---
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
---
# Securing the future with H1Z2Z2-K: Our solar cable for Intersolar 2025

<p class="" data-start="114" data-end="386">Around <a href="https://www.intersolar.de/start" target="_blank" rel="noopener noreferrer nofollow">Intersolar Europe</a>, 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.</p>
<div class="vlp-link-container vlp-layout-basic"><a href="https://youtu.be/YbtdyvQFoVM" class="vlp-link" title="Intersolar Europe 2025 | Save The Date | May 7–9, 2025" rel="nofollow" target="_blank"></a><div class="vlp-layout-zone-side"><div class="vlp-block-2 vlp-link-image"><img decoding="async" src="https://i.ytimg.com/vi/YbtdyvQFoVM/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGEQgSyhyMA8=&amp;rs=AOn4CLBx90qdBxgYcyMttgdOGs3-m0udZQ" style={{"maxWidth":"150px","maxHeight":"150px"}} /></div></div><div class="vlp-layout-zone-main"><div class="vlp-block-0 vlp-link-title">Intersolar Europe 2025 | Save The Date | May 7–9, 2025</div><div class="vlp-block-1 vlp-link-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…</div></div></div>
<p class="" data-start="388" data-end="575">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.</p>

<h2 class="" data-start="189" data-end="243">What is the H1Z2Z2-K 6mm² solar cable?</h2>
<p class="" data-start="245" data-end="568">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.</p>
<h3 class="" data-start="570" data-end="585">Why 6mm²?</h3>
<p class="" data-start="587" data-end="878">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.</p>
<h3 class="" data-start="880" data-end="907">Construction and choice of materials</h3>
<p class="" data-start="909" data-end="1111">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:</p>
<ul data-start="1113" data-end="1326">
<li class="" data-start="1113" data-end="1187">
<p class="" data-start="1115" data-end="1187"><strong data-start="1115" data-end="1148">High thermal resistance</strong> – even under direct sunlight</p>
</li>
<li class="" data-start="1188" data-end="1254">
<p class="" data-start="1190" data-end="1254"><strong data-start="1190" data-end="1226">UV- and ozone-resistant outer sheath</strong>, ideal for open installation</p>
</li>
<li class="" data-start="1255" data-end="1326">
<p class="" data-start="1257" data-end="1326"><strong data-start="1257" data-end="1289">Mechanical durability</strong> against abrasion, compression, and bending</p>
</li>
</ul>
<h3 class="" data-start="1328" data-end="1354">More than just a cable</h3>
<p class="" data-start="1356" data-end="1749">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.</p>
<h3 class="" data-start="1751" data-end="1790">Application areas at a glance:</h3>
<ul data-start="1792" data-end="2038">
<li class="" data-start="1792" data-end="1864">
<p class="" data-start="1794" data-end="1864"><strong data-start="1794" data-end="1864">DC connection from solar modules to string boxes or inverters</strong></p>
</li>
<li class="" data-start="1865" data-end="1901">
<p class="" data-start="1867" data-end="1901"><strong data-start="1867" data-end="1901">Integration into storage systems</strong></p>
</li>
<li class="" data-start="1902" data-end="1961">
<p class="" data-start="1904" data-end="1961"><strong data-start="1904" data-end="1961">Use in rooftop, ground-mounted, and agri-PV installations</strong></p>
</li>
<li class="" data-start="1962" data-end="2038">
<p class="" data-start="1964" data-end="2038"><strong data-start="1964" data-end="2038">Suitable for indoor use, open installation, cable ducts, and underground installation</strong></p>
</li>
</ul>
<p class="" data-start="2040" data-end="2191">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.</p>

<h2 class="" data-start="1586" data-end="1629">Technical specifications and construction in detail</h2>
<p class="" data-start="1631" data-end="1766">One of the strengths of this cable lies in its material structure and the resulting thermal and mechanical durability.</p>
<div class="group pointer-events-none relative flex justify-center *:pointer-events-auto">
<div class="tableContainer horzScrollShadows relative">
<table class="min-w-full" data-start="1768" data-end="2556">
<thead data-start="1768" data-end="1846">
<tr data-start="1768" data-end="1846">
<th data-start="1768" data-end="1801"><strong data-start="1770" data-end="1785">Property</strong></th>
<th data-start="1801" data-end="1846"><strong data-start="1803" data-end="1826">Value / Description</strong></th>
</tr>
</thead>
<tbody data-start="1925" data-end="2556">
<tr data-start="1925" data-end="2010">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="1925" data-end="1957">Conductor</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)] min-w-[calc(var(--thread-content-max-width)/3)]" data-start="1957" data-end="2010">Fine-stranded, tinned copper conductor (Class 5)</td>
</tr>
<tr data-start="2011" data-end="2087">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2011" data-end="2043">Rated voltage</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2043" data-end="2087">1500 V DC (compliant with EN 50618)</td>
</tr>
<tr data-start="2088" data-end="2164">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2088" data-end="2120">Test voltage</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2120" data-end="2164">6.5 kV</td>
</tr>
<tr data-start="2165" data-end="2241">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2165" data-end="2197">Operating temperature range</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2197" data-end="2241">-40 °C to +90 °C (conductor max. +120 °C)</td>
</tr>
<tr data-start="2242" data-end="2318">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2242" data-end="2274">Insulation and sheath</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2274" data-end="2318">Cross-linked polyolefin, halogen-free</td>
</tr>
<tr data-start="2319" data-end="2395">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2319" data-end="2351">Outer diameter (6mm²)</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2351" data-end="2395">approx. 6.4 mm</td>
</tr>
<tr data-start="2396" data-end="2472">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2396" data-end="2428">Bending radius</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2428" data-end="2472">min. 4 × cable diameter</td>
</tr>
<tr data-start="2473" data-end="2556">
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2473" data-end="2514">Max. current capacity (free laid)</td>
<td class="max-w-[calc(var(--thread-content-max-width)*2/3)]" data-start="2514" data-end="2556">up to 70 A (depending on ambient temperature)</td>
</tr>
</tbody>
</table>
</div>
</div>

