Professional cable manufacturer
EN 50618 / IEC 62930 · IEC 62852 · IP68 · 1500V DC
4mm² Solar Extension Cable with MC4 Connectors
A factory pre-terminated PV extension assembly — H1Z2Z2-K 4mm² tinned-copper cable crimped to an IEC 62852 MC4-compatible male/female pair, cut to your length. The DC string is plugged together on site, not crimped.
1.5/1.5 kV
Rated DC Voltage
30 A
Connector Rating
IP68
Mated, 1 m / 1 h
0.3–20 m
Cut to Length
↓ Download Datasheet (PDF)
IEC 62852 connector pair
EN 50618 cable core
Crimped, pull-tested, 100% continuity checked
OEM lengths, colours & packing
PRE-TERMINATED PV HARNESS
EN 50618 / IEC 62930PV cable standard
IEC 62852PV connector standard
1500V DCSystem voltage class
IP68Mated, 1 m immersion
−40°C … +90°CCable ambient range
Key Specifications
The essentials, at a glance
Everything a solar engineer checks first — before diving into the full datasheet below.
1500V DC
PV string voltage class
1.0/1.0 kV
Cable rated AC voltage
30 A
Connector, 50 A peak
≤ 0.5 mΩ
Contact resistance
5.09 Ω/km
Conductor max., 4 mm²
≥ 25 years
Design life
Product Overview
The crimp is the weak point — so we remove it from the site
This is not cable sold by the metre. It is a finished DC assembly: H1Z2Z2-K 4mm² photovoltaic cable cut to length, terminated at the factory with an MC4-compatible male and female pair, continuity checked and pull-tested before it is packed. What arrives on site is a part that plugs into the next one. Loose contact pins, wrong crimp dies, half-inserted grommets and mismatched polarity are the most common causes of a hot joint on a PV array, and every one of them is an on-site termination problem.
The cable core is H1Z2Z2-K to EN 50618 / IEC 62930 — single-core, Class 5 flexible stranded tinned copper, electron-beam cross-linked XLPO insulation and sheath, halogen-free and low smoke. In 4mm² it carries 55 A in free air at 60°C ambient and its maximum DC resistance is 5.09 Ω/km at 20°C, a loop voltage drop of about 10.18 V/A/km across the complete circuit.
The connectors are rated to IEC 62852, the standard for connectors used in photovoltaic systems. The pair is rated 30 A continuous (50 A peak) at up to 1500V DC, uses tin-plated copper contacts with ≤ 0.5 mΩ contact resistance, and seals to IP68 when mated. The bayonet-lock coupling is tool-free to close and releases with a standard MC4 release tool, and the housing is UL94 V-0 rated PPO/PPE.
The assembly rating is the lower of the two: 30 A continuous, set by the connector. That is the honest number for a 4mm² pre-terminated assembly and it is the one to design a string against. Moving up to 6 mm² does not raise that figure — the same 30 A connector pair caps the 6 mm² assembly too, so the larger cable buys lower resistance and voltage drop (3.39 against 5.09 Ω/km), not more current. Assembly temperature limits are the tighter of the cable and connector figures — the ambient range is −40°C to +90°C for the cable and −40°C to +85°C at the connector.
More about the manufacturer: About SORIVO →
Key Features
Eight things that decide whether a DC joint survives
Factory Pre-Terminated
Male and female MC4-compatible connectors are crimped and assembled in the factory, then pull-tested to ≥ 50 N and continuity-checked — no field crimping tools, no crimp-quality variance between crews.
IEC 62852 Connector Pair
The connector pair is built to the IEC 62852 standard for PV connectors, rated 30 A continuous and 50 A peak at up to 1500V DC, with a 6 kV AC / 1 minute proof test. The safety class of an MC4-type connector is voltage-dependent — confirm the class for your system voltage on the certificate.
IP68 Once Mated
The mated pair is sealed to IP68 — verified at 1 m depth for 1 hour. A dual-injection moulded seal body around the contact core keeps moisture out of the joint through rain, wash-down and ground-mount flooding.
1500V DC System Rating
Both the cable and the connector pair are rated for 1500V DC systems, matching modern high-voltage string architectures with longer strings and fewer combiner boxes.
Low Contact Resistance
Tin-plated copper contacts keep contact resistance at ≤ 0.5 mΩ, which is where a PV joint actually loses power and generates heat. Tinned rather than bare copper keeps that surface stable in humid and coastal air.
Tool-Free Bayonet Lock
The snap-in bayonet coupling closes by hand and is released with a standard MC4 release tool, so connections stay serviceable for string testing, module replacement and re-stringing without cutting cable.
