TechnipFMC’s 66kV Dynamic Inter-Array Cable (DIAC) has now been qualified to CIGRE TB 862, adding to its existing CIGRE TB 722 and IEC 63026 qualifications for floating wind projects. With this milestone, TechnipFMC is the only company able to deliver a qualified DIAC inside a fully integrated Water Column iEPCI® scope.

During the 18-month qualification testing program for TB 862, a full-scale 66kV DIAC completed rigorous electrical type testing and wet-aging, including 1.5 million flex-fatigue cycles in an environment simulating harsh North Sea conditions. Bureau Veritas independently verified that testing was completed successfully.

This qualification significantly derisks projects, with any project-specific testing now confirming its performance rather than risking schedule delays on an unproven inter-array cable design.

As one of the most consequential decision points in a floating wind project, our DIAC is engineered from first principles for a dynamic environment and manufactured in our Newcastle, UK, facility. Because of the connectivity between the floater, the mooring system, and the environmental conditions, our engineered system reduces the interface risks and late-stage design changes often associated with standalone components.

Delivered inside Water Column iEPCI
Water Column iEPCI brings dynamic cable, mooring, anchoring, and installation under a single scope. Designing the cable around the floater, moorings, and installation plan from the outset removes the interface risk that package-by-package procurement builds in. It also gives insurers and lenders clearer evidence that technical risk has been identified and allocated.

"Developers all need the same thing before a project can move forward: evidence that the technical risk has been identified and allocated,” said Luana Duffé , Executive Vice President, New Energy. "A qualified cable inside an integrated scope gives them that. We reduce the risk to our customers, increasing delivery certainty.”

The DIAC builds on more than 50 years of subsea delivery and Newcastle's dynamic umbilical heritage. Learn more about our DIAC system and Water Column iEPCI, or meet the team October 7-8 at the Floating Offshore Wind 2026 conference in Aberdeen, Stand E40.

DIAC FAQ
What does CIGRE TB 862 qualification mean for a dynamic cable? CIGRE TB 862 is the recognized qualification standard for dynamic cables in floating offshore wind. Qualification to it means the cable design has completed a defined program of electrical, mechanical, and fatigue testing, with the results verified by Bureau Veritas as an independent third party.

What is the qualified envelope of TechnipFMC's 66kV DIAC? The qualified design is a three-core, double-armored, double-sheathed copper cable rated to 38/66 (72) kV at 50 or 60 Hz, with a maximum conductor temperature of 90° C, water depths to 350 meters, and a 25-year service life.

How does a DIAC differ from a static inter-array cable? Static inter-array cables in fixed-bottom offshore wind rest on the seabed and move very little. A dynamic inter-array cable connects floating turbines that move continuously with wind, wave, and current, so it must withstand tension, compression, bend-radius, and fatigue loading over its full-service life.

How does a qualified dynamic inter-array cable reduce floating wind project risk? A qualified cable has already been proven against defined requirements, so if a client elects to do a project-