor damage and maintain signal performance.
Use cases and scenarios where this cable excels
The cable is ideal for CCTV telemetry lines where signal integrity over moderate distances is crucial. Individual pair screening reduces interference from power lines, motors and nearby data cables — common noise sources around camera installations. The SWA protects camera runs that are routed in exposed positions or in ducts where mechanical damage is possible.
RS-485 and similar differential signalling standards benefit from pair screening. Each pair’s foil screen helps keep the differential mode signal clean and reduces susceptibility to common-mode noise. Installers working with access control networks, building management systems (BMS) or industrial telemetry will find the cable well-suited to multi-pair serial networks.
Security systems often require robust cabling that can be run externally or in bermed ducts. The armoured construction reduces failure risk from crushing and tampering, while tinned conductors and PE insulation improve longevity in harsher environments.
On industrial sites where mechanical hazards, occasional vehicle overrun or rodent activity are concerns, SWA cables offer a reliable choice. The cable can be used for signals in pump houses, conveyor control, remote sensors and instrumentation where both signal integrity and physical protection are required.
Comparisons with similar products on the market
When selecting cabling for telemetry and signalling, the principal trade-offs are screening strategy, mechanical protection, conductor size and cost. Here’s how SFX/ISP3-SWA-PE-BLK-1 compares to common alternatives:
- Unarmoured multi-pair screened cable:Unarmoured cable may be cheaper and more flexible but lacks mechanical protection. In exposed or ducted runs where crushing or rodent damage is possible, SWA-equipped cable offers greater longevity and lower lifecycle risk.
- Overall-screened cable (single overall foil/braid):Overall screens are effective against external interference but do not prevent pair-to-pair crosstalk as well as individually screened pairs. For multi-pair serial networks or mixed-signal installations, individual pair screening provides better pair isolation.
- Solid conductor vs stranded tinned conductors:Solid conductors are less expensive and may be suitable for fixed, enclosed installations, but stranded tinned conductors provide greater flexibility during installation and better corrosion resistance for outdoor and damp environments.
- Higher gauge / fewer pairs:For longer-distance power or video runs where voltage drop matters, larger conductor sizes may be preferred. The 0.33 mm² (22 AWG equiv) conductors here are optimised for signal and low-current telemetry rather than high-current power distribution.
- Fibre optic alternatives:Fibre eliminates electrical interference and supports very high bandwidths over long distances, but the cost, termination complexity and the need for a power/data conversion at endpoints make copper still the practical choice in many CCTV/RS-485/security deployments.
Customer feedback and installer notes
No formal public customer testimonials were supplied with the manufacturer datasheet. However, installer and site-operator feedback for cables of this construction typically highlights the following points:
- Easy routing in ducts due to a compact overall diameter despite the SWA layer.
- Noticeable reduction in interference when compared to unshielded multi-pair runs, especially in mixed-signal environments.
- Clear savings in replacement and repair costs where mechanical protection prevented damage from site activities or pests.
- Importance of correct gland selection and proper termination of the armour and pair drains to ensure screening effectiveness and safety compliance.
Prospective buyers should request sample lengths or consult installers for hands-on impressions if site-specific concerns (bend radius, gland compatibility, or aesthetic routing) are important.
Cost and value
The product is sold per metre (cut-to-length), making it practical for bespoke site requirements and minimising waste. With a cost price of 2.62 and a suggested price of 3.12 per metre, the cable represents a competitive option when balancing the benefits of individual pair screening, armoured protection and UV-resistant PE jacketing. For many CCTV and telemetry projects, the additional upfront cost compared with unarmoured or overall-screened cable is offset by lower failure rates and reduced maintenance expenses.
Conclusion: Why choose SFX/ISP3-SWA-PE-BLK-1?
The SFX/ISP3-SWA-PE-BLK-1 3-pair armoured telemetry cable is a practical, well-balanced choice for installers and system designers who need reliable signal performance and physical protection in outdoor, industrial or exposed routing scenarios. Individual pair screening improves signal integrity for RS-485, telemetry and security applications, while steel wire armour and a UV-resistant PE jacket provide peace of mind where mechanical hazards are present.
Its compact overall diameter, stranded tinned conductors and industry-standard ratings make it versatile for many CCTV and instrumentation projects. When proper termination of the armour and screens is observed and appropriate glands are used, this cable delivers long-term, low-maintenance performance — making it a cost-effective selection for professional installations where both durability and signal quality matter.
