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LSZH Compliance

LSZH Compliance

Low-Smoke Zero-Halogen (LSZH) compliance in the construction & infrastructure industry

Modern buildings, tunnels, stations and data centres are packed with copper and fibre that must carry power or data long after an emergency starts—yet must not feed the flames or fill escape routes with corrosive, blinding fumes.  LSZH (also written LSFH, LS0H or FRNC) technology addresses that need by replacing PVC and other halogenated polymers with highly-filled polyolefins that generate < 0.5 % hydrogen-halide acid and only a thin, translucent smoke when they burn. 

LSZH compliance

1. What “LSZH-compliant” really means
A cable may advertise “LSZH” only after it passes all three reaction-to-fire tests below:
Property International test & limit Why it matters
Halogen acid gas IEC/EN 60754-1 ≤ 0.5 % HCl by mass; IEC/EN 60754-2
pH ≥ 4.3 & conductivity ≤ 10 µS mm⁻¹ 		Prevents toxic, corrosive fumes that attack lungs, steel
and electronics. Eland Cables
Smoke density IEC/EN 61034-2 ≥ 60 % light transmission in the 3 m cube Maintains visibility in corridors and plantrooms.
ecatalog.corning.com
Flame spread IEC 60332-1-2 (single cable) and -3-24/25 Cat. C or A
for bunched cables 		Stops fire running along containment systems.
ecatalog.corning.com

Because “LSZH” is chemistry-centric, every region then adds a building-code layer that scores how the finished cable behaves in a furnace.  In the EU that layer is the Construction Products Regulation (CPR).

2. EU CPR Euroclasses—how LSZH ties in
Under EN 50575 / EN 13501-6 every fixed cable sold for construction works must carry a Euroclass label:
Euroclass Heat release (HRR) Typical LSZH target Smoke / droplet / acidity suffix*
B2ca Very low HRR Backbone fibre, safety circuits in public buildings s1a d1 a1 (low smoke, no flaming droplets, acid-free)
Cca Low HRR General power & data in commercial premises s1 d1 a1
Dca / Eca Medium / basic PVC  or PVC-LSF blends –

*Suffix format: s (smoke), d (droplets), a (acidity).  Example: B2ca-s1a,d1,a1 = best-in-class LSZH. 

System 1+ Euroclasses (Aca–Cca & B2ca) also impose annual factory audits and random fire tests, so specifiers should demand the manufacturer’s Declaration of Performance (DoP) number on every drum.

3. Beyond CPR—sector-specific LSZH mandates
Vertical Rule or spec that calls up LSZH Example requirement
Rail & metro EN 45545-2 (EU), NFPA 130 (US) HL1-HL3 / R22-R24 materials must be halogen-free, low smoke
and self-extinguishing. Sab CableSAB Cable
London Underground LU Std 1-085 “Flammability, smoke & fume” Zero-halogen cables only; additional “flaming-debris”
test. Power and Cables
Road tunnels & stations NFPA 502, national tunnel codes LSZH control and comms cables for ventilation, lighting,
SCADA loops. na.prysmian.com
Data centres TIA-942-B “fire safety” note† Halogen-free recommended in white-space
and UPS rooms.
Hospitals & airports Local fire orders + insurer clauses B2ca-s1a,d1,a1 LSZH for essential services.
†TIA-942 references ISO/IEC and NFPA guidance rather than imposing a prescriptive class.

4. How LSZH cables are built for buildings & infrastructure
Layer Preferred materials Contribution to compliance
Conductor Solid Cu (class 1/2) or fine-stranded Cu (class 5) Unaffected by LSZH chemistry; easy to terminate.
Insulation XLPE, XLPO, HFFR polyolefin Thermoset char limits flame & smoke; halogen-free
backbone.
Screen / armour Al/poly foil + tinned-Cu braid; steel wire armour for
power 		Maintains EMC and impact protection without PVC
bedding.
Outer sheath HFFR LSZH for indoor; LSZH-PUR blends for UV &
oil-exposed rail/tunnel runs 		< 0.1 % halogen, Limiting Oxygen Index ≥ 30 %. UL Solutions

The key is high mineral-hydroxide filler (ATH or MDH).  At ≈65 wt % the compound releases water at 200 °C, cooling the flame while the polymer chars rather than drips, so heat-release stays inside the B2/Cca envelope. 

5. LSZH product families you will meet on site
Family Euroclass options Typical application
RZ1-K / NHXH enhanced LSZH power B2ca-s1a,d1,a1 (≤ 240 mm²) UPS, fire pumps, riser feeds (≤ 1 kV) topcable.com
Fire-resistant LSZH (NHXH FE180/PH120) B2ca + PH60/PH120 Alarm, emergency lighting, voice evac—keeps working 120 min.
Backbone fibre, Cat-6A & SPE B2ca-s1a,d1,a1 10 Gb/s risers, FTTH riser cables, PoE++ CCTV Belden
Railway SABIX®, Belden rail-Ethernet EN 45545-2 HL1-3 + NFPA 130 Passenger coaches, wayside signalling Sab CableBelden
Tunnel “TSF” control cable NFPA 502 / LU 1-085 Vent-fan motors, PLC loops in road/metro tunnels.

6. Specifying LSZH in five steps
  • Choose the code first – CPR Euroclass for buildings; EN 45545-2 or NFPA 130 for rail; NFPA 502 for road tunnels.
  • Pair reaction-to-fire with circuit role – e.g., B2ca-s1a,d1,a1 + PH120 for an evacuation voice loop.
  • Inspect the DoP – verify Euroclass, smoke and acidity, plus factory number and System 1+ notified-body stamp (NB xxxx).
  • Check installation ecosystem – glands, clips, trunking must also be LSZH and fire-rated; avoid PVC ties on escape routes.
  • Document traceability – record drum batch, DoP and fire test report; many clients now require QR or BIM object links.

7. Emerging LSZH trends (2025-2028)
  • Nanoclay-reinforced HFFR—raises Limiting Oxygen Index to >35 % without extra weight, enabling B1ca grades in larger cross-sections.
  • Bio-sourced polyolefins—sugar-cane based LSZH jackets cut embodied CO₂ by ~20 % and still meet B2ca.
  • Hybrid “power + fibre” LSZH cables—4 × power cores + 12-fibre tube under one B2ca jacket for smart-building risers.
  • SPE (Single-Pair Ethernet) with PoDL—LSZH 18 AWG pairs carry 10 Mb/s + 50 W to sensors up to 1 km; B2ca samples already certified.
  • Digital declarations—CE mark QR codes link directly to the notified-body fire-test video and System 1+ audit dates for inspectors.

Conclusion

LSZH compliance is not just a material claim; it is a stack of chemical, smoke and heat-release tests (IEC 60754 & 61034, IEC 60332) tied to project-specific regulations such as EU CPR Euroclasses, EN 45545-2 or NFPA 130.  By demanding the right Euroclass suffix, inspecting the manufacturer’s Declaration of Performance, and matching cable families—power, data, fire-resistant—to their installation zones, designers can ensure that the critical wiring in buildings, tunnels and transport infrastructure will protect occupants, preserve equipment and satisfy regulators when every second counts.