| Category | Fire Resistant Instrumentation Cable, Shielded, LSZH 2×2.5mm² |
| Conductor | 2.5mm² (14 AWG) Stranded Bare Copper, 49/0.24mm |
| Shield | Polyester Tape + Aluminum Foil, 100% coverage, drain wire |
| Jacket | LSZH, Orange |
| Standards | IEC 60331-1, IEC 60332-1, CNS 11175, EN 50200, EN 61034-2, BS 5839-1, BS 6387 |
| Certifications | CE (EU Declaration of Conformity), RoHS compliant. Manufactured in an ISO 9001 certified facility. Manufacturer type test reports to the standards listed above are available on request. How these standards map to Singapore’s SS 299 requirement. |
| Packaging | 500m / Reel |
Heizka’s Fire Resistant Cable Shielded, LSZH 2×2.5mm² is a silicone-insulated instrumentation cable built for fire alarm and life-safety circuits that need the lowest loop resistance and highest current headroom in the shielded family. Built with 2.5mm² (14 AWG) stranded bare copper conductors, a silicone insulation system rated for sustained high-temperature exposure, and an overall polyester tape + aluminum foil shield with drain wire, it keeps fire alarm and signaling circuits free of electrical noise while maintaining circuit integrity under flame.
As the largest-gauge Fire Resistant Cable Shielded variant, it is the right choice for longer fire alarm circuit runs, higher signaling current, and control panels serving wide detector loops, in indoor and residential installations. The LSZH (Low Smoke Zero Halogen) jacket limits flame spread and toxic smoke generation, and every reel carries continuous footage markers to reduce installation waste. Every reel is manufactured and tested to IEC 60331-1, IEC 60332-1, EN 50200, EN 61034-2, BS 5839-1, and BS 6387 fire-survival standards, and backed by Heizka’s multi-year warranty for long-term field performance.
Fire Resistant Cable Shielded Features
- ✓Purpose-built for fire alarm systems and signaling devices
- ✓Shielded construction (polyester tape + aluminum foil + drain wire) for EMI/RFI immunity
- ✓Silicone insulation for high heat and fire resistance
- ✓2.5mm² (14 AWG) stranded bare copper conductors for longer runs and higher signaling current
- ✓LSZH jacket – halogen-free, low-smoke flame retardant
- ✓Rated voltage 300V
- ✓Continuous footage markers printed on the cable jacket
- ✓Designed for indoor and residential fire-safety installations
- ✓Designed in the USA
- ✓Packaging: 500m/Reel
Standard Compliance
Every Fire Resistant Cable Shielded reel in this series is tested against the following standards:
IEC 60332-1 (Flame Propagation)
CNS 11175
EN 50200 (Fire Resistance, Alarm Circuits)
EN 61034-2 (Smoke Density)
BS 5839-1
BS 6387 (Fire Resistance Characteristics)
Order the Fire Resistant Cable Shielded 2×2.5mm² using the item number below.
Ordering Information
| Item # | Description |
|---|---|
| HER25S2LZ | Fire Resistant Instrumentation Cable 2×2.5mm² (14AWG, Shielded, Twisted Pair, Orange, LSZH, 500m/Reel) |
Technical Specifications
The tables below summarize the full construction and performance data for this Fire Resistant Cable Shielded LSZH product, sourced directly from Heizka’s technical catalogue.
Construction / Dimensions
| No. of cores | 2 Core |
| Conductor material | Stranded Bare Copper |
| Conductor construction | 2.5mm², 49/0.24 ±1%D mm |
| Insulation material | Silicone Insulation |
| Insulation coverage rate | 100% |
| Insulation thickness | 0.6mm ± 0.05mm |
| Insulation diameter | 3.1 ± 0.10 mm |
| Shield material | Polyester Tape + Aluminum Foil |
| Shield coverage rate | 100% |
| Drain wire | 7/0.18 TC mm |
| Jacket material | LSZH (Orange) |
| Jacket thickness | 0.9mm ± 0.1mm |
| Jacket diameter | 8.1 ± 0.3mm |
Electrical Characteristics
| Max. conductor DC resistance (20°C) | 7.98 Ω/km |
| Dielectric strength (insulation) | 2000V |
Mechanical Characteristics
| Operating temperature | -20°C ~ +200°C |
| Elongation at break | 150% |
| Tensile strength | 10N/mm² |
Fire Resistant Cable Shielded LSZH — 2×2.5mm² vs 2×1.5mm² vs 2×1.0mm²
| Feature | 2×2.5mm² (This cable) | 2×1.5mm² | 2×1.0mm² |
|---|---|---|---|
| Item # | HER25S2LZ | HER15S2LZ | HER10S2LZ |
| Conductor size (AWG) | 14 AWG | 16 AWG | 18 AWG |
| Conductor construction | 49/0.24mm | 30/0.24mm | 16/0.24mm |
| Insulation diameter | 3.1 ± 0.10 mm | 2.5 ± 0.10 mm | 2.1 ± 0.10 mm |
| Jacket diameter | 8.1 ± 0.3 mm | 6.7 ± 0.3 mm | 5.7 ± 0.3 mm |
| Max. conductor DC resistance | 7.98 Ω/km | 12.33 Ω/km | 21.4 Ω/km |
| Best for | Longer fire-alarm circuit runs, higher signaling current | Standard fire alarm and detector wiring | Compact detector/signaling loops, shorter runs |
Frequently Asked Questions
It is designed for fire alarm systems, signaling devices, and electronic equipment in indoor and residential installations, carrying power and signal to detectors, sounders, and control panels on life-safety circuits — the 14AWG conductor size is best suited to longer circuit runs and higher current draw within the shielded family.
Yes. A polyester tape + aluminum foil shield with drain wire covers the twisted pair at 100% coverage, protecting fire alarm and signaling circuits from electromagnetic interference that could otherwise trigger false alarms or signal loss.
The three variants share the same shielded, silicone-insulated, LSZH construction and differ only in conductor size. The 2×2.5mm² (14AWG) version suits longer circuit runs or higher current draw; the 2×1.5mm² (16AWG) is the standard choice for typical fire alarm and detector wiring; the 2×1.0mm² (18AWG) is the most compact choice for shorter detector and signaling loops.
Yes. It is manufactured and tested to IEC 60331-1, IEC 60332-1, EN 50200, EN 61034-2, BS 5839-1, and BS 6387, the standards commonly required for fire alarm and life-safety circuit integrity cables.
LSZH (Low Smoke Zero Halogen) jacketing limits flame spread and emits minimal toxic smoke and no halogen gases when burned, which is essential for fire alarm cabling routed through occupied buildings where visibility and air quality during a fire are critical.
Standard packaging is 500m per reel with continuous footage markers on the jacket, matching the 2×1.5mm² and 2×1.0mm² variants in this series. The cable is rated for a maximum voltage of 300V, in line with typical indoor fire-alarm and signaling circuits.
Every reel of Heizka Fire Resistant Cable Shielded, LSZH 2×2.5mm² ships as a continuous 500m length with clear footage markers printed along the jacket, ready to route directly into fire alarm control panels, detector loops, and signaling circuits without unnecessary splicing.
Heizka Cable — Designed in the USA, distributed in 20+ countries worldwide.
