BURYCABLE FirePro 450/750V single core Mica XLPE LSZH cable is designed for fixed installations where fire-resistant wiring is specified.
Typical project environments include hospitals, hotels, high-rise buildings, airports, metro facilities and power stations.
The cable comprises one annealed copper conductor, a mica glass tape fire barrier, XLPE insulation and an LSZH outer sheath.
The main conductor is available in Class 1 solid or Class 2 stranded construction, depending on the specified conductor size.
Unlike the 300/500V single-core-and-earth version, this construction does not include a separate bare copper circuit protective conductor (CPC).
The mica glass tape helps preserve electrical insulation during fire exposure. The LSZH sheath helps limit smoke emission and halogen acid gas release during burning.
The basic cable design is adapted from BS 7211:2012. The applicable circuit integrity test method and performance must be confirmed for the supplied construction.
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 specified wiring system and fire performance requirements.
Select the cable according to voltage rating, conductor size, conductor class, installation conditions and the required fire test performance.
Basic design adapted from BS 7211:2012
| Circuit Integrity | IEC 60331-21; BS 6387 |
| Flame Retardance (Single vertical wire or cable test) | IEC 60332-1-2; EN 60332-1-2 |
| Reduced Fire Propagation (Vertically-mounted bundled wires & cables test) | IEC 60332-3-24; EN 60332-3-24 |
| Halogen free | IEC 60754-1; EN 50267-2-1 |
| No Corrosive Gas Emission | IEC60754-2; EN 50267-2-2 |
| Minimum Smoke Emission | IEC 61034-2; EN 61034-2 |
FIRE PERFORMANCE NOTE
The shown cable has one insulated conductor and no additional metallic component. BS 6387:2013 is therefore outside the scope of this construction.
IEC 60331-21 is retained only as a legacy catalogue reference.
Confirm the applicable test method, standard edition, test arrangement and fire duration against project requirements and supporting test documentation before supply.
The presence of mica tape alone does not establish a certified fire rating.
450/750V
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.
CPC (Circuit Protective Conductor) : Uninsulated copper conductor.
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.
Insulation Colour : Brown or blue.
Sheath Colour: White; other colours can be offered upon request.
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
| Conductor | FRP450-mRZ1-U/R | |||||
|---|---|---|---|---|---|---|
| No. of Cores × Cross-sectional Area | Conductor Class | Nominal Insulation Thickness | Nominal Sheath Thickness | Min. Overall Diameter | Max. Overall Diameter | Approx. Weight |
| No.×mm² | mm | mm | mm | mm | kg/km | |
| 1×1.0 | 1 | 0.7 | 0.8 | 4.9 | 5.8 | 30 |
| 1×1.5 | 1 | 0.7 | 0.8 | 5.2 | 6.0 | 38 |
| 1×2.5 | 1 | 0.7 | 0.8 | 5.6 | 6.5 | 51 |
| 1×4 | 1 | 0.7 | 0.8 | 6.2 | 7.3 | 70 |
| 1×6 | 1 | 0.7 | 0.8 | 6.7 | 7.8 | 95 |
| 1×1.0 | 2 | 0.7 | 0.8 | 5.0 | 5.9 | 35 |
| 1×1.5 | 2 | 0.7 | 0.8 | 5.3 | 6.2 | 43 |
| 1×2.5 | 2 | 0.7 | 0.8 | 5.7 | 6.6 | 56 |
| 1×4 | 2 | 0.7 | 0.9 | 6.3 | 7.4 | 77 |
| 1×6 | 2 | 0.7 | 0.9 | 6.9 | 8.1 | 104 |
| 1×10 | 2 | 0.7 | 0.9 | 7.7 | 9.1 | 147 |
| 1×16 | 2 | 0.7 | 0.9 | 8.6 | 10.2 | 211 |
| 1×25 | 2 | 0.9 | 1.0 | 10.4 | 12.4 | 325 |
| 1×35 | 2 | 0.9 | 1.1 | 11.6 | 13.8 | 489 |
Conductor operating temperature : 90°C
Ambient temperature : 30°C
| Conductor cross-sectional area | Ref. Method A (enclosed in conduit in thermally insulating wall etc.) | Ref. Method B (enclosed in conduit on a wall or in trunking etc.) | Ref. Method C (clipped direct) | Ref. Method F (in free air or on a perforated cable tray, horizontal or vertical etc) Touching | Ref. Method G (in free air) Spaced by one cable diameter | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 cables, single-phase a.c. or d.c. | 3 or 4 cables, three-phase a.c. | 2 cables, single-phase a.c. or d.c | 3 or 4 cables, three-phase a.c. | 2 cables, single-phase a.c. or d.c. flat and touching | 3 or 4 cables, three-phase a.c. flat and touching or trefoil | 2 cables, single-phase a.c. or d.c. flat | 3 cables, three-phase a.c. flat | 3 cables, three-phase a.c. trefoil | 2 cables, single-phase a.c. or d.c. or 3 cables three-phase a.c. flat | ||
| Horizontal | Vertical | ||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| mm² | A | A | A | A | A | A | A | A | A | A | A |
| 1.0 | 14 | 13 | 17 | 15 | 19 | 17.5 | - | - | - | - | - |
| 1.5 | 19 | 17 | 23 | 20 | 25 | 23 | - | - | - | - | - |
| 2.5 | 26 | 23 | 31 | 28 | 34 | 31 | - | - | - | - | - |
| 4 | 35 | 31 | 42 | 37 | 46 | 41 | - | - | - | - | - |
| 6 | 45 | 40 | 54 | 48 | 59 | 54 | - | - | - | - | - |
| 10 | 61 | 54 | 75 | 66 | 81 | 74 | - | - | - | - | - |
| 16 | 81 | 73 | 100 | 88 | 109 | 99 | - | - | - | - | - |
| 25 | 106 | 95 | 133 | 117 | 143 | 130 | 161 | 141 | 135 | 182 | 161 |
| 35 | 131 | 117 | 164 | 144 | 176 | 161 | 200 | 176 | 169 | 226 | 201 |
