BS 7629-1 450/750V SR Insulated & Overall Screened Fire Resistant Control Cable
BS 7629-1 450/750V SR Insulated & Overall Screened Fire Resistant Control Cable is a flexible copper control cable for power, signal, emergency-circuit and fire-circuit wiring where strong rejection of electrostatic noise is required. It combines Class 5 flexible copper conductors, fire-resistant silicone-rubber insulation, aluminum/polyester overall screening with tinned-copper drain wire, and an LSZH outer sheath.
PRODUCT OVERVIEW
The cable is based on a BS 7629-1 design concept adapted for a 450/750V flexible screened control-cable construction. Its Class 5 plain annealed copper conductors provide flexibility for installation and termination, while fire-resistant silicone-rubber insulation type EI2 forms the primary insulation system around each core. The insulated cores are laid together with suitable non-hygroscopic fillers and wrapped with an aluminum/polyester overall screen, supported by a tinned-copper drain wire for screen continuity and termination.
The product is intended for circuits where fire resistance and noise rejection are both important. Compared with an unscreened fire-resistant control cable, the overall screen provides an additional barrier against electrostatic interference in power and signal wiring. The LSZH outer sheath supports installation in enclosed or occupied environments where reduced smoke and halogen emissions are required during fire conditions.
KEY FEATURES
- Basic design adapted from BS 7629-1.
- Rated voltage: 450/750V.
- Flexible plain annealed copper conductor to IEC/EN 60228 Class 5.
- Fire-resistant silicone-rubber insulation type EI2 to BS 7655-1.1.
- Aluminum/polyester overall screen with tinned-copper drain wire.
- Thermoplastic LSZH outer sheath type LTS3; thermosetting SW2-SW4 can be offered.
- Designed for general power and signal wiring, emergency circuits and fire-circuit control.
- Overall screening for applications requiring high rejection of electrostatic noise.
- Available from 2-core to 19-core in the listed range.
- Operating temperature: -30°C to +90°C.
- Installation temperature: -20°C to +50°C.
- Minimum bending radius: 7.5 × overall diameter.
WHY THIS CONSTRUCTION IS USED
This cable combines three functional requirements in one construction: flexible control wiring, fire-resistant circuit performance and overall electrostatic screening. The Class 5 conductor supports easier routing and termination than a rigid solid-conductor design; the silicone-rubber insulation provides the fire-resistant core insulation; and the aluminum/polyester screen with tinned-copper drain wire provides a defined screen layer around the multicore assembly.
For control and signal circuits installed close to power equipment, switching devices or other sources of electrical disturbance, the overall screen is especially relevant because it helps separate the internal control conductors from external electrostatic interference. The screen should be terminated in accordance with the project grounding and EMC practice.
CABLE CONSTRUCTION
Voltage Rating | 450/750V |
Conductor | Plain annealed flexible copper to IEC/EN 60228 Class 5 |
Insulation | Fire-resistant silicone-rubber compound type EI2 |
Cabling | Cores cabled in concentric layers with suitable non-hygroscopic fillers |
Overall Screen | Aluminum/polyester tape with tinned-copper drain wire |
Outer Sheath | Thermoplastic LSZH LTS3; optional thermosetting LSZH SW2-SW4 |
Sheath Colour | Red; other colours on request |
STANDARD BASIS & FIRE PERFORMANCE
The brochure states that the basic design is adapted from BS 7629-1. The product also lists the following fire-performance references for circuit integrity, mechanical shock, water spray, flame propagation, halogen content and smoke emission.
Performance | Referenced Test / Standard |
Circuit integrity | IEC 60331-21; BS 6387 CWZ; DIN VDE 0472-814 (FE180); BS 8434-1 (30 min); BS 5839-1 Clause 26 2d; CEI 20-36/2-1; SS229-1; NBN C 30-004 (F3); NF C32-070-2.3 (CR1) |
Circuit integrity with mechanical shock | EN 50200 (PH30/60); CEI 20-36/4-0 |
Circuit integrity with mechanical shock & water spray | EN 50200 Annex E |
System circuit integrity | DIN 4102-12, E30 depending on lay system |
Flame retardance – single vertical wire | EN/IEC/BS EN 60332-1-2 and listed equivalents |
Reduced fire propagation – bundled cables | EN/IEC/BS EN 60332-3-24 (Cat. C) and listed equivalents |
Halogen free | IEC 60754-1 and listed equivalents |
No corrosive gas emission | IEC 60754-2 and listed equivalents |
Minimum smoke emission | IEC 61034-1&2 and listed equivalents |
No toxic gases | NES 02-713; NF C 20-454 |
PRODUCT APPLICATIONS
- Power and signal wiring where a fire-resistant screened control cable is required.
