APPLICATION

BURYCABLE FirePro 450/750V Mica XLPE LSZH cable is designed for fixed installations where project-specific circuit integrity under fire conditions is required. The product range is available with two, three, four or five insulated copper cores. Typical project environments include hospitals, hotels, high-rise buildings, airports, metro facilities, power stations and other critical infrastructure. Each insulated core incorporates a mica glass tape fire barrier beneath the XLPE insulation. The mica layer helps preserve electrical insulation during fire exposure. The LSZH outer sheath helps limit smoke emission and halogen acid gas release during burning. The conductors may be Class 1 solid or Class 2 stranded copper, depending on the selected core size and construction. An optional extruded inner covering may be used around the laid-up cores to provide a practically circular cable assembly. This construction does not include a separate bare copper circuit protective conductor (CPC). Where a protective conductor is required, the core configuration and colour identification must be selected according to the circuit design. The basic cable design is adapted from BS 7211. The applicable edition, fire test method, classification and duration must be confirmed against the project specification and supporting cable test documentation. This is an unarmoured cable intended for fixed installation. Provide additional mechanical protection where required by the installation conditions. Cable supports, joints and terminations should be selected to suit the required fire-resistant wiring system. Select the cable according to voltage rating, number of cores, conductor size, conductor class, installation conditions and project fire performance requirements.

STANDARDS

Basic design adapted from BS 7211:2012

FIRE PERFORMANCE

FIRE PERFORMANCE NOTE

BS 6387 is applicable to relevant cables

with an overall diameter not exceeding 20 mm.

BS 8491 is applicable to large-diameter

power cables with an overall diameter

greater than 20 mm when used for smoke

and heat control systems or certain other

active fire safety systems.

The appropriate test standard therefore

depends on the cable size and intended use.

IEC 60331-21 is retained only as a legacy

catalogue reference.

The applicable standard edition,

test classification and fire duration

must be confirmed against project requirements

and the relevant cable test report.

A specific CWZ classification,

BS 8491 category or fire duration

must not be assumed from the product name

or the presence of mica tape alone.

VOLTAGE RATING

450/750V

CABLE CONSTRUCTION

Conductor : Annealed copper conductor, solid or stranded according to BS EN 60228 class 1 or class 2.

Fire Barrier : Mica glass tape.

Insulation : XLPE type GP 8 according to BS 7655-1.3. Crosslinked polyolefin material type EI 5 according to EN 50363-5 can be offered as option.

Inner Covering Option : The optional inner covering, where used, shall consist of an extruded layer of synthetic polymeric material. It shall surround the laid-up two, three, four or five cores, giving the assembly a practically circular shape.

Outer Sheath : Extruded LSZH type LTS 4 according to BS 7655-6.1.

Outer Sheath Option : UV resistance, hydrocarbon resistance, oil resistance, anti-rodent and anti-termite properties can be offered as option.

COLOUR CODE

Insulation Colour :

2-core : Brown and blue.

3-core : Brown, black and grey.

4-core : Blue, brown black and grey.

5-core : Green/yellow, blue, brown black and grey.

Sheath Colour : White; other colours can be offered upon request.

PHYSICAL AND THERMAL PROPERTIES

Maximum temperature range during operation : 90°C

Maximum short circuit temperature (5 Seconds) : 250°C

Minimum bending radius :

OD<8mm : 4 × Overall Diameter

8mm≤OD≤12mm : 5 × Overall Diameter

OD>12mm : 6 × Overall Diameter

CONSTRUCTION PARAMETERS

ELECTRICAL PROPERTIES

Conductor operating temperature : 90°C

Ambient temperature : 30°C

CURRENT-CARRYING CAPACITIES (AMP) ACCORDING TO BS 7671:2008 TABLE 4E2A

Note: *With or without a protective conductor.