Any Length, Either Polarity
Cut to order from 0.3 m to 20 m with no minimum increment, in black for DC− and red for DC+, or as flying leads, female-to-female, male-to-male and Y-branch variants.
Tinned Copper End to End
Class 5 stranded tinned copper conductor in the cable and tin-plated copper contacts in the connector — one corrosion-resistant metal system across the whole current path, with no bare-copper transition.
Applications
Where a pre-terminated assembly earns its cost
Any DC segment that is measured, cut and terminated on site is a segment that can be shipped already made.
01
Module-to-Module Jumpers
The short link between adjacent modules in a row, where 4mm² is the standard size and the connector quality decides the joint temperature.
02
String & Row Extensions
Bridging the gap between the end of a module row and the next, in the exact length the layout needs instead of a coiled standard jumper.
03
Inverter DC Input Leads
The final run from the last string connector into the inverter or DC combiner, terminated with the connector the inverter input expects.
04
Combiner Box Wiring
String tails into the combiner enclosure, where an IP68 factory joint removes the need to re-crimp inside a confined box.
05
Commercial Rooftop Retrofit
Re-stringing and module replacement on existing rooftops, where assemblies can be made up in advance and fitted in a single visit.
06
Utility-Scale PV Farms
Volume sites where thousands of identical, pre-measured jumpers are the difference between a scheduled and a slipping commissioning date.
07
Floating & Ground-Mount Arrays
Pontoons, tracker rows and open ground where the IP68 mated seal and the tinned contact surfaces face permanent humidity.
08
Carports, Street Lighting & Off-Grid
Small systems built from kits, where a ready-made assembly means the installer does not need to own a crimping tool at all.
Technical Specifications
Full specification sheet
The complete parameter set — the same data our engineers quote from.
Table 1 Cable dimensions, resistance and current rating by cross-section
| Cross-section mm² | Conductor dia. max. mm | Overall diameter min. – max. mm | Weight approx. kg/km | Min. bending radius fixed, mm | Max. DC resistance at 20°C, Ω/km | Current in free air at 60°C, A | Short-circuit current 1 s, kA |
|---|---|---|---|---|---|---|---|
| 1.5 | 1.6 | 4.4 – 5.0 | 35 | 15 | 13.7 | 30 | 0.21 |
| 2.5 | 1.9 | 4.8 – 5.4 | 46 | 17 | 8.21 | 41 | 0.36 |
| 4 | 2.4 | 5.3 – 5.9 | 61 | 18 | 5.09 | 55 | 0.57 |
| 6 | 2.9 | 5.8 – 6.4 | 80 | 20 | 3.39 | 70 | 0.86 |
| 10 | 4.0 | 7.0 – 7.6 | 122 | 23 | 1.95 | 98 | 1.43 |
| 16 | 5.6 | 9.0 – 9.8 | 200 | 30 | 1.24 | 132 | 2.29 |
| 25 | 6.4 | 10.3 – 11.2 | 290 | 34 | 0.795 | 176 | 3.58 |
| 35 | 7.5 | 11.7 – 12.5 | 400 | 50 | 0.565 | 218 | 5.01 |
The 4 mm² row is highlighted — it is the size these assemblies are built on. The same cable core is produced from 1.5 mm² to 35 mm², with larger sizes to order; pre-terminated assemblies are offered in 4 mm² as standard and 6 mm² on request. Dimensions and weights are the published nominal figures for EN 50618 single-core cable and are subject to manufacturing tolerance; the values on the order confirmation take precedence. The current column is one cable in free air at 60°C ambient and must be derated for higher ambient temperature, grouping and enclosure — EN 50618 Table A4 factors are 0.92 at 70°C, 0.84 at 80°C and 0.75 at 90°C. Maximum DC resistance values are the IEC 60228 Class 5 tinned-copper limits.
