The GroCable is a wear-proof marine cable used by fish farmers around the world. It is used to supply electrical power to and between farming cages, underwater lights, and other sea-based installations.



The renowned blue cable is produced from high-quality materials and is designed for use in extreme weather conditions. It has a virtually unlimited life expectancy when in an undisturbed installation. Should the cable require replacement, it is normally due to physical damage rather than wear. GroCable does not require a conduit or tube; it can be installed directly into the sea.


Halogen-free cables offer several advantages over traditional cables. They do not emit toxic gases or smoke when burned, making them safer for use in enclosed spaces. They are also more environmentally friendly, as they do not release harmful chemicals into the atmosphere. In addition, halogen-free cables are often more flexible and easier to work with than traditional cables, making them a popular choice in many industries.

High Mechanical Resistance

The GroCable is built to last in tough marine environments. Its highly wear-proof PU (Polyurethane) outer sheath protects the copper conductors from wear and tear. The core covering is made from extruded polyolefin compound, which gives the cable high flexibility. The conductors consist of stranded, flexible copper. These features combine to create a durable and damage-resistant cable.

High Chemical Resistance

The GroCable’s polyurethane outer sheath provides superior resistance against fuels, oil, grease, and other compounds present in marine environments. This feature makes it a top choice for aquaculture industries since its durable construction ensures that it can withstand exposure to these compounds without degrading or becoming damaged.

High Resistance against Environmental Factors

The GroCable is designed to withstand the harsh marine environment, including exposure to UV rays, ozone, humidity and water. The cable’s high-quality materials and construction ensure that it can resist degradation and damage caused by these environmental factors. This makes the GroCable a reliable and long-lasting option for fish farmers and other industries operating in marine environments.


Conductor: Bare Copper, Flexible, According to EN 60228class 5 
Insulation: EPR type EI 6 according to EN 50363-1
Common core covering: extruded polyolefin compound (only applicable for cables > 6mm²)
Outer sheath: TMPU compound (Polyurethan) according to EN 50363-10-2

All cables comply with the EN 50525-2-21 standard.

Designed for extreme weather conditions

We believe that simple and durable technology is key to efficient and profitable fish farming. And this clearly resonates with our ever-growing client base that includes fish farmers in the Faroe Islands, Scotland, Norway, Canada, and other countries around the world.

The GroCable is used in some of the most exposed offshore fish farms in the North Atlantic. They provide a stable power supply in the most extreme weather conditions, as they are some of the most durable and promising marine cables on the market today.

We are here to
guide you

Do you have questions, speculations or want to
chat about possibilities, get in touch.

Kristian Andreasen

Head of Sales

Faroe Islands

Robbie Duncanson

Sales (UK & Ireland)


Our clients say

Our goal is to reduce CO2 emissions with 50% by 2030. By diverting to landline power-supply for our feeding barges, we can reduce oil consumption and thereby emissions from our farm sites.

Jón Purkhús
Manager, Bakkafrost Faroe Islands

GroAqua delivered all the technical equipment for our farmsite in Sandsvág, Faroe Islands. They delivered the feeding barge, camera system, feeding system, internet, sensors and landline.

Hans Jákup Mikkelsen
Managing Director, Mowi Faroe Islands

GroAqua has a lot of experience in building feeding barges for areas with unpredictable weather and challenging seas. With a hybrid barge from GroAqua, we are taking big steps toward more sustainable farming.

Gauti Geirsson
CEO, Háafell


Working depth: 0.5-100 meters
Service temperature: -40 to +90 Celsius
Minimum bending radius: 5xD
Reverse bending strength: 30000 bendings
VAC Uo/U: 450/750V
VDC Uo/U: 560/1125V
AC frequency: 50-60 hz
Colour: Blue (~RAL 5015)
Lifespan: +100.000 hours
Warranty: 2 years from shipment date

Product Range

GroCable offers the following product range of cables. Additionally, we can provide custom cables if needed. Please contact us for more information.


GroCable 3G2.5 MM²

Nominal insulation (mm): 0.9 
Approximate Sheath (mm): 2.4
Outer Ø (mm): 12.7 – 13.2 
~ Cable weight (kg/km): 215


GroCable 5G2.5 MM²

Nominal insulation (mm): 0.9
Approximate Sheath (mm): 2.6
Outer Ø (mm): 15.0 – 16.0 
~ Cable weight (kg/km): 325


GroCable 5G6 MM²

Nominal insulation (mm): 1.0
Approximate Sheath (mm): 3.1
Outer Ø (mm): 19.5 – 21.0 
~ Cable weight (kg/km): 385


GroCable 5G10 MM²

Nominal insulation (mm): 1.2
Approximate Sheath (mm): 4.0
Outer Ø (mm): 26.0 – 28.0 
~ Cable weight (kg/km): 1000


GroCable 5G16 MM²

Nominal insulation (mm): 1.2
Approximate Sheath (mm): 4.0
Outer Ø (mm): 29.0 – 31.0
~ Cable weight (kg/km): 1375


GroCable Ethernet Extreme

Ethernet cable to use in extreme conditions. Thick insulation with Kevlar sheath.