LSZH / HFFR Single Core Wire
LSZH is a categorically different product from FR-LSH. It contains absolutely zero halogen in the compound. In a fire, it produces negligible smoke and zero corrosive acid gas. Mandated for metro rolling stock, nuclear facilities, data centres, and any environment where secondary chemical damage from combustion is unacceptable.
Dimensional and Electrical Data
National Cables holds the BIS License for IS 17048:2018 up to 10mm². This ensures full regulatory compliance for residential and commercial infrastructure. For industrial projects requiring larger cross-sections (up to 240mm²), we manufacture custom OEM solutions to the same HFFR safety standards.
| Cross Section (mm²) | Nominal Insulation Thickness (mm) | Approx. OD (mm) | Current — In Conduit 2-cable 1φ (A) | Current — In Conduit 3-cable 3φ (A) | Current — Clipped Direct 1φ (A) | Current — Clipped Direct 3φ (A) | Current — Open Air / Tray 1-cable (A) | Max DC Resistance @ 20°C (Ω/km) |
|---|---|---|---|---|---|---|---|---|
| ISI Certified Range (IS 17048:2018) | ||||||||
| 0.5 | 0.6 | 2.6 | 4 | — | 6 | — | — | 39.0 |
| 0.75 | 0.6 | 2.8 | 7 | — | 10 | — | — | 26.0 |
| 1.0 | 0.6 | 3.0 | 11 | — | 14 | — | — | 19.5 |
| 1.5 | 0.6 | 2.9 | 13 | 11 | 17 | 15 | 22 | 13.3 |
| 2.5 | 0.7 | 4.1 | 18 | 16 | 23 | 20 | 30 | 7.98 |
| 4.0 | 0.8 | 4.8 | 24 | 21 | 31 | 27 | 40 | 4.95 |
| 6.0 | 0.8 | 5.3 | 31 | 27 | 40 | 35 | 51 | 3.30 |
| 10.0 | 1.0 | 7.0 | 42 | 37 | 54 | 47 | 70 | 1.91 |
| Dimensional data per IS 17048:2018 up to 10mm². Current ratings at 30°C ambient. Sizes above 10mm² available for custom OEM orders to non-ISI specifications. | ||||||||
Correct Current Ratings for Your Installation Temperature.
HFFR 90°C compound performs better than PVC at elevated ambient temperatures. Apply these factors for installations above 30°C ambient.
Thermoplastic HFFR Compounding.
Unlike standard wires that use Polyvinyl Chloride (PVC), LSZH wire is extruded with a Halogen-Free Flame Retardant (HFFR) compound. It contains absolutely zero chlorine, fluorine, or bromine. National Cables ensures the consistency of this compound to guarantee zero-halogen properties on every drum.
The Highest Fire Safety Specification Globally.
These properties are tested and documented per IS 17048:2018 and strict IEC guidelines on every production lot. This is exact-specification engineering.
Where This Wire is Specified.
LSZH is the cable of last resort for life safety — mandated for underground transport, defence installations, and environments where a fire event cannot be allowed to cause secondary chemical damage.
Standards This Product is Manufactured To.
National Cables LSZH Single Core Wire is manufactured to IS 17048:2018. This is the highest fire safety specification available for single core fixed installation wiring in India. Full documentation available for export requirements.
LSZH / HFFR wire — technical questions answered.
Common questions from metro rail specifiers, data centre procurement teams, airport MEP consultants, and fire safety engineers specifying halogen-free cable to IS 17048:2018.
What is the difference between LSZH and HFFR cables?
LSZH (Low Smoke Zero Halogen) and HFFR (Halogen Free Flame Retardant) describe essentially the same cable category using different terminology. LSZH is the more common international term, while HFFR is the formal designation used in Indian Standards.
IS 17048:2018 covers HFFR cables up to 1100V, including both 70°C thermoplastic and 90°C crosslinked compounds. Both terms refer to cables whose insulation contains zero halogen (no chlorine, fluorine, or bromine) and emits minimal smoke and acid gas during combustion.
National Cables manufactures HFFR cable under BIS licence CM/L-8800227819 for IS 17048:2018.
Why is IS 17048:2018 required for modern public infrastructure?
IS 17048:2018 is the Indian Standard specifically for HFFR cables and is regulated under the Cables (Quality Control) Order 2020 issued by the DPIIT — making compliance mandatory for manufacturing, import, and sale of HFFR cables in India.
Public infrastructure such as metro systems, airports, hospitals, tunnels, and data centres concentrates people and equipment in enclosed spaces where halogen acid gas and dense smoke from standard PVC would be lethal. IS 17048:2018 ensures strict limits on flame propagation, smoke density, and zero halogen emission to protect life and sensitive infrastructure.
What is the difference between zero halogen and low halogen?
Zero halogen cables (LSZH / HFFR to IS 17048:2018) use polyolefin compounds containing no chlorine, fluorine, or bromine. Halogen acid gas emission must be less than 0.5% tested per IEC 60754-1, with pH greater than 4.3 per IEC 60754-2.
Low halogen cables (FR-LSH to IS 694:2010) still use PVC-based compounds with halogen content reduced through formulation additives, typically permitting HCl emission up to around 20%.
In the Indian regulatory framework, zero-halogen falls under IS 17048:2018 and low-halogen under IS 694:2010 FR-LSH category.
Does LSZH cable have the same current-carrying capacity as PVC?
Not exactly — it depends on the specific HFFR compound. IS 17048:2018 covers both 70°C thermoplastic (HFI-TP 70) and 90°C crosslinked (HFI-XL 90) compounds.
The 90°C rated HFFR variants often permit higher current capacity than 70°C PVC (IS 694:2010) at the same conductor size, because the thermal headroom allows more heat dissipation before insulation limits are reached.
Exact current ratings depend on conductor size, installation method, ambient temperature, and grouping factors — always reference the manufacturer's technical datasheet for your specific installation conditions.
Request institutional pricing and technical documentation.
Our engineering team responds within 24 hours with accurate bulk pricing, complete compliance documentation, and specifications. BOQ uploads accepted.
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Supplying to an International Project?
This wire is manufactured to IS 17048:2018 on a BIS-certified halogen-free production line. The same facility produces cable conforming to the equivalent international LSZH standard — if your project specifies H07Z-K / EN 50525-3-41, we can supply from the same certified manufacturing facility.