<h2 class="" data-start="121" data-end="170">Standards and certifications: EN 50618 &amp; more</h2>
<p class="" data-start="172" data-end="359">The H1Z2Z2-K 6mm² meets all key standards for use in photovoltaic systems. These standards ensure safety, durability, and compliance with legal requirements.</p>
<h3 class="" data-start="361" data-end="414">EN 50618 – European standard for solar cables</h3>
<p class="" data-start="415" data-end="559">This standard defines technical requirements for materials, electrical characteristics, and mechanical resilience. It mandates:</p>
<ul data-start="560" data-end="705">
<li class="" data-start="560" data-end="598">
<p class="" data-start="562" data-end="598">Halogen-free, flame-retardant insulation</p>
</li>
<li class="" data-start="599" data-end="641">
<p class="" data-start="601" data-end="641">UV- and weather-resistant materials</p>
</li>
<li class="" data-start="642" data-end="670">
<p class="" data-start="644" data-end="670">Rated voltage up to 1500 V DC</p>
</li>
<li class="" data-start="671" data-end="705">
<p class="" data-start="673" data-end="705">Service life of over 25 years</p>
</li>
</ul>
<h3 class="" data-start="707" data-end="735">TÜV 2 PfG 1169/08.2007</h3>
<p class="" data-start="736" data-end="804">An additional quality inspection by TÜV Rheinland confirms:</p>
<ul data-start="805" data-end="924">
<li class="" data-start="805" data-end="852">
<p class="" data-start="807" data-end="852">Resistance to ozone and moisture</p>
</li>
<li class="" data-start="853" data-end="897">
<p class="" data-start="855" data-end="897">Long-term performance under real conditions</p>
</li>
<li class="" data-start="898" data-end="924">
<p class="" data-start="900" data-end="924">Thermal load capacity</p>
</li>
</ul>
<h3 class="" data-start="926" data-end="960">CPR classification (Construction Products Regulation)</h3>
<p class="" data-start="961" data-end="1079">For building installations, fire behavior is crucial. The H1Z2Z2-K reaches B2ca or Cca depending on the variant:</p>
<ul data-start="1080" data-end="1152">
<li class="" data-start="1080" data-end="1106">
<p class="" data-start="1082" data-end="1106">Low smoke emission</p>
</li>
<li class="" data-start="1107" data-end="1123">
<p class="" data-start="1109" data-end="1123">Flame retardancy</p>
</li>
<li class="" data-start="1124" data-end="1152">
<p class="" data-start="1126" data-end="1152">No corrosive fire gases</p>
</li>
</ul>
<p class="" data-start="1154" data-end="1309">Conclusion: The comprehensive compliance with standards makes the H1Z2Z2-K 6mm² a reliable and legally secure solution for all professional PV applications.</p>

<h2 class="" data-start="3171" data-end="3238">Areas of application: Where the H1Z2Z2-K 6mm² shows its strengths</h2>
<p class="" data-start="3240" data-end="3352">Whether out in the open, in commercial buildings, or integrated into hybrid power plants – this cable delivers reliably.</p>
<h3 class="" data-start="3354" data-end="3384">Typical fields of application:</h3>
<ul data-start="3385" data-end="3592">
<li class="" data-start="3385" data-end="3413">
<p class="" data-start="3387" data-end="3413">Ground-mounted solar parks</p>
</li>
<li class="" data-start="3414" data-end="3448">
<p class="" data-start="3416" data-end="3448">Industrial rooftops and carports</p>
</li>
<li class="" data-start="3449" data-end="3504">
<p class="" data-start="3451" data-end="3504">Agri-PV systems (e.g. above fields, animal barns)</p>
</li>
<li class="" data-start="3505" data-end="3526">
<p class="" data-start="3507" data-end="3526">Off-grid PV systems</p>
</li>
<li class="" data-start="3527" data-end="3557">
<p class="" data-start="3529" data-end="3557">Inverter connections</p>
</li>
<li class="" data-start="3558" data-end="3592">
<p class="" data-start="3560" data-end="3592">Storage systems and DC networks</p>
</li>
</ul>
<p class="" data-start="3594" data-end="3767">The H1Z2Z2-K also proves its worth in special applications, such as near salty air zones or in environments with extreme temperature fluctuations.</p>

