450/750V SR Insulated Fire Resistant Control Cable – BS 7629-1 LSZH

Control Cables
Description

450/750V SR Insulated Fire Resistant Control Cable

Product Overview

The 450/750V SR Insulated Fire Resistant control cables are designed, manufactured, and tested for general application in power supply and signal wiring, specifically for emergency circuit and fire circuit control. The cable features a fire-resistant silicone rubber insulation and a thermoplastic LSZH outer sheath, providing reliable performance in critical safety applications.

The basic design conforms to BS 7629-1, ensuring suitability for fixed installations where fire resistance is essential.

Key Features & Benefits

  • Fire Resistant: Silicone rubber insulation maintains circuit integrity in fire conditions.

  • LSZH Outer Sheath: Thermoplastic low smoke zero halogen compound reduces toxic fumes and smoke.

  • Reliable Performance: Plain annealed copper conductors, stranded to IEC(EN) 60228 Class 2.

  • Wide Temperature Range: Operates from -30°C to +90°C in fixed state.

  • Flexible Installation: Minimum bending radius of 7.5 x overall diameter.

  • Voltage Rating: 450/750V.

  • Standards Compliant: Basic design to BS 7629-1.

Typical Applications

  • Power supply and signal wiring

  • Emergency circuit control

  • Fire circuit control

  • Fixed installations requiring fire-resistant cables

Construction Details

  • Conductors: Plain annealed copper wire, stranded according to IEC(EN) 60228 Class 2.

  • Insulation: Fire resistant silicone rubber compound.

  • Cabling: Cores cabled together in concentric layers with suitable non-hygroscopic fillers.

  • Outer Sheath: Thermoplastic LSZH compound.

  • Sheath Colour: Red (other colours on request).

Insulation Colour:

Without earth conductor:

  • 2 cores: Blue – Brown

  • 3 cores: Brown – Black – Grey

  • 4 cores: Blue – Brown – Black – Grey

  • 5 cores: Blue – Brown – Black – Grey – Black

With earth conductor:

  • 3 cores: Yellow/Green – Blue – Brown

  • 4 cores: Yellow/Green – Brown – Black – Grey

  • 5 cores: Yellow/Green – Blue – Brown – Black – Grey

Technical Specifications

Electrical Properties

Parameter Value
Dielectric Test 2500 V r.m.s. x 5' (core/core)
Insulation Resistance ≥300 MΩ x km (at 20°C)
Short Circuit Temperature 350°C
Conductor Operating Temperature 90°C
Ambient Temperature 30°C

Physical & Thermal Properties

Parameter Value
Temperature Range (Fixed State) -30°C to +90°C
Temperature Range (Mobile State) -20°C to +50°C
Minimum Bending Radius 7.5 x Overall Diameter

Construction Parameters

Cable Code No. of Core x Cross Section (mm²) Nominal Insulation Thickness (mm) Nominal Sheath Thickness (mm) Nominal Overall Diameter (mm) Approx. Weight (kg/km)
2 core 2 x 1.5 0.8 1.0 7.8 96
2 core 2 x 2.5 0.9 1.1 9.2 138
2 core 2 x 4.0 0.9 1.2 10.5 189
3 core 3 x 1.5 0.8 1.0 8.3 116
3 core 3 x 2.5 0.9 1.1 9.8 169
3 core 3 x 4.0 0.9 1.2 11.6 246
4 core 4 x 1.5 0.8 1.1 9.3 147
4 core 4 x 2.5 0.9 1.2 11.3 222
4 core 4 x 4.0 0.9 1.3 12.5 299
5 core 5 x 1.5 0.8 1.1 10.5 180
5 core 5 x 2.5 0.9 1.2 12.3 259
5 core 5 x 4.0 0.9 1.3 14.0 359

Note: All values are nominal. Actual dimensions and weights may vary within standard manufacturing tolerances.

Standards & Compliance

  • Basic Design: BS 7629-1

Ordering Information

To request a quote or place an order, please provide the following information:

  • Product Type: 450/750V SR Insulated Fire Resistant Control Cable

  • Voltage Rating: 450/750V

  • Number of Cores and Cross-Section: e.g., 2 x 1.5 mm², 5 x 4.0 mm²

  • Earth Conductor: With or Without

  • Sheath Colour: Red (standard) or other on request

  • Quantity: Total length in meters