Direct answer: H1Z2Z2-K Dca-s1,d2,a1 is the European-standard "single-core photovoltaic DC cable" — H1Z2Z2-K is the model name per the harmonized standard EN 50618 (halogen-free cross-linked polyolefin insulation + sheath, tinned copper flexible conductor), and Dca-s1,d2,a1 is its CPR fire classification (per EN 13501-6 / EN 50575). It is primarily intended for the EU and CPR-aligned markets (UK, etc.), for permanently installed solar PV systems. For non-EU destinations, buyers usually expect IEC 62930 or local standard designations rather than the European Dca-s1,d2,a1 fire code.
Further reading: EU CPR Cable Certification Complete Guide (EN 50575 / Euroclass) · CPR Dca-s1,d2,a1 Code Breakdown · Selection comparison: EN 50618 vs IEC 62930
1. What Is H1Z2Z2-K?
Quotable definition: H1Z2Z2-K is a single-core, halogen-free, UV-resistant photovoltaic DC cable under the European harmonized (CENELEC) system, rated at 1 kV, designed for the DC side connection between solar modules and the inverter.
It solves a specific problem: in rooftop and ground-mount PV systems, module stringing and combiner wiring need a dedicated conductor that can withstand DC high voltage, outdoor UV exposure, thermal cycling, and moisture over the long term — ordinary building wires (e.g. BV/BVR) lack UV resistance and PV DC suitability and should not be substituted.
2. Designation Breakdown (H1Z2Z2-K)
| Segment | Meaning |
|---|---|
| H | Harmonised — European harmonized cable (CENELEC system) |
| 1 | Voltage rating 1 kV (AC U0/U ≈ 1.0/1.0 kV; PV DC working voltage up to 1.5 kV DC) |
| Z2 | Insulation: cross-linked polyolefin (XLPO/XLPE type, halogen-free); 2 = insulation code |
| Z2 | Sheath: cross-linked polyolefin (halogen-free, flame retardant, UV-resistant); 2 = sheath code |
| K | Flexible conductor (Class 5 finely stranded tinned copper), for fixed/flexible installation |
Common characteristics: single-core, tinned copper, halogen-free low-smoke, flame retardant, UV/ozone/moisture resistant (typically AD7, direct-burial capable), temperature -40~+90℃ (short circuit 120℃), design life ≥25 years. Common cross-sections: 4 / 6 / 10 mm² for different string currents.
3. Key Technical Parameters
| Parameter | H1Z2Z2-K (EN 50618) |
|---|---|
| Conductor | Tinned copper, Class 5 flexible |
| Insulation/Sheath | Cross-linked polyolefin (XLPO), halogen-free |
| Rated voltage | 1.0/1.0 kV AC; 1.5 kV DC (PV) |
| Temperature range | -40℃ ~ +90℃ (short circuit 120℃ / 5s) |
| Flame retardancy | Single vertical burn (IEC 60332-1-2) |
| Weathering | UV, ozone, moisture resistant; direct burial (AD7) |
| Design life | ≥ 25 years |
| Typical cross-section | 4 / 6 / 10 mm² |
Note: EN 50618:2014 is the harmonized standard; PV cable testing commonly also references EN 63000 and EN 50395 as supporting methods.
4. What Dca-s1,d2,a1 Means Here
The H1Z2Z2-K model describes the electrical and material structure, while Dca-s1,d2,a1 describes its fire performance for in-building installation in the EU, given by an independent CPR rating:
- Dca: passes EN 50399 bundled burn test, usable for inside EU buildings (one tier above Eca, which only does single-cable burn);
- s1: low smoke emission;
- d2: moderate burning droplet control (may produce sustained molten drips);
- a1: low acid gas emission (halogen-free low-smoke).
In other words, a cable marked H1Z2Z2-K Dca-s1,d2,a1 is both a compliant European PV wire and carries a fire class suitable for in-building use — the combination that lets it be installed compliantly in EU residential, commercial and industrial rooftop PV projects. See CPR Dca-s1,d2,a1 Code Breakdown for details.
5. Which Markets Does It Fit?
| Market | Applicable? | Notes |
|---|---|---|
| EU member states | ✅ Primary market | Cables permanently installed in buildings must carry CE + CPR DoP (Declaration of Performance); H1Z2Z2-K EN 50618 + Dca is the standard EU PV wire spec |
| UK (England/Wales) | ✅ (UKCA/CPR broadly aligned) | Still largely follows the CPR framework post-Brexit, with UKCA marking coexisting |
| Non-EU (Africa/S.America/Middle East) | ⚠️ Depends on local adoption | Often uses IEC 62930 or local standards; may not recognize the European Dca-s1,d2,a1 fire code |
| United States | ❌ | Uses UL 4703 / PV Wire (NEC system), not named H1Z2Z2-K |
| TÜV-system markets | Similar | Legacy name PV1-F (TÜV 2 PfG 1169); H1Z2Z2-K is the European harmonized code — similar materials, different standard |
Export note: H1Z2Z2-K Dca is the "right spec" for EU projects. For Africa, Brazil and similar markets, buyers more often want EN 50618 / IEC 62930 certification + locally accepted standard naming, not the European Dca-s1,d2,a1 fire code (unless the project itself is inside the EU).
