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IEC 62930 vs. EN 50618: Understanding the Two Pillars of Solar Cable Certification
A practical comparison of the two global solar cable standards—what they cover, how they differ, which markets accept which, and how to verify genuine certification.
1. Introduction: One Cable, Two Standards
If you're sourcing solar cables for a project that could go to Europe, the Middle East, or Asia, you've probably run into this question: should I specify IEC 62930 or EN 50618?
The short answer is that the two standards are closely aligned—they share most of the same test methods, the same voltage rating, and the same 25-year design life. But they're not identical. And the differences, while subtle, can affect procurement decisions depending on where your project is located and what local regulations require.
Here's the thing: EN 50618 is the European harmonized standard. If your cable is going into an EU project, this is what inspectors look for. IEC 62930 is the international standard. It's recognized across more geographies but is less prescriptive in a few important areas. Many manufacturers—Sorivo included—certify their cables to both, so you don't have to choose. But understanding what each standard actually requires helps you evaluate whether a single-certificate cable meets your project's needs.
2. Where the Standards Come From
Both standards cover the same thing: single-core, cross-linked, insulated cables for DC circuits in photovoltaic systems, rated up to 1.5 kV DC. But they originate from different bodies.
| Standard | Issuing Body | First Published | Scope |
|---|---|---|---|
| EN 50618:2014 | CENELEC (European Committee for Electrotechnical Standardization) | 2014 | European harmonized standard for PV cables |
| IEC 62930:2017 | IEC (International Electrotechnical Commission) | 2017 | International standard for PV cables, 1.5 kV DC |
EN 50618 came first (2014), developed as Europe's dedicated solar cable standard. IEC 62930 followed in 2017, drawing heavily from EN 50618 but adapted for global adoption. The IEC version allows a bit more flexibility in material choices while maintaining equivalent core performance requirements.
3. Key Technical Differences
When you put the two standards side by side, the core test requirements are nearly identical. But there are four meaningful differences worth understanding.
3.1 Halogen-Free Requirement
This is the single biggest difference. EN 50618 mandates halogen-free (LSZH) construction. Every cable must pass the halogen content test per IEC 60754-1/2 and the smoke density test per IEC 61034-2. IEC 62930 permits both halogen-free and halogen-containing cables. The standard assigns four type designations: 62930 IEC 131 (Class 5, halogen-free), 132 (Class 2, halogen-free), 133 (Class 5, halogen-containing), and 134 (Class 2, halogen-containing). The most common for solar applications is 62930 IEC 131.
In practice, most premium solar cables on the market are halogen-free regardless of which standard they're certified to. But the EN 50618 requirement removes any ambiguity: if it's EN 50618, it's LSZH, period.
3.2 Conductor Size Range
EN 50618 covers 1.5 mm² to 240 mm². IEC 62930 extends to 400 mm². For utility-scale projects where large-section DC cables (185–400 mm²) are used for array-to-inverter trunk runs, the IEC standard provides certified coverage that EN 50618 doesn't.
3.3 Thermal Extension (Hot Set) Test Temperature
EN 50618 conducts the hot set test at 250°C. IEC 62930 uses 200°C. This difference reflects the European standard's more conservative approach to cross-linking verification. In practical terms, cables that pass the 250°C test comfortably exceed the 200°C requirement.
3.4 Class II Equipment Provision
EN 50618 includes specific provisions for cables used with Class II (double-insulated) equipment. IEC 62930 does not. This is relevant for European installations where Class II inverters and junction boxes are common.
| Parameter | EN 50618 (H1Z2Z2-K) | IEC 62930 (IEC 131 / 134) |
|---|---|---|
| DC voltage rating | 1.5 kV | 1.5 kV |
| Conductor | Class 5 tinned copper (mandatory) | Class 5 or Class 2 tinned copper |
| Cross-section range | 1.5 – 240 mm² | 1.5 – 400 mm² |
| Halogen-free | Mandatory | Optional (131 = LSZH, 134 = may contain halogens) |
| Hot set test temp | 250°C | 200°C |
| Class II equipment | Provision included | Not addressed |
| Temperature range (ambient) | –40°C to +90°C | –40°C to +90°C |
| Max conductor temp (continuous) | 120°C | 120°C |
| Design life | 25 years | 25 years |
| UV resistance | Per EN 50618 Annex E | Per IEC 62930 Annex E (xenon-arc) |
| Ozone resistance | EN 60811-403 | IEC 60811-403 (equivalent test method) |
| Flame retardancy | IEC 60332-1-2 | IEC 60332-1-2 |
| Smoke density | IEC 61034 (≥60%) | IEC 61034 (≥60%, LSZH types) |
| Cable designation | H1Z2Z2-K | 62930 IEC 131 or 134 |
4. Test Regimes: How They Compare
Beyond the table, the test methods referenced by both standards are drawn from the same IEC pool—IEC 60811 for mechanical tests, IEC 60216 for thermal endurance, IEC 60332 for flame retardancy, and so on. A Copper Alliance study (Publication No. Cu0280, "Comparing PV cable current carrying capacities as specified in EN 50618 and IEC 62930") confirmed that ampacity values are essentially identical when the same temperature rise (60 K) is considered.