- Emergency-circuit control wiring.
- Fire-circuit control systems.
- Control and signal circuits installed in electrically noisy environments.
- Building-services and industrial control circuits requiring LSZH materials.
- Multicore control systems requiring flexible Class 5 conductors and overall screening.
The listed range covers small flexible control sizes for 2-, 3- and 4-core circuits and larger multicore configurations for 7-, 12- and 19-core control systems. Conductor cross sections in the construction table range from 0.75 mm² to 2.5 mm².
| No. of Cores × Cross Section | Insulation mm | Sheath mm | Overall Diameter mm | Approx. Weight kg/km |
|---|---|---|---|---|
| 2x0.75 | 0.7 | 0.9 | 7.6 | 69 |
| 2x1.0 | 0.7 | 1.0 | 8.0 | 78 |
| 2x1.5 | 0.8 | 1.0 | 8.3 | 88 |
| 2x2.5 | 0.9 | 1.1 | 9.8 | 123 |
| 3x0.75 | 0.7 | 0.9 | 8.0 | 84 |
| 3x1.0 | 0.7 | 1.0 | 8.2 | 86 |
| 3x1.5 | 0.8 | 1.0 | 8.8 | 112 |
| 3x2.5 | 0.9 | 1.1 | 10.4 | 159 |
| 4x0.75 | 0.7 | 1.0 | 8.7 | 103 |
| 4x1.0 | 0.7 | 1.1 | 8.9 | 110 |
| 4x1.5 | 0.8 | 1.1 | 9.8 | 141 |
| 4x2.5 | 0.9 | 1.2 | 11.4 | 196 |
| 7x1.0 | 0.7 | 1.1 | 10.8 | 176 |
| 7x1.5 | 0.8 | 1.2 | 11.7 | 218 |
| 7x2.5 | 0.9 | 1.3 | 13.4 | 305 |
| 12x1.0 | 0.7 | 1.2 | 13.5 | 275 |
| 12x1.5 | 0.8 | 1.3 | 15.3 | 352 |
| 12x2.5 | 0.9 | 1.5 | 17.9 | 505 |
| 19x1.0 | 0.7 | 1.4 | 16.4 | 408 |
| 19x1.5 | 0.8 | 1.5 | 18.2 | 535 |
| 19x2.5 | 0.9 | 1.6 | 21.1 | 760 |
Request the Complete Data Sheet
From Production to Delivery
From raw material preparation to final shipmen, every stage is caretuly controled to ensure consistent conductor quality, reliable pertormance,and sae delivery. Our roduction,
inspection, packaging, and logistics processes are managed in accordance with applicable standards and project requirements.
Production
Class 5 flexible copper conductors are insulated with fire-resistant silicone rubber, cabled with suitable non-hygroscopic fillers, wrapped with aluminum/polyester tape and a tinned-copper drain wire, then finished with the specified LSZH outer sheath.
Inspection
Inspection focuses on conductor flexibility and construction, insulation quality, screen continuity, drain-wire integrity, sheath condition, dielectric test, insulation resistance, dimensional checks and required fire-performance documentation.
Packaging
Finished cables are wound onto suitable drums according to ordered size and length. Cable ends are secured and protected, and drum identification can include cable type, voltage, conductor size, core count, length and project reference.
Shipping
Before shipment, drums and accompanying technical documents are checked against the purchase order and packing list. Test reports, inspection records and cable identification documents can be prepared according to project requirements.
Frequently Asked Questions
What is the basic design reference?
The brochure states that the basic design is adapted from BS 7629-1.
What conductor class is used?
Flexible IEC/EN 60228 Class 5 copper conductors.
Why is the cable overall screened?
The overall aluminum/polyester screen with tinned-copper drain wire is used where high rejection of electrostatic noise is required.
What insulation is used?
Fire-resistant silicone-rubber compound type EI2.
What fire-performance level is listed for mechanical shock?
EN 50200 PH30/60 is listed.
What multicore sizes are available?
The listed construction range includes 2, 3, 4, 7, 12 and 19 cores.
Request for Free Consultation
Contact Information
Send us your cable requirements and our team will respond quickly with product recommendations, technical support and quotation details.
