FR6387 BS 6387 Fire-Resistant Cables for Life-Safety Circuits

FR6387 fire-resistant cables use stranded copper conductors, silicone insulation, a mica fire barrier and a red LSZH sheath for circuits that must remain operational during a fire. Choose between UN unscreened and OS overall-screened constructions, then confirm the core count, conductor size, rated voltage and project test requirements for the selected model.

Representative FR6387 Cable Models

These three representative models show the main selection paths in the FR6387 range: a multicore UN cable, a higher-cross-section UN cable and an OS cable with an overall aluminium-foil screen and tinned-copper drain wire. Other configurations may be available; specify the exact model and project requirements when requesting a quotation.

                 

FR6387-UN-0710

7 × 1.0 mm² Unscreened Cable

A 300/500 V, 7-core UN construction with an 8.4 ± 0.2 mm outer diameter. Consider it when several fire-survival control cores are needed without an overall screen.

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FR6387-UN-0225

2 × 2.5 mm² Unscreened Cable

A 600/1000 V, 2-core UN model with a 7.8 ± 0.2 mm outer diameter. Use it as the starting point for a two-core circuit that needs 2.5 mm² conductors but no overall EMI screen.

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FR6387-OS-0225

2 × 2.5 mm² Overall-Screened Cable

A 300/500 V, 2-core OS model with aluminium-foil screening, a tinned-copper drain wire and an 8.0 ± 0.2 mm outer diameter. Consider it where the circuit needs added EMI protection.

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How Do I Choose an FR6387 Cable?

Start with the circuit and installation environment, not only the fire rating. The exact model must match the required screen, number of cores, conductor cross-section, voltage rating and project standard.

Quick Comparison

Use the table to narrow the choice by screen, cores, cross-section and voltage. Final cable selection must also account for circuit design, installation method, fire-test requirements and local code.

What Do OS and UN Mean?

OS and UN describe the screening construction, not the fire rating. Both selected constructions use stranded copper conductors, silicone insulation, a mica fire barrier and a red LSZH outer sheath.

OS: Overall Screened

The OS construction adds an overall aluminium-foil screen and a tinned-copper drain wire around the insulated cores. This is the relevant option when the cable route or connected equipment requires additional EMI control.

UN: Unscreened

The UN construction omits the overall screen. It is a simpler choice for fixed fire-survival circuits where the electrical design does not require screened cable.

Where Are FR6387 Cables Used?

FR6387 cables are intended for fixed life-safety and emergency circuits that require circuit integrity during fire exposure. The final choice must follow the system design, applicable code and approval requirements.

Frequently Asked Questions

RFQ Checklist

You do not need to translate the entire specification into a model number. Provide the following project details so the cable construction and supporting documents can be checked before quotation:

• Required fire-test standard and category, including any FE180 or PH120 requirement

• Screened OS or unscreened UN construction

• Number of cores and conductor cross-section in mm²

• System voltage, load, route length and voltage-drop limit

• Installation environment, including indoor, outdoor, conduit, tray or mechanical-protection needs

• Required operating temperature, bending radius or outer-diameter limit

• Quantity, packing length, drum or roll preference and labeling requirements

• Required approvals, test reports, declarations and project submittal documents