When subway tunnels fill with smoke and fire alarms echo through high-rise buildings, threatening lives, what ensures continuous power supply to critical equipment? The answer lies in premium fire-resistant single-core cables. These are not just ordinary cables but lifelines during emergencies, providing crucial time for evacuation and firefighting operations.
1. Core Fireproof Technology: Double-Layer Mica Tape Wrapping
The premium cable features high-purity copper conductors wrapped with two layers of mica tape. Mica, a natural high-temperature resistant insulating material, maintains its insulating properties even under direct flame exposure. The 80% overlap rate in the double-layer wrapping ensures complete coverage of the copper conductor, creating a robust fire barrier. During fire incidents, this design effectively prevents flame spread and conductor short circuits, ensuring uninterrupted power transmission to critical systems.
2. Superior Flame Retardancy and Low Smoke Zero Halogen Properties
Beyond fire resistance, these cables demonstrate exceptional flame-retardant performance. The outer sheath utilizes premium LSZH (Low Smoke Zero Halogen) material compliant with BS 7655-6.1 standards. When exposed to fire, this material produces minimal smoke and releases no toxic gases, significantly reducing hazards to personnel and preventing corrosion of sensitive equipment. Compared to traditional PVC cables, LSZH cables offer substantial advantages in environmental safety and protection.
3. Compliance with Stringent International Standards
The fire-resistant cables are manufactured in strict accordance with BS 7211 standards and meet multiple international fire safety certifications, including:
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Circuit Integrity:
IEC 60331-21; BS 6387 CWZ; DIN VDE 0472-814(FE180)
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Flame Retardancy (Single Vertical Burning Test):
EN 60332-1-2; IEC 60332-1-2
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Flame Retardancy (Bundle Vertical Burning Test):
EN 60332-3-24 (cat. C); IEC 60332-3-24
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Halogen-Free Properties:
IEC 60754-1; EN 50267-2-1
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Low Smoke Emission:
IEC 61034-1&2; EN 61034-1&2
4. Technical Specifications
Key technical parameters include:
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Rated Voltage:
300/500V
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Conductor:
Bare annealed copper wire, multi-stranded per IEC(EN) 60228 Class 2
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Fireproof Layer:
Mica glass tape with double-layer wrapping at 80% overlap
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Insulation:
PVC (or XLPE) with excellent electrical insulation properties
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Operating Temperature Range:
-30°C to +90°C (fixed installation)
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Short Circuit Temperature:
250°C
5. Dimensional Specifications
|
Nominal Cross-Section (mm²)
|
Conductor Structure (No./mm)
|
Nominal Insulation Thickness (mm)
|
Nominal Sheath Thickness (mm)
|
Nominal Diameter (mm)
|
Approximate Weight (kg/km)
|
|
1.5
|
7/0.53
|
0.5
|
0.5
|
4.4
|
29
|
|
2.5
|
7/0.67
|
0.5
|
0.5
|
4.9
|
40
|
|
4
|
7/0.85
|
0.5
|
0.5
|
5.5
|
55
|
6. Application Areas
These fire-resistant cables are extensively used in critical infrastructure requiring reliable power supply:
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Underground tunnels (ensuring lighting, ventilation, and drainage systems)
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Emergency lighting systems
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Fire alarm networks
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Power generation facilities
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Elevator and escalator safety circuits
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High-rise building safety systems
In life safety situations, every detail matters. Premium fire-resistant cables provide essential protection during emergencies, ensuring continuous operation of critical systems when it matters most.
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