LSZH Fire Resistant Cable

This LSZH fire-resistant cable is designed for fixed low-voltage installations requiring a single integrated cable assembly with a 3+2 configuration: three phase conductors, one neutral, and one earth. A representative model is WDZB2N-YJY 0.6/1kV 3×25mm² + 2×16mm², commonly specified for switchboard interconnections, vertical risers, protected trunking, service shafts, and enclosed supply feeders-where the routing environment itself becomes a key selection criterion.

Rail transit systems

In confined, high-occupancy environments like metro networks, light-rail lines, and high-speed train corridors, adoption of these cables substantially raises the overall fire-protection standard, reducing risk exposure in underground or tunnel-based infrastructure.

Data centers & telecom facilities

Designed to sustain network connectivity and power delivery during the early phases of a fire incident, these cables help safeguard critical data streams and keep emergency communication systems online when they are most needed.

High-rise buildings & healthcare facilities

Installed along essential vertical routes such as elevator risers and main power distribution shafts, this cabling solution contributes to a higher margin of fire safety across multistory structures and medical complexes.

Petrochemical sites & airports

In locations where safety protocols and environmental criteria are exceptionally stringent, fire-resistant LSZH cables deliver a dual advantage-combining flame retardancy with eco-friendly performance-making them a preferred option for these high-stakes settings.

Continuous thermal rating – Maximum sustained conductor temperature is typically 90°C for standard duty cycles.

Voltage range – Rated nominal voltages generally fall between 300/500V and 0.6/1kV, with the exact level depending on whether the cable serves control functions or primary power distribution.

Installation environment – Particularly suited to confined, low-ventilation, or densely occupied areas-including server rooms, aviation terminals, medical complexes, and underground rail corridors.

Circuit retention (FE180) – Products qualifying under IEC 60331-21 can sustain electrical conduction for up to 180 minutes under direct flame attack.

Combined stress tolerance (PH120) – Higher-grade variants rated to PH120 continue supplying essential safety circuits for 120 minutes while simultaneously withstanding fire, physical impacts, and water spray.

Flame containment (E30–E90) – Fire propagation is effectively restricted to a compact zone. Installations tested to DIN 4102-12 (classes E30 through E90) ensure that the full system remains operational for evacuation and firefighting activities over a 30-to-90-minute window.

Emission profile – Generates only low-density white smoke to preserve visibility, and releases no corrosive or poisonous halogenated compounds (such as chlorine or fluorine) during combustion.

Superior circuit integrity under fire – Designed to withstand high temperatures or direct flame exposure, this cable maintains electrical continuity for a defined duration, complying with IEC 60331 and related international norms. This ensures that essential systems stay operational during emergencies.

Minimal smoke generation – Dense smoke is a primary hazard during fires, often causing disorientation and hampering escape. This cable formulation produces very little smoke upon combustion, with low optical density, thereby improving visibility and facilitating safer emergency egress.

Halogen-free & environmentally safe – Unlike conventional PVC-insulated cables, which emit corrosive and toxic gases such as hydrogen chloride when burned, this product contains no halogens. It therefore releases no acidic or poisonous fumes, aligning with green building codes and stringent material safety requirements.

Robust mechanical & electrical performance – Beyond its fire-resistant and eco-friendly attributes, this cable offers strong resistance to mechanical shock, abrasion, and aging, alongside superior dielectric properties. These characteristics make it well suited for demanding or harsh operating environments.

Finished product + wooden barrel packaging

Rated voltages – Available in 450/750 V or 0.6/1 kV grades, with certain variants supporting up to 600/1000 V.

Conductor material – Manufactured from plain annealed copper, offered either as solid wire or stranded constructions conforming to class 2 or class 5 flexibility standards.

Fire-protective layer & dielectric – A mica-glass tape, applied directly over the conductor, serves as the primary fire barrier. This is combined with insulation materials such as cross-linked polyethylene (XLPE), silicone rubber, or thermosetting LSZH compounds.

External sheath – Constructed from low smoke zero halogen (LSZH) materials, available in either thermoplastic or thermosetting formulations. Common sheath colors include red, orange, and black for easy identification.

Thermal limits – Continuous service temperature spans from –40°C to +105°C, whilst installation handling is generally permitted between –5°C and +75°C.