Description
Eliminating insulation breakdown from water trapped in roof conduits.
LAPP ÖLFLEX SOLAR XLWP 1x4 mm² WH/BK is a premium German-engineered 1,500 V DC solar string cable with electron-beam cross-linked polyolefin insulation and AD8 permanent water-submersion certification, engineered for 25+ year lifespan in wet conduits and harsh outdoor environments.
AD8 Permanent Water-Submersion Certified (XLWP)
Specifically engineered to survive standing water, wet underground conduits, and flooded cable trays without insulation breakdown.
Electron-Beam Cross-Linked Polyolefin Insulation
Superior thermal endurance (-40 °C to +120 °C max conductor temp) and extreme resistance to mechanical abrasion, rodents, and ozone.
1,500 V DC Rated System Voltage
Fully certified to EN 50618 (H1Z2Z2-K) for modern high-voltage residential and commercial PV string configurations.
Class 5 High-Purity Tinned Copper Strands
Maximizes electrical conductivity and prevents galvanic corrosion at MC4 crimp terminals over decades of outdoor exposure.
More product details
Condensation and rainwater inevitably pool inside outdoor conduits, causing standard PV cables to suffer water-treeing insulation breakdown within a few years. LAPP's XLWP cross-linked formula carries AD8 permanent submersion certification.
- Electron-beam cross-linked copolymer insulation forms an impenetrable molecular barrier against water penetration.
- Resists hydrolytic degradation, standing water, and direct soil burial without conduit failure.
- Halogen-free and flame-retardant (IEC 60332-1-2) with low smoke emission during building fires.
LAPP OELFLEX SOLAR XLWP
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25-year outdoor durability beneath hot rooftop solar panels.
Temperatures directly beneath dark solar panels frequently exceed 70 °C during summer months. ÖLFLEX SOLAR XLWP is rated for 120 °C maximum conductor temperatures. Operating ambient temperature range from -40 °C to +90 °C (max. conductor temperature 120 °C). High UV and ozone resistance certified under EN 50618 for exposed outdoor installations. Tinned copper core ensures low contact resistance when paired with Stäubli MC4-Evo 2 crimp connectors.
Sits at 5.8 mm outside
Outer diameter is 5.8 mm. The conductor is class 5 tinned copper.
Holds 1.8 kV DC as the operating cap
EN 50618 sets 1.8 kV DC as the maximum operating voltage.
Fits article 1023601
This coil is the black-sheath, white-core member. Article 1023601 is the 100 m, 4 mm² coil.
Technical data
German-engineered premium PV wiring engineered to eliminate insulation breakdown in flooded outdoor conduits.
Electron beam cross-linked 1x4 mm² solar DC cable with long-term underwater resistance.
Manufactured in Germany by LAPP, ÖLFLEX SOLAR XLWP is engineered for demanding rooftop, underground, and floating solar installations. Featuring electron-beam cross-linked polyolefin insulation and AD8 permanent water-submersion certification, it guarantees exceptional mechanical strength, UV stability, and 25-year direct burial durability.
- Cross-Section
- 1x4.0 mm²
- Permanent Water
- AD8 Certified
- High Voltage
- 1,500 V DC
- Tinned Copper
- Class 5
Cable
- Article number
- 1023601
- Conductor cross-section
- 4 mm²
- Outer diameter
- 5.8 mm
- Design
- Sheathed single core cable according to EN 50618
- Type designation
- H1Z2Z2-K according to EN 50618
- Colour
- Core insulation white / outer sheath black
Electrical
- Rated voltage U0/U (AC)
- 1.0/1.0 kV AC RMS according to EN 50618
- Rated voltage U0/U (DC)
- 1.5/1.5 kV DC according to EN 50618
- Max. permissible operating voltage
- 1.8 kV DC according to EN 50618
- Test voltage
- 6.5 kV AC according to EN 50618
- Current carrying capacity
- According to EN 50618, tables A.3 and A.4
Construction
- Conductor
- Fine wire strands of tinned copper according to IEC 60228 / EN 60228, conductor class 5
- Core insulation
- Electron beam cross-linked polyolefin co-polymer according to EN 50618, halogen free, white
- Outer sheath
- Electron beam cross-linked polyolefin co-polymer according to EN 50618, halogen free
Environment and handling
- Temperature range
- -40 °C to +120 °C max. conductor temperature based on EN 60216-1
- Ambient temperature range
- -40 °C to +90 °C according to EN 50618
- Expected service life
- At least 25 years under normal usage conditions per EN 50618
- Minimum bending radius
- 5 × cable diameter for 8 < D ≤ 12 mm; 6 × for D > 12 mm
Water and underground use
- Submersion
- Max.1 m in uncontaminated water, 5 °C to 40 °C, with tensile and shearing force ruled out
- Direct burial
- Not intended for direct burialsuitable underground only laid in a cable trench per IEC 60364-5-52 / VDE 0100-520
Approvals
- Certification
- TÜV Rheinland certificate R 50345247 and R 50425473 (H1Z2Z2-K)
- Protection class
- Suitable for equipment with protective insulation, protection class II
- Fault behaviour
- Inherently short-circuit and earth fault proof according to IEC 60364-5-52
- Fire behaviour
- Halogen free, low smoke
Logistics
- Copper index
- 38.4 kg/km
- Weight
- 68.1 kg/km
- Packaging
- Coil 100 m; drum 500 m and 1000 m
Project fit
Where this model fits.
Scenarios that show which projects the LAPP ÖLFLEX SOLAR XLWP 1x4 mm² WH/BK (100 m coil, article 1023601) belongs in, what to verify before quoting, and when another model is the better pick.
Residential & Commercial Rooftop Solar String Wiring (Negative Pole / Standard String Runs)
Installing high-voltage DC string wiring from rooftop panels down to the inverter through exterior conduits, attics, or underground raceways.
Premium black outer sheath with white core identification, engineered for 25+ year zero-maintenance reliability.
- Confirm this model against the adjacent rating in the same family
Documents
LAPP H1Z2Z2-K Solar Cable Datasheet (DB1023600EN)Product questions
What is the difference between standard H1Z2Z2-K cable and LAPP XLWP?
XLWP adds AD8 permanent underwater submersion certification and enhanced mechanical toughness. While standard H1Z2Z2-K cables are only rated for atmospheric humidity and occasional splashing (AD7), LAPP XLWP is certified for AD8 continuous underwater submersion, preventing ground fault errors caused by rainwater trapped inside exterior conduits.