<h2 class="" data-start="3774" data-end="3828">Underground installation of PV cables – what to consider</h2>
<p class="" data-start="3830" data-end="3959">One major advantage of the H1Z2Z2-K is its suitability for direct burial – without protective conduit. However, certain rules still apply:</p>
<h3 class="" data-start="3961" data-end="3998">Best practices for installation:</h3>
<ul data-start="3999" data-end="4282">
<li class="" data-start="3999" data-end="4047">
<p class="" data-start="4001" data-end="4047">Bedding in sand or fine-grained material</p>
</li>
<li class="" data-start="4048" data-end="4107">
<p class="" data-start="4050" data-end="4107">Protection from sharp-edged stones by replacing with gravel</p>
</li>
<li class="" data-start="4108" data-end="4163">
<p class="" data-start="4110" data-end="4163">Installation with minimum spacing from other cables</p>
</li>
<li class="" data-start="4164" data-end="4219">
<p class="" data-start="4166" data-end="4219">Marking with warning tape 30 cm above the cable</p>
</li>
<li class="" data-start="4220" data-end="4282">
<p class="" data-start="4222" data-end="4282">Avoid tensile stress during installation</p>
</li>
</ul>
<p class="" data-start="4284" data-end="4430"><strong data-start="4284" data-end="4296">Important:</strong> For projects spanning several hundred meters, a voltage drop calculation is worthwhile – 6mm² isn’t always the best fit by default.</p>
<hr class="" data-start="4432" data-end="4435" />
<h2 class="" data-start="4437" data-end="4497"></h2>

<h2 class="" data-start="4437" data-end="4497">FAQ: The most frequently asked questions about H1Z2Z2-K solar cables</h2>
<p class="" data-start="4499" data-end="4669"><strong data-start="4499" data-end="4525">What does H1Z2Z2-K mean?</strong><br data-start="4525" data-end="4528" />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.</p>
<p class="" data-start="4671" data-end="4785"><strong data-start="4671" data-end="4717">Is the cable approved for underground installation?</strong><br data-start="4717" data-end="4720" />Yes, including direct burial without additional protective conduits.</p>
<p class="" data-start="4787" data-end="4908"><strong data-start="4787" data-end="4827">Which cross-sections are available?</strong><br data-start="4827" data-end="4830" />Typically: 1.5 / 2.5 / 4 / 6 / 10 mm² – 6mm² is the proven all-rounder.</p>
<p class="" data-start="4910" data-end="5019"><strong data-start="4910" data-end="4932">Why halogen-free?</strong><br data-start="4932" data-end="4935" />No toxic fumes are released in the event of fire – ideal for sensitive building environments.</p>
<p class="" data-start="5021" data-end="5159"><strong data-start="5021" data-end="5074">What is the maximum installation length for 6mm²?</strong><br data-start="5074" data-end="5077" />Depends on current demand and voltage drop – often sensible between 30 m and 100 m.</p>

<h2 class="" data-start="200" data-end="248">Conclusion: Quality that makes the difference</h2>
<p class="" data-start="250" data-end="546">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.</p>
<p class="" data-start="548" data-end="837">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.</p>
<p class="" data-start="839" data-end="932">Further information, technical details, and ordering options can be found on the product page: 👉 <a class="" href="/products/solar-cables/h1z2z2-k/" target="_new" rel="noopener" data-start="937" data-end="1023">To the H1Z2Z2-K at KLZ</a></p>
<p class="" data-start="839" data-end="932">All the key details about Intersolar Europe can be found here:</p>
<div class="vlp-link-container vlp-layout-basic"><a href="https://www.intersolar.de/messe-kompakt?ref=m5f53a666f3a2cb2fee160554-s65eec4739108db093b003a02-t1746004197-cf3c592e7" class="vlp-link" title="Intersolar Europe at a Glance" rel="nofollow" target="_blank"></a><div class="vlp-layout-zone-side"><div class="vlp-block-2 vlp-link-image"><img decoding="async" src="https://www.intersolar.de/media/image/6311c9ee98bbc414b66305e2/750" style={{"maxWidth":"150px","maxHeight":"150px"}} /></div></div><div class="vlp-layout-zone-main"><div class="vlp-block-0 vlp-link-title">Intersolar Europe at a Glance</div><div class="vlp-block-1 vlp-link-summary">Intersolar Europe | Exhibition Quick Facts | Date, Venue, Opening Hours, Exhibitors</div></div></div>