| Conductor cross-sectional area | 2 cables d.c. | 2 cables, single-phase a.c. | 3 or 4 cables, three-phase a.c. | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ref. Methods A&B (enclosed in conduit or trunking) | Ref. Methods C, F&G (clipped direct, on trays or in free air) | Ref. Methods A&B (enclosed in conduit or trunking) | Ref. Methods C, F&G (clipped direct, on trays or in free air) | |||||||||||||||||||
| Cables touching | Cables spaced* | Cables touching, Trefoil | Cables touching, flat | Cables spaced*, flat | ||||||||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||||||||||||||
| mm² | mV/A/m | mV/A/m | mV/A/m | mV/A/m | mV/A/m | mV/A/m | mV/A/m | mV/A/m | ||||||||||||||
| 1.0 | 46 | 46 | 46 | 46 | 40 | 40 | 40 | 40 | ||||||||||||||
| 1.5 | 31 | 31 | 31 | 31 | 27 | 27 | 27 | 27 | ||||||||||||||
| 2.5 | 19 | 19 | 19 | 19 | 16 | 16 | 16 | 16 | ||||||||||||||
| 4 | 12 | 12 | 12 | 12 | 10 | 10 | 10 | 10 | ||||||||||||||
| 6 | 7.9 | 7.9 | 7.9 | 7.9 | 6.8 | 6.8 | 6.8 | 6.8 | ||||||||||||||
| 10 | 4.7 | 4.7 | 4.7 | 4.7 | 4.0 | 4.0 | 4.0 | 4.0 | ||||||||||||||
| 16 | 2.9 | 2.9 | 2.9 | 2.9 | 2.5 | 2.5 | 2.5 | 2.5 | ||||||||||||||
| r | x | z | r | x | z | r | x | z | r | x | z | r | x | z | r | x | z | r | x | z | ||
| 25 | 1.85 | 1.85 | 0.31 | 1.90 | 1.85 | 0.190 | 1.85 | 1.85 | 0.28 | 1.85 | 1.60 | 0.27 | 1.65 | 1.60 | 0.165 | 1.60 | 1.60 | 0.190 | 1.60 | 1.60 | 0.27 | 1.65 |
| 35 | 1.35 | 1.35 | 0.29 | 1.35 | 1.35 | 0.180 | 1.35 | 1.35 | 0.27 | 1.35 | 1.15 | 0.25 | 1.15 | 1.15 | 0.155 | 1.15 | 1.15 | 0.180 | 1.15 | 1.15 | 0.26 | 1.20 |
Note: *Spacings larger than one cable diameter will result in a large voltage drop.
r = conductor resistance at operating temperature
x = reactance
z = impedance
KEY FEATURES
- 450/750V rated voltage
- Single insulated copper conductor
- Class 1 solid or Class 2 stranded conductor options
- Mica glass tape fire barrier
- XLPE insulation
- LSZH type LTS 4 outer sheath
- No integral CPC or armour
- Basic design adapted from BS 7211
- Intended for fixed installation
- Fire performance verified for the specified construction
SELECTION NOTES
For quotation, provide the conductor cross-sectional area, required conductor class and total cable length.
Confirm the insulation colour, sheath colour, installation environment and packing requirements.
Specify the required circuit integrity test method, classification and fire duration.
This cable does not include an integral CPC. Any protective conductor required by the circuit design must be addressed separately.
Class 2 stranded construction should not be treated as a continuous-flexing cable.
Outdoor exposure, wet locations, underground routes and chemical exposure require separate assessment of the cable and installation protection.
Additional UV, oil or hydrocarbon resistance must be specified and confirmed before supply.
For a fire-resistant wiring system, assess the cable together with the selected supports, joints and terminations.
RELATED CABLE TYPES
450/750V Mica XLPE LSZH Multicore Cable
300/500V Mica XLPE LSZH Single Core Cable with CPC
300/500V Mica XLPE LSZH 2-3 Core Cable with CPC
BS7211 LSZH Fixed Wiring Cable
FAQ
What is this cable used for?
This cable is intended for fixed installations where fire-resistant wiring is specified.
Typical project environments include hospitals, hotels, high-rise buildings, airports, metro facilities and power stations. Suitability depends on the circuit requirements and supporting test documentation.
Does this cable include an earth conductor?
No. The construction contains one insulated copper conductor and no integral CPC.
It must not be confused with the 300/500V single-core-and-earth version.
Is the conductor solid or stranded?
The catalogue includes Class 1 solid and Class 2 stranded copper conductors.
Confirm the conductor class and available size before ordering.
Does this cable have a separate sheath?
Yes. The mica-wrapped conductor is insulated with XLPE and covered by a separate LSZH type LTS 4 outer sheath.
This is not a non-sheathed single-core building wire.
Is BS 6387 applicable to this construction?
BS 6387:2013 does not apply to the shown single-core construction because it has no additional metallic component.
A BS 6387 CWZ classification is not claimed for this configuration. The appropriate fire test method and required performance must be agreed and verified.
Is LSZH performance the same as circuit integrity?
No. LSZH concerns smoke and halogen-related emissions during burning.
Circuit integrity concerns maintaining electrical function under specified fire test conditions.
These are separate performance requirements.
Can this cable be used 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 project.
How do I request a quotation from BURYCABLE?
Send the voltage rating, conductor size, conductor class, cable length and required fire test performance.
Include the installation environment, colour requirements, packing details and delivery destination.