Table 2 Cable construction and performance
| Cable — General | |
| Product Name | 4mm² Solar Extension Cable with MC4 Connectors (pre-terminated assembly) |
| Cable Type | H1Z2Z2-K single-core photovoltaic cable, 1 × 4 mm²; also available on PV1-F (TÜV 2PfG 1169) cable to order |
| Primary Standard | EN 50618:2014 — cables for photovoltaic systems; IEC 62930 |
| Further Standards | EN 60228 / IEC 60228 (conductor); EN 50565-1 (bending radius); EN 50575 (CPR, class stated on the Declaration of Performance) |
| Rated Voltage AC | U0/U 1.0/1.0 kV AC, maximum permissible operating voltage 1.2/1.2 kV |
| Rated Voltage DC | U0/U 1.5/1.5 kV DC, maximum permissible operating voltage 1.8/1.8 kV — for 1500V DC PV strings |
| Test Voltage (Cable) | 6.5 kV AC or 15 kV DC (alternative tests), 5 minutes |
| Cable — Conductor | |
| Conductor Material | Electrolytic tinned copper — corrosion-resistant strand surface |
| Conductor Type | Class 5 flexible stranded conductor, per EN 60228 / IEC 60228 |
| Max. DC Resistance | 4 mm²: 5.09 Ω/km at 20°C (other sizes in Table 1) |
| Conductor Diameter | 4 mm²: 2.4 mm maximum |
| Cable — Insulation & Sheath | |
| Insulation Material | XLPO (cross-linked polyolefin), electron-beam cross-linked, halogen-free |
| Sheath / Jacket | XLPO (cross-linked polyolefin), LSZH, UV and ozone resistant |
| Core / Sheath Colour | Black (standard, DC−) and red (DC+); other colours on request |
| Halogen-Free | IEC 60754-1; no corrosivity per IEC 60754-2 |
| Smoke Density | IEC 61034-1 / -2 — light transmittance > 70% |
| Sheath Marking | SORIVO H1Z2Z2-K 1 × <size> mm² 1.0/1.0 kV AC 1.5 kV DC EN 50618 IEC 62930 <year> — or per customer requirement |
| Cable — Electrical & Thermal | |
| Current Carrying Capacity | 4 mm²: 55 A free in air, 52 A on a surface, 44 A for two loaded cables touching, all at 60°C ambient (other sizes in Table 1) |
| Voltage Drop (4 mm²) | ≈ 10.18 V/A/km for the complete circuit loop at 20°C conductor temperature, calculated from the maximum conductor resistance |
| Insulation Resistance | ≥ 800 MΩ·km at 20°C — in-house routine test value |
| Ambient Temperature | −40°C to +90°C for fixed installation; −25°C to +60°C during handling and installation |
| Max. Conductor Temperature | +90°C continuous; +120°C for up to 20 000 h |
| Max. Short-Circuit Temperature | +250°C for a maximum of 5 seconds |
| Minimum Bending Radius | 3 × overall diameter up to 12 mm OD, 4 × overall diameter above 12 mm OD per EN 50565-1; published value for 4 mm² is 18 mm |
| UV Resistance | EN 50618 Annex E — 720 h / 360 cycles to EN 50289-4-17 method A |
| Ozone Resistance | Per EN 50396, test type B |
| Water Resistance | AD7 immersion per EN 50618; higher AD8 rating agreed per order and supported by the test record for the construction supplied |
| Flame Performance | IEC / EN 60332-1-2, single cable vertical flame propagation |
| Design Life | Minimum 25 years per EN 50618; 30 years at 90°C continuous conductor temperature on the Arrhenius basis |
| Connector Pair — MC4-Compatible | |
| Product Model | MC4-30A-IP68 — male + female bayonet-locking pair, pre-assembled |
| Connector Standard | IEC 62852; CE |
| Compatibility | Ø 4 mm MC4-type contact system — mates MC4 / Standard4 / PV4-style interfaces. Use one brand across a mated pair: mixed-brand pairs sit outside the IEC 62852 approval and are a known cause of DC arcing. MC4 is a registered trademark of Stäubli. |
| Rated Current | 30 A continuous, 50 A peak |
| Rated Voltage DC | 1000V – 1500V DC |
| Test Voltage (Connector) | 6 kV AC, 50 Hz, 1 minute |
| Contact Resistance | ≤ 0.5 mΩ |
| Contact Material | Tin-plated copper contacts, 99.98% copper purity |
| Housing Material | PPO / PPE, UL94 V-0 flammability rated |
| Ingress Protection | IP68 mated — verified at 1 m depth for 1 hour |
| Safety Class | Class II at DC 1100 V; Class 0 at DC 1500 V — voltage-dependent, see note below |
| Insertion / Pull-Out Force | Insertion ≤ 50 N; pull-out ≥ 50 N |
| Locking System | Bayonet-lock coupling, tool-free to close, released with a standard MC4 release tool |
| Connector Temperature | −40°C to +85°C |
| Accepted Cross-Section | 4 mm² and 6 mm² (AWG 10 – 12) |
| Assembly, Options & Logistics | |
| Assembly Current Rating | 30 A continuous — set by the connector, which is the lower of the cable (55 A) and connector (30 A) ratings |
| Available Lengths | 0.3 m to 20 m cut to any increment; standard 0.3 / 0.5 / 1 / 2 / 3 / 5 / 10 m; longer assemblies up to 50 m on request |
