The growing demand for marine renewable energy and the electrification of coastal areas have made submarine cables 15 kV are essential in modern electrical projects. And 15kV submarine cable manufacturer must ensure that the cables withstand demanding marine environments, meet international standards and offer reliability for decades.

What is a submarine cable? 15 kV?
Medium voltage submarine cables are used to transmit electrical energy between islands, offshore wind farms, oil platforms and coastal networks. Besides, These cables must be resistant to hydraulic pressure, marine corrosion and mechanical loads during installation and operation. For this reason, A specialized manufacturer incorporates high-quality materials and performs rigorous testing.
In addition, These cables must meet international standards such as IEC 60228, IEC 60502, IEC 60840 y ASTM, guaranteeing compatibility and security.
Structure of a submarine cable 15 kV
A typical cable 15kV submarine cable manufacturer includes the following layers:
Conductor
The driver can be copper or aluminum, and its section varies according to current needs and applicable regulations. Besides, Material selection influences the electrical resistance and durability of the cable.
Isolation
insulation is used XLPE o EPR, that offer electrical resistance, thermal and chemical. The same way, Provide protection against short circuits and partial discharges.
Screen and metal cover
The semiconductor screen and the lead cover (Lead Sheath) Prevent water ingress and ensure electrical integrity for decades.
armor layer
The armor can be galvanized steel or aluminum wire. This layer provides mechanical resistance against impacts and traction during installation, ensuring the structural integrity of the cable.
External cover
Finally, the outer cover of PE a PVC protects the cable against abrasion, corrosion and environmental factors. Therefore, guarantees durability even in extreme marine conditions.

IEC conductor sizes (25 mm² – 2000 mm²)
According to the standard IEC 60228, Manufacturers produce cables with conductors of different sections. The most common sizes in submarine cables 15 kV are the following:
| IEC Section (mm²) | Conductor | Isolation | lead cover | Armor | External cover |
|---|---|---|---|---|---|
| 25 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 35 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 50 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 70 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 95 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 120 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 150 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 185 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 240 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 300 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 400 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 500 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 630 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 800 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1000 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1200 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1400 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1600 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1800 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 2000 | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
ASTM Conductor Sizes / AWG (20 AWG – 1000 MCM)
For North American or international projects, submarine cables 15 kV are also manufactured following ASTM / AWG. The most commonly used sizes include:
| Driver size | Conductor | Isolation | lead cover | Armor | External cover |
|---|---|---|---|---|---|
| 20 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 18 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 16 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 14 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 12 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 10 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 8 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 6 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 4 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 3 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 2 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1/0 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 2/0 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 3/0 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 4/0 AWG | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 250 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 300 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 350 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 400 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 500 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 600 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 750 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
| 1000 MCM | Cu / Al | XLPE / EPR | Yeah | Steel / Al | PE / PVC |
Complete technical table of submarine cables 15 kV
| Section (mm² / AWG) | Conductor | Conductor diameter (mm) | Insulation thickness (mm) | Armor thickness (mm) | External diameter (mm) | Weight (kg/m) | DC resistance (Oh/km) | Rated current (A) |
|---|---|---|---|---|---|---|---|---|
| 25 | Cu | 5,64 | 3,6 | 4,0 | 20,5 | 2,1 | 0,727 | 125 |
| 50 | Cu | 7,98 | 3,9 | 4,0 | 23,8 | 3,5 | 0,386 | 185 |
| 95 | Cu | 11,0 | 4,5 | 4,5 | 30,2 | 6,2 | 0,206 | 265 |
| 120 | Cu | 12,2 | 4,5 | 4,5 | 32,8 | 7,7 | 0,153 | 310 |
| 185 | Cu | 15,3 | 5,0 | 5,0 | 38,6 | 11,8 | 0,099 | 390 |
| 240 | Cu | 17,5 | 5,0 | 5,0 | 43,2 | 15,5 | 0,076 | 450 |
| 400 | Cu | 22,5 | 5,5 | 5,5 | 52,8 | 25,8 | 0,048 | 600 |
| 630 | Cu | 28,3 | 6,0 | 6,0 | 63,5 | 39,5 | 0,030 | 780 |
| 1000 | Cu | 35,7 | 6,5 | 6,0 | 78,2 | 62,0 | 0,019 | 980 |
| 1200 | Al | 39,6 | 6,5 | 6,5 | 85,0 | 57,0 | 0,015 | 1020 |
Use: Table includes both IEC and ASTM/AWG equivalent conductors; nominal current values are a 90 °C conductor temperature, cold water installation.
Submarine cable applications 15 kV
The cables of 15 kV are widely used in:
- Offshore wind farms: for interconnection of turbines and marine substations. Besides, They guarantee stable transmission of energy over long distances.
- Electrical connection of islands: allow supplying energy to island communities without depending on fossil fuels.
- Oil and gas platforms: supply power to critical equipment, reducing operational risks.
- Coastal distribution networks: interconnection of substations and distribution to port areas.
Therefore, and 15kV submarine cable manufacturer Reliability is essential to ensure efficiency and safety in these projects.
International tests and standards
To ensure quality, manufacturers carry out rigorous testing:
- Electrical: stress test, partial downloads, DC resistance.
- Mechanical: traction, flexion, impact.
- Environmental: resistance to water penetration, corrosion and thermal aging.
Besides, The cables comply with international standards such as IEC 60228, IEC 60502, IEC 60840, ASTM B3, ASTM B8 y IEEE, which ensures security, durability and global compatibility.

How to choose a submarine cable manufacturer 15 kV
When selecting a 15kV submarine cable manufacturer, consider:
- Experience and projects carried out in marine environments.
- Ability to manufacture according to IEC y ASTM with all required sections.
- Certified quality tests and compliance with international standards.
- Flexibility in conductor materials, isolation, armor and cover.
- Technical support and installation guarantee.
Besides, It is recommended to request references from similar projects and check the manufacturer's track record in offshore supplies, thus guaranteeing the safety and longevity of the cable.

Conclusion
Los China submarine cables of 15 kV They are the backbone of many marine energy infrastructures. And 15kV submarine cable manufacturer reliable must offer copper or aluminum conductors according to IEC and ASTM standards, with XLPE or EPR insulation, steel or aluminum armor and PE or PVC outer cover. Thanks to rigorous testing and high-quality materials, These cables ensure the efficiency, safety and durability of the most demanding energy projects.