Here's where they do diverge:
| Test Category | EN 50618 | IEC 62930 | Practical Impact |
|---|---|---|---|
| Thermal endurance verification | Per EN 60216, rigorous Arrhenius extrapolation | Per IEC 60216, equivalent methodology | Minor — both use same core method |
| Damp heat test | 1,000 h at 90°C / 85% RH | 1,000 h at 90°C / 85% RH | Identical |
| Cold bending / impact | –40°C | –40°C | Identical |
| UV / weathering | Annex E (based on HD 605 / ISO 4892-2) | Annex E (based on ISO 4892-2, xenon-arc) | Near-identical — both use xenon-arc |
| Long-term DC resistance (water immersion) | 240 h at 85°C, 1.8 kV DC | 240 h at 85°C, 1.8 kV DC | Identical |
| Dynamic penetration | Annex D | Annex D | Identical |
| Hot set (cross-link check) | 250°C | 200°C | EN 50618 more stringent |
5. Regional Acceptance: Which Standard Where?
The practical question for most buyers is: which standard does my project need?
| Region / Market | Preferred Standard | Notes |
|---|---|---|
| European Union | EN 50618 | Harmonized under CPR. Mandatory for CE marking. IEC 62930 alone is not sufficient. |
| United Kingdom | BS EN 50618 | Retained after Brexit. BS 7671 references it. |
| Middle East & Africa | Both accepted (EN 50618 preferred) | Many tenders specify EN 50618 for its stricter material requirements. |
| Southeast Asia | Both (IEC 62930 common) | Local standards often reference IEC 62930. EN 50618 is accepted as equivalent. |
| Australia & New Zealand | EN 50618 | Widely accepted in Australian market practice for new solar installations. |
| North America | UL 4703 (separate) | Neither EN 50618 nor IEC 62930 is recognized. UL 4703 applies. |
| India | Both (IEC 62930 common) | EN 50618 widely accepted in Indian utility-scale projects alongside IEC 62930. |
| South America | IEC 62930 (growing) | Markets like Brazil and Chile widely accept IEC 62930. |
💡 Practical Rule
If your project is in Europe, Australia, or a market that follows EU standards: specify EN 50618. If it's in Asia, the Middle East, or South America: IEC 62930 is widely accepted. If you're not sure: dual-certified (EN 50618 + IEC 62930) covers both.
6. How to Verify Certification: Spotting Fake Compliance Claims
Fake certificates are a real problem in the solar cable trade. A supplier might print "TÜV certified" or "IEC 62930 compliant" on a data sheet without holding a valid certificate. Here's how to check.
Step 1: Find the Certificate Number
Every certified cable has a certificate number printed on the sheath, usually near the type designation. For TÜV-certified cables, the format typically starts with "R" followed by digits (format varies by certification body).
Step 2: Verify in the Official Database
TÜV Rheinland Certipedia — Go to certipedia.com and enter the certificate number. The listing will show the standard (IEC 62930, EN 50618, or both), the certificate holder, product model, and validity date. If the certificate doesn't appear, or if the listed model doesn't match the cable, the claim is unverified.
UL Product iQ — For UL-certified cables, go to productiq.ul.com and search by company name or certificate number.
IECEE CB Scheme — For IEC 62930 certification, the manufacturer should have a CB Test Certificate (CBTC). You can request the CBTC number and verify it through the IECEE members' portal.
Step 3: Check the Cable Marking
A genuinely certified cable carries the type designation and certificate number at regular intervals along the sheath. For EN 50618: look for "H1Z2Z2-K" plus the certificate number. For IEC 62930: look for "62930 IEC 131" (halogen-free) or "62930 IEC 134" (halogen-containing). If the print says "H1Z2Z2-K" but the cable surface feels wrong or the print rubs off easily—that's a red flag. You can see examples of properly marked certified cables in our solar cable product range.
⚠️ Common Red Flags
Certificate number doesn't appear in the Certipedia database. The printed type designation uses incorrect letter casing (e.g., "H1z2z2-k" instead of "H1Z2Z2-K"). The supplier provides a PDF "certificate" but no verifiable online record. The price is 30–50% below market average for a certified cable.