| End Configurations | Male–female (standard), female–female, male–male, connector-to-flying-lead, Y-branch, T-branch and fused variants |
| Routine Testing | Continuity and polarity verification plus connector pull-out test on every assembly; batch records retained |
| Packaging | Poly bag + inner box, bulk pack or custom packing per request |
| MOQ | 100 pcs; sample orders negotiable |
| Lead Time | 5–10 working days; stocked lengths may be available in 2–3 days |
Final selection should be based on string current, system voltage, run length, short-circuit conditions, installation method and applicable local requirements. The assembly rating is limited by the connector, not by the cable: the MC4-compatible pair is rated 30 A continuous with a 50 A peak, so moving from 4 mm² to 6 mm² lowers resistance and voltage drop but does not raise the assembly's continuous rating. If a string needs more than 30 A continuous, tell us and we will quote the connector system that suits it. On safety class: for MC4-type PV connectors the published IEC practice is Class II at DC 1100 V and Class 0 at DC 1500 V — the class follows the voltage rating of the construction ordered. The class applying to your order is stated on the connector certificate, so confirm it against your system voltage before specifying a 1500V DC string. Our engineers confirm the exact construction and certification scope with your project data.
Certificates & Standards
Verify before you buy — we make it easy
EN 50618 / IEC 62930
The European standard for cables in photovoltaic systems and its IEC equivalent, covering the H1Z2Z2-K cable core of this assembly. Certificate of conformity on request.
Request certificate copy →IEC 62852 — PV Connectors
The standard for connectors used in photovoltaic systems, covering the MC4-compatible pair fitted to this assembly: rated current and voltage, contact resistance, IP68 sealing and locking. Type-test documents available on request.
Request test report →Fire, Smoke & Halogen
Cable to IEC 60332-1-2, IEC 60754-1 and -2 and IEC 61034 with light transmittance above 70%; connector housing rated UL94 V-0. The fire performance set required for rooftops and enclosed DC installations.
Request test report →
Transparency note: certification status and exact scope should always be confirmed against the certificate for the selected cable and connector construction. We provide the certificate and test reports with every quotation — no blank promises.
Quality & Factory
Made in a real cable factory, assembled and tested before it ships
The cable is extruded and tested under our own roof, and the assembly is crimped on the same site — which is why we can test the joint rather than just the components.
- 1Incoming material control — tinned copper wire, halogen-free XLPO compounds and connector bodies are checked before production starts.
- 2Cable extrusion and routine tests — conductor diameter, insulation eccentricity and sheath thickness tracked during extrusion, with an on-line spark test and a finished-cable 6.5 kV AC sample test.
- 3Assembly and crimp control — crimp height checked against the connector specification, then every assembly gets continuity and polarity verification and a connector pull-out test at ≥ 50 N.
- 4Batch documentation — conductor resistance, dimensions, crimp records and test results are retained for every production batch.
19+
countries served
60+
solar & storage projects
100%
continuity & pull test
How to Order
From inquiry to boxed assembly in 5 steps
Send Inquiry
Tell us the length, cross-section, end configuration, colour and quantity.
Confirm Configuration
We confirm cable type, connector pairing, labelling and quotation within one working day.
Sample Evaluation
Sample assemblies for fit and connector-mating checks — a few working days for stocked lengths.
Bulk Production
Cable extrusion, crimping and 100% continuity testing. Lead time 5–10 working days.
Delivery & Support
Bagged and boxed per length, with shipping documents and after-sales support.
FAQ
Questions buyers ask before ordering
Because the crimp is the part most likely to fail. A PV string joint overheats when the crimp is incomplete, the contact is only partly seated or the sealing grommet is pinched — all of which are on-site assembly errors rather than material faults. On a pre-terminated assembly the crimp is made on calibrated tooling in the factory, the connector body is closed by machine, and every unit is continuity-checked and pull-tested to ≥ 50 N before packing. If you prefer to terminate on site, the same H1Z2Z2-K solar cable and the connectors are both available separately.
Two standards, one for each component of the joint. The cable core is H1Z2Z2-K to EN 50618:2014 and IEC 62930: rated U0/U 1.0/1.0 kV AC and 1.5/1.5 kV DC with 1.8/1.8 kV maximum permissible operating voltage, proof-tested at 6.5 kV AC or 15 kV DC for 5 minutes. The connector pair is built to IEC 62852, the standard for connectors used in photovoltaic systems, rated 30 A continuous, DC 1100 V under IEC 62852:2014+Amd1:2020 and the DC 1500 V class under UL 6703 and TÜV 2 PfG 2330/03.2023, with a 6 kV AC / 1 minute dielectric test. The same assembly can also be built on PV1-F cable to TÜV 2PfG 1169 where a specification names that designation — note that the published ratings differ between the two standards, so tell us which one applies.
The interface is the standard Ø 4 mm MC4-type contact and bayonet-lock system, so the pair mates with MC4, Standard4 and PV4-style interfaces. What we do not claim is cross-brand interchangeability, and we would rather you did not rely on it: a mated pair made from two different manufacturers sits outside the scope of the IEC 62852 approval, and Stäubli's own assembly instructions tell users never to mate a Stäubli connector with another manufacturer's. Mixed-brand pairs are a known cause of DC arcing. We recommend using the SORIVO male and female halves as a pair; if your project names a specific brand, tell us at enquiry and we will quote accordingly. We also supply MC4-compatible connectors and pre-terminated harnesses on their own.
30 A continuous. The cable alone is rated 55 A in free air at 60°C ambient with a maximum DC resistance of 5.09 Ω/km at 20°C, but the connector pair is rated 30 A continuous (50 A peak), so the assembly takes the lower figure. Moving to 6 mm² does not raise the assembly rating: the same 30 A connector pair caps it, and the cable's 70 A free-air figure is only reached with a connector rated for it. What 6 mm² buys is lower resistance and voltage drop (3.39 against 5.09 Ω/km). Also remember that ampacity is not usually what sizes a string: for long runs the deciding factor is voltage drop, which for 4 mm² is about 10.18 V/A/km around the complete loop. Send us the string current and one-way run length and we will confirm.
Any length from 0.3 m to 20 m with no minimum increment, so the assembly matches the layout instead of the layout matching a stock jumper; standard stocked lengths are 0.3, 0.5, 1, 2, 3, 5 and 10 m, and longer assemblies up to 50 m are available on request. End configurations include male–female (standard), female–female, male–male, connector-to-flying-lead, Y-branch, T-branch and fused variants. Black sheath is used for DC− and red for DC+, and other colours or printed polarity labels can be added.
The mated pair is rated IP68 and has been verified at 1 m depth for 1 hour, with a dual-injection moulded seal body around the contact core. Two practical points matter more than the rating: the protection applies only when the pair is fully mated — an open connector on a string end is not sealed — and a joint that is repeatedly opened and closed relies on the grommet being correctly seated each time. Keep spare connectors capped, and replace the sealing grommet if it has been disturbed. The cable itself carries the AD7 immersion rating of EN 50618; the higher AD8 water-immersion class comes from the installation / IP side rather than from EN 50618, so it is agreed per order and supported by the test record for the construction supplied.
The tighter of the two components applies, so the connector sets the upper limit in practice: the cable is rated −40°C to +90°C ambient for fixed installation (−25°C to +60°C during handling and installation) and permits +90°C continuous conductor temperature, +120°C for up to 20 000 hours and +250°C for a maximum of 5 seconds under short circuit, while the connector pair is rated −40°C to +85°C. The connector housing is UL94 V-0 rated PPO/PPE. Keep the mated joint out of direct thermal insulation — a connector buried under insulation runs hotter than the cable it terminates.
Yes to both. Cable certificate and test documentation, and the IEC 62852 type-test documents for the connector, are provided with the quotation and with the shipment; the exact scope is confirmed against the certificate for the selected construction before the order is placed. SORIVO can also arrange sample orders for fit and mating checks — availability and lead time depend on length, cross-section and current stock. For battery racks, battery containers and PCS connections the dedicated product is our 1500V ESS Energy Storage Cable, which is designed around the TÜV 2 PfG 2693 requirements for cables connected to battery energy storage systems. Request documents and samples through the form below.
Need a sample assembly for your solar project?
Tell us the length, cross-section and end configuration — we reply within one working day.
Get a Free Quote
Send your extension cable requirement
The more detail you give, the faster and more accurate our quotation. Our engineers reply within one working day.
- Length per assembly and total quantity in pieces
- Cross-section: 4 mm² (standard) or 6 mm² for higher current
- End configuration: male–female, flying lead, Y-branch, fused or other
- Cable designation named in your specification: H1Z2Z2-K (EN 50618) or PV1-F (TÜV 2PfG 1169)
- Sheath colour and polarity marking, labelling, packing and destination market
Inquiry received
Thanks — our engineers will reply within one working day.
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