VOLTAGE DROP (PER AMP PER METER) ACCORDING TO BS 7671:2008 TABLE 4E2B

KEY FEATURES

- 450/750V rated voltage

- Two to five insulated copper cores

- Class 1 solid or Class 2 stranded conductors

- Mica glass tape fire barrier on each core

- XLPE insulation

- Optional extruded inner covering

- LSZH type LTS 4 outer sheath

- Low smoke zero halogen performance

- No separate bare copper CPC

- Unarmoured construction

- Basic design adapted from BS 7211

- Intended for fixed installation

- Fire performance confirmed for each cable size

SELECTION NOTES

For quotation, provide the number of cores,

conductor cross-sectional area,

conductor class and total cable length.

Confirm whether Class 1 solid

or Class 2 stranded conductors are required.

Provide the required circuit integrity

test standard, classification and duration.

The appropriate test method depends on

the cable overall diameter and intended use.

Confirm whether the selected cable size

falls within the scope of BS 6387

or BS 8491.

Also confirm insulation colours,

sheath colour, installation environment,

packing requirements and delivery destination.

This construction does not contain

a separate bare copper CPC.

Where a protective conductor is required,

select the appropriate insulated core

configuration or provide a separate

protective conductor according to

the installation design.

Outdoor exposure, wet locations,

underground routes and chemical exposure

require separate assessment.

Additional UV, oil, hydrocarbon,

rodent or termite resistance must be

specified and confirmed before supply.

For a fire-resistant wiring system,

assess the cable together with supports,

joints, glands and terminations.

RELATED CABLE TYPES

- 300/500V Mica XLPE LSZH Single Core Cable with CPC

- 300/500V Mica XLPE LSZH 2-3 Core Cable with CPC

- 450/750V Mica XLPE LSZH Single Core Cable

- BS7211 LSZH Fixed Wiring Cable

- BS7629-1 Fire Resistant Screened Cable

- BS7846 Fire Resistant Armoured Cable

FAQ

How many cores are available?

This product range is available with two,

three, four or five insulated cores.

The required configuration should be selected

according to the circuit design.

Does this cable contain a bare copper CPC?

No. This construction does not include

a separate bare copper CPC.

Where an earth or protective conductor

is required, select a configuration with

an appropriate insulated green/yellow core

or provide a separate protective conductor.

Does every core have a mica fire barrier?

Yes. Mica glass tape is applied as a fire

barrier to each insulated conductor

in this product construction.

The resulting circuit integrity performance

must be supported by the relevant test report.

Are the conductors solid or stranded?

The range includes Class 1 solid

and Class 2 stranded copper conductors.

Availability depends on the conductor size

and selected cable configuration.

Is the inner covering mandatory?

No. An extruded inner covering is optional.

It may be used around the laid-up cores

to provide a more circular cable assembly.

Is this cable armoured?

No. This is an unarmoured LSZH sheathed

fire-resistant cable.

Additional mechanical protection should be

provided where required by the installation.

Does every size comply with BS 6387?

Not automatically.

BS 6387 applies to relevant cables

with an overall diameter not exceeding 20 mm.

Compliance and classification must be verified

against the test report for the selected

cable size.

When is BS 8491 relevant?

BS 8491 applies to power cables

with an overall diameter greater than 20 mm

for specified smoke and heat control systems

and certain other active fire safety systems.

It should only be stated when the cable size,

application and supporting test report

are within the scope of that standard.

Does the cable automatically have a CWZ rating?

No specific CWZ classification or fire duration

should be assumed from the product title

or mica tape construction alone.

The required classification must be verified

against the relevant cable test report.

Is LSZH performance the same as fire resistance?

No.

LSZH performance concerns smoke

and halogen-related emissions during burning.

Fire resistance concerns maintaining

electrical circuit integrity under

defined fire test conditions.

Can this cable be used for emergency circuits?

It may be considered where its documented

fire performance matches the circuit

and installation requirements.

The complete wiring system, including

supports, joints, glands and terminations,

must also be suitable for the required duty.

Can this cable be installed outdoors

or underground?

Do not assume unrestricted outdoor

or direct-burial suitability.

The sheath properties, exposure conditions

and installation protection must be assessed

for the individual project.

How do I request a quotation from BURYCABLE?

Send the voltage rating, number of cores,

conductor size, conductor class,

cable length and required fire performance.

Include the installation environment,

colour requirements, packing details

and delivery destination.