Description
Permanent color coding for fast, error-free string terminations.
LAPP ÖLFLEX SOLAR XLWP 1x4 mm² WH/BK-RD is a premium German-engineered 1,500 V DC solar string cable with an integrated co-extruded red stripe for permanent positive DC polarity identification, featuring electron-beam cross-linked polyolefin insulation and AD8 permanent water-submersion certification.
Co-Extruded Red Stripe for Polarity Identification
Eliminates string polarity cross-connection errors during fast rooftop wiring and inverter DC commissioning.
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.
More product details
Flagging DC string polarity with colored electrical tape often leads to catastrophic reverse-polarity errors when tape fades or falls off in sunlight. The XLWP WH/BK-RD incorporates a permanent co-extruded red stripe into the outer polymer sheath.
- Co-extruded red stripe remains visible over 25+ years of outdoor sunlight and rain exposure.
- Clearly identifies positive DC string runs from roof arrays down to combiner boxes and inverters.
- Eliminates reverse-polarity connection risks that can destroy inverter MPPT input stages.
LAPP OELFLEX SOLAR XLWP
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Eliminating insulation breakdown from water trapped in roof conduits.
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.
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 the same voltage window as the black-sheath coil.
Fits the red-stripe polarity run
This coil is article 1023621. The sheath is black with a red stripe.
Technical data
German-engineered premium PV wiring with co-extruded color coding to eliminate on-site polarity errors.
1x4 mm² waterproof solar DC cable with distinct red stripe for permanent polarity identification.
Designed for clean, error-free solar array wiring, this LAPP ÖLFLEX SOLAR XLWP cable features an integrated co-extruded red stripe along the black outer sheath for permanent positive DC line identification. It features AD8 permanent water-resistance and electron-beam cross-linked insulation, ensuring multi-decade reliability in harsh outdoor environments.
- Polarity Coding
- Red Stripe
- Permanent Water
- AD8 Certified
- High Voltage
- 1,500 V DC
- Tinned Copper
- Class 5
Cable
- Article number
- 1023621
- 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 with red stripe
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-RD (100 m coil, article 1023621) belongs in, what to verify before quoting, and when another model is the better pick.
Positive DC String Wiring for Residential & Commercial Solar Arrays
Installing positive (+) DC string runs from rooftop solar modules down to the inverter through exterior conduits or attics.
Red-striped black sheath provides immediate visual confirmation of positive polarity during termination.
- Confirm this model against the adjacent rating in the same family
Documents
LAPP H1Z2Z2-K Solar Cable Datasheet (DB1023600EN)Product questions
Is the red stripe just painted on the surface?
No. The red stripe is co-extruded directly into the polymer during cable manufacturing. Co-extrusion means the red plastic is fused into the black outer sheath at the molecular level, making it impossible to scrape off, peel, or fade away under 25 years of intense UV radiation.