The energy world turns its eyes to Munich: From May 7 to 9, Intersolar Europe – Europe's leading trade fair for solar energy – will take place there. Thousands of experts, manufacturers, and project developers will gather to discuss technologies, solutions, and trends in photovoltaics. Naturally, KLZ will be there.
Around Intersolar Europe, the topic of photovoltaics is once again moving into the spotlight. A great reason to take a closer look at a special solar cable developed specifically for use in PV systems – robust, weather-resistant, and compliant with current standards.
What lies behind the design, which selection criteria matter for solar cables, and why every detail counts in photovoltaic projects – that’s exactly what this article is about.
What is the H1Z2Z2-K 6mm² solar cable?
The H1Z2Z2-K 6mm² is a highly specialized, electron beam cross-linked solar cable developed for the specific demands of photovoltaic systems. In practice, that means: this cable transports the generated direct current (DC) from the solar module to the inverter – reliably, efficiently, and most importantly: safely.
Why 6mm²?
The 6mm² cross-section has proven to be particularly powerful and versatile in PV systems. It offers a great balance between current-carrying capacity and voltage drop – especially over longer cable runs, which is often the case in ground-mounted systems or more complex roof structures.
Construction and choice of materials
What makes the H1Z2Z2-K special is its material composition. This cable does not use traditional PVC insulation but instead halogen-free, flame-retardant, and cross-linked polyolefins. These offer:
High thermal resistance – even under direct sunlight
UV- and ozone-resistant outer sheath, ideal for open installation
Mechanical durability against abrasion, compression, and bending
More than just a cable
While standard cables quickly reach their limits under extreme temperatures, mechanical stress, or UV exposure, the H1Z2Z2-K 6mm² stays strong – for decades. It was specifically developed according to EN 50618 to meet the extreme conditions of photovoltaic systems – whether at 3,000 meters in the Alps or under 50 °C in the scorching sun of Southern Europe.
Application areas at a glance:
DC connection from solar modules to string boxes or inverters
Integration into storage systems
Use in rooftop, ground-mounted, and agri-PV installations
Suitable for indoor use, open installation, cable ducts, and underground installation
In short: the H1Z2Z2-K 6mm² is no off-the-shelf solution – it’s a specialized energy cable for an industry that doesn’t compromise.
Technical specifications and construction in detail
One of the strengths of this cable lies in its material structure and the resulting thermal and mechanical durability.
| Property | Value / Description |
|---|---|
| Conductor | Fine-stranded, tinned copper conductor (Class 5) |
| Rated voltage | 1500 V DC (compliant with EN 50618) |
| Test voltage | 6.5 kV |
| Operating temperature range | -40 °C to +90 °C (conductor max. +120 °C) |
| Insulation and sheath | Cross-linked polyolefin, halogen-free |
| Outer diameter (6mm²) | approx. 6.4 mm |
| Bending radius | min. 4 × cable diameter |
| Max. current capacity (free laid) | up to 70 A (depending on ambient temperature) |
Standards and certifications: EN 50618 & more
The H1Z2Z2-K 6mm² meets all key standards for use in photovoltaic systems. These standards ensure safety, durability, and compliance with legal requirements.
EN 50618 – European standard for solar cables
This standard defines technical requirements for materials, electrical characteristics, and mechanical resilience. It mandates:
Halogen-free, flame-retardant insulation
UV- and weather-resistant materials
Rated voltage up to 1500 V DC
Service life of over 25 years
TÜV 2 PfG 1169/08.2007
An additional quality inspection by TÜV Rheinland confirms:
Resistance to ozone and moisture
Long-term performance under real conditions
Thermal load capacity
CPR classification (Construction Products Regulation)
For building installations, fire behavior is crucial. The H1Z2Z2-K reaches B2ca or Cca depending on the variant:
Low smoke emission
Flame retardancy
No corrosive fire gases
Conclusion: The comprehensive compliance with standards makes the H1Z2Z2-K 6mm² a reliable and legally secure solution for all professional PV applications.
Areas of application: Where the H1Z2Z2-K 6mm² shows its strengths
Whether out in the open, in commercial buildings, or integrated into hybrid power plants – this cable delivers reliably.
Typical fields of application:
Ground-mounted solar parks
Industrial rooftops and carports
Agri-PV systems (e.g. above fields, animal barns)
Off-grid PV systems
Inverter connections
Storage systems and DC networks
The H1Z2Z2-K also proves its worth in special applications, such as near salty air zones or in environments with extreme temperature fluctuations.
Underground installation of PV cables – what to consider
One major advantage of the H1Z2Z2-K is its suitability for direct burial – without protective conduit. However, certain rules still apply:
Best practices for installation:
Bedding in sand or fine-grained material
Protection from sharp-edged stones by replacing with gravel
Installation with minimum spacing from other cables
Marking with warning tape 30 cm above the cable
Avoid tensile stress during installation
Important: For projects spanning several hundred meters, a voltage drop calculation is worthwhile – 6mm² isn’t always the best fit by default.
FAQ: The most frequently asked questions about H1Z2Z2-K solar cables
What does H1Z2Z2-K mean?
This designation refers to a cable type with specific insulation materials and properties according to EN 50618, suitable for DC voltage up to 1500 V.
Is the cable approved for underground installation?
Yes, including direct burial without additional protective conduits.
Which cross-sections are available?
Typically: 1.5 / 2.5 / 4 / 6 / 10 mm² – 6mm² is the proven all-rounder.
Why halogen-free?
No toxic fumes are released in the event of fire – ideal for sensitive building environments.
What is the maximum installation length for 6mm²?
Depends on current demand and voltage drop – often sensible between 30 m and 100 m.
Conclusion: Quality that makes the difference
The H1Z2Z2-K 6mm² stands for technical maturity and a consistent focus on professional use in photovoltaic systems. From high thermal and voltage resistance to verified compliance with standards – this cable combines everything today’s modern energy infrastructure demands.
What really stands out is its versatility: whether on rooftops, in underground installations, or in large-scale PV plants – the H1Z2Z2-K delivers reliability and an impressive service life. It makes a direct contribution to the economic efficiency and sustainability of solar systems.
Further information, technical details, and ordering options can be found on the product page: 👉 To the H1Z2Z2-K at KLZ
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