6. Comparison With IEC 62930 / PV1-F
| Dimension | H1Z2Z2-K | IEC 62930 | PV1-F (TÜV 2 PfG 1169) |
|---|---|---|---|
| Standard system | EN 50618 (CENELEC, EU) | IEC 62930 (international) | Legacy TÜV spec |
| Primary market | EU | Global / non-EU | TÜV-system |
| Construction | Halogen-free XLPO ins+sheath | Halogen-free XLPO ins+sheath | Halogen-free XLPO ins+sheath |
| Voltage | 1 kV / 1.5 kV DC | 1.0/1.0 kV AC; 1.5 kV DC | 1.0/1.0 kV AC; 1.8 kV DC |
| Fire naming | Carries CPR (Dca, etc.) | Usually no EU CPR | Usually no EU CPR |
The three are close in materials and weather resistance; the difference is mainly the standard system and certification naming. The same production line often meets both EN 50618 and IEC 62930 — choose the marking per target market.
7. Engineering Selection Advice
Good fit for H1Z2Z2-K Dca-s1,d2,a1:
- Rooftop/ground-mount PV DC-side wiring in EU and UK markets;
- In-building tray/conduit permanent installation (requires Dca or higher fire class);
- Commercial/industrial rooftop PV, residential and commercial building PV circuits.
Use caution or upgrade when:
- Hospitals, schools, underground escape routes and other densely occupied spaces — Dca's d2 droplet control is moderate; often Cca or B2ca-s1,d0,a1 is required;
- Shipping to the US — use UL 4703 / PV Wire instead;
- Shipping to Africa/S.America where the buyer explicitly requires IEC — certify and name per IEC 62930.
When purchasing or bidding, verify: ① H1Z2Z2-K model and EN 50618 standard are explicitly stated; ② CPR DoP shows Dca-s1,d2,a1; ③ EXAP family coverage and cross-section range; ④ whether IEC 62930 is needed to cover non-EU markets.
8. Common Misconceptions
Misconception 1: H1Z2Z2-K is just a generic PV wire, globally universal Wrong. It is the European (EN 50618) designation; the US uses UL 4703, and many non-EU projects recognize IEC 62930. "Similar" refers to materials, but marking and compliance paths differ.
Misconception 2: Any H1Z2Z2-K meets all building fire requirements
Wrong. H1Z2Z2-K alone does not include a fire class; only a CPR rating such as Dca-s1,d2,a1 permits in-building use, and Dca is not the top tier — high-risk sites need Cca/B2ca.
Misconception 3: In Dca-s1,d2,a1, d2 means "few droplets" Wrong. d2 means it fails to meet the stricter d0/d1 requirements and carries a sustained burning-drip risk — important for densely occupied projects.
Misconception 4: PV1-F and H1Z2Z2-K are identical and interchangeable Wrong. Their materials are close but the standard systems and naming differ; tenders/certifications must use the correct code for the target market.
FAQ
Q1: What material does Z2 represent in H1Z2Z2-K? A: Z2 means cross-linked polyolefin (XLPO/XLPE type) insulation or sheath, in a halogen-free compound. The code appears twice — the first Z2 is the insulation layer, the second Z2 is the sheath layer, both halogen-free XLPO.
Q2: Which is better, H1Z2Z2-K or PV1-F? A: Materials and weather resistance are close; there is no absolute winner. The difference is the standard system: H1Z2Z2-K belongs to EN 50618 (EU), PV1-F to the legacy TÜV 2 PfG 1169. Pick the marking per target market; the same line often satisfies both.
Q3: Can H1Z2Z2-K be exported to the US? A: Not under the H1Z2Z2-K name. The US uses UL 4703 / PV Wire (NEC system) and requires separate US-standard certification and naming.
Q4: Does Dca-s1,d2,a1 matter for non-EU markets? A: Limited. Non-EU markets (e.g. Africa, S.America, Middle East) mostly use IEC 62930 or local standards and do not recognize the European CPR fire code, unless the project itself is inside the EU.
Q5: Does a cable marked H1Z2Z2-K automatically qualify for in-building use? A: Not necessarily. It also needs a corresponding CPR fire class (e.g. Dca-s1,d2,a1). A cable with only the model name and no CPR rating cannot be assumed to meet in-building permanent installation requirements.
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