---
title: 'Securing the future with H1Z2Z2-K: Our solar cable for Intersolar 2025'
date: '2025-05-01T09:40:37'
featuredImage: /uploads/2025/04/inter-solar.webp
locale: en
category: Kabel Technologie
---
# Securing the future with H1Z2Z2-K: Our solar cable for Intersolar 2025
Around [Intersolar Europe](https://www.intersolar.de/start), 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.
<VisualLinkPreview 
url="
<VisualLinkPreview 
  url="https://youtu.be/YbtdyvQFoVM"
  title="Intersolar Europe 2025 | Save The Date | May 7–9, 2025"
  summary="As the world’s leading exhibition for the solar industry, Intersolar Europe demonstrates the enormous vitality of the solar market. For more than 30 years, i…"
  image="https://i.ytimg.com/vi/YbtdyvQFoVM/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGEQgSyhyMA8=&rs=AOn4CLBx90qdBxgYcyMttgdOGs3-m0udZQ"
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"
title="Intersolar Europe 2025 | Save The Date | May 7–9, 2025"
summary="As the world’s leading exhibition for the solar industry, Intersolar Europe demonstrates the enormous vitality of the solar market. For more than 30 years, i…"
image="https://i.ytimg.com/vi/YbtdyvQFoVM/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGEQgSyhyMA8=&amp;rs=AOn4CLBx90qdBxgYcyMttgdOGs3-m0udZQ"
/>
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.
<table>
<thead>
<tr>
<th>**Property**</th>
<th>**Value / Description**</th>
</tr>
</thead>
<tbody>
<tr>
<td>Conductor</td>
<td>Fine-stranded, tinned copper conductor (Class 5)</td>
</tr>
<tr>
<td>Rated voltage</td>
<td>1500 V DC (compliant with EN 50618)</td>
</tr>
<tr>
<td>Test voltage</td>
<td>6.5 kV</td>
</tr>
<tr>
<td>Operating temperature range</td>
<td>-40 °C to +90 °C (conductor max. +120 °C)</td>
</tr>
<tr>
<td>Insulation and sheath</td>
<td>Cross-linked polyolefin, halogen-free</td>
</tr>
<tr>
<td>Outer diameter (6mm²)</td>
<td>approx. 6.4 mm</td>
</tr>
<tr>
<td>Bending radius</td>
<td>min. 4 × cable diameter</td>
</tr>
<tr>
<td>Max. current capacity (free laid)</td>
<td>up to 70 A (depending on ambient temperature)</td>
</tr>
</tbody>
</table>
## Standards and certifications: EN 50618 &amp; 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.
<hr />
## 
## FAQ: The most frequently asked questions about H1Z2Z2-K solar cables
**What does H1Z2Z2-K mean?**<br />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?**<br />Yes, including direct burial without additional protective conduits.
**Which cross-sections are available?**<br />Typically: 1.5 / 2.5 / 4 / 6 / 10 mm² – 6mm² is the proven all-rounder.
**Why halogen-free?**<br />No toxic fumes are released in the event of fire – ideal for sensitive building environments.
**What is the maximum installation length for 6mm²?**<br />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](/products/solar-cables/h1z2z2-k/)
All the key details about Intersolar Europe can be found here:
<VisualLinkPreview 
url="
<VisualLinkPreview 
  url="https://www.intersolar.de/messe-kompakt?ref=m5f53a666f3a2cb2fee160554-s65eec4739108db093b003a02-t1746004197-cf3c592e7"
  title="Intersolar Europe at a Glance"
  summary="Intersolar Europe | Exhibition Quick Facts | Date, Venue, Opening Hours, Exhibitors"
  image="https://www.intersolar.de/media/image/6311c9ee98bbc414b66305e2/750"
/>
"
title="Intersolar Europe at a Glance"
summary="Intersolar Europe | Exhibition Quick Facts | Date, Venue, Opening Hours, Exhibitors"
image="https://www.intersolar.de/media/image/6311c9ee98bbc414b66305e2/750"
/>