7. The Cost Question: Single vs. Dual Certification
Manufacturers who certify their cables to both EN 50618 and IEC 62930 pay for two sets of testing and ongoing factory surveillance. That cost is absorbed into the cable price—but it's typically marginal. For the buyer, the benefit of dual certification is simplicity: one cable, one stock-keeping unit, approved for projects in both European and international markets.
| Cost & Risk Factor | Single Certification | Dual Certification (EN + IEC) |
|---|---|---|
| Approved markets | EU or International, not both | EU + International + most others |
| Inventory complexity | Must stock separate SKUs per market | Single SKU covers multiple markets |
| Price premium vs. uncertified | Baseline + certification costs | Baseline + dual certification costs (~$0.02–$0.05/m more) |
| Risk of market rejection | Moderate if shipping outside target region | Low |
| Verification effort for buyer | Need to confirm which standard applies | One verification covers both |
8. SORIVO's Approach: Dual-Certified Solar Cables
At Sorivo, our solar cables are TÜV certified to EN 50618 on selected sizes. EN 50618 compliance means they meet or exceed the core requirements of IEC 62930, since the European standard is harmonized with—and in several areas stricter than—its international counterpart. Here's what that means in practice:
- One cable for multiple markets. Our H1Z2Z2-K cables carry TÜV certification under EN 50618, which is accepted as equivalent to IEC 62930 in most markets outside North America. You don't need to stock separate inventory for EU vs. non-EU projects.
- Full traceability. Each production batch is third-party tested, and the certificate numbers are printed on the cable sheath. You can verify them in the TÜV Certipedia database.
- Tinned copper, Class 5. All our solar cables use IEC 60228 Class 5 stranded tinned copper—meeting EN 50618's mandatory requirement and compatible with IEC 62930's Class 5 specification.
✅ Dual Certification = One Less Procurement Headache
You spec it once, stock it once, and it's approved for European and international projects. If your supply chain crosses multiple markets, that simplicity saves time—and avoids the risk of a non-compliant cable showing up on site.
Our certified solar cable range:
- H1Z2Z2-K 4 mm² Tinned Copper Solar Cable — TÜV certified, EN 50618 compliant
- H1Z2Z2-K 6 mm² Tinned Copper Solar Cable — TÜV certified, EN 50618 compliant
- H1Z2Z2-K 10 mm² Tinned Copper Solar Cable — TÜV certified, larger section for commercial strings
9. Frequently Asked Questions
What is the main difference between IEC 62930 and EN 50618?
EN 50618 is the European standard that mandates halogen-free construction and tinned copper conductors. IEC 62930 is the international standard that allows both halogen-free and halogen-containing cables, with a wider conductor size range (up to 400 mm²). Core performance requirements—voltage rating, temperature range, UV and ozone resistance—are nearly identical.
Can I use an EN 50618 cable in a project that specifies IEC 62930?
In most cases, yes. EN 50618 cables meet or exceed IEC 62930 requirements because the European standard is stricter in several areas (halogen-free mandatory, hot set test at 250°C). However, verify with the project engineer—some specifications may require the IEC designation on the cable sheath itself. If that's the case, dual-certified cables solve the problem.
What cable markings indicate IEC 62930 vs. EN 50618 compliance?
EN 50618 cables are marked H1Z2Z2-K. IEC 62930 halogen-free cables are marked 62930 IEC 131; halogen-containing types are marked 62930 IEC 134. Dual-certified cables may carry both designations. The certificate number is printed on the sheath for both standards.
Does EN 50618 cover cables larger than 240 mm² for utility-scale solar farms?
No. EN 50618's scope stops at 240 mm². For cross-sections above that (e.g., 300–400 mm² trunk cables), IEC 62930 is the applicable standard. Many utility-scale projects specify both standards: EN 50618 for string and array cables, IEC 62930 for large-section trunk runs.
How often does certification need to be renewed?
TÜV and IECEE certifications typically require annual factory surveillance audits and periodic re-testing as specified by the certification body. Always check the validity date on the certificate. A certificate that expired two years ago is as good as no certificate.
10. Conclusion
IEC 62930 and EN 50618 are more alike than different. They share the same voltage rating, the same temperature range, the same core test methodologies, and the same 25-year design target. The differences—halogen-free mandate, hot set temperature, cross-section range—matter primarily for specific use cases and regulatory environments.
If you're procuring for a European or Australian project, EN 50618 is the standard you need. For projects in Asia, the Middle East, Africa, or South America, IEC 62930 is widely accepted. For maximum flexibility, dual-certified cables eliminate the need to choose.
The important thing is not which standard you pick—it's that the cable you buy is genuinely certified to that standard, by a recognized third-party body, with a verifiable certificate number you can check online.
Need dual-certified solar cable for your project?
Contact our engineering team for certified solar cables with full traceability documentation. We'll confirm the right standard and certification for your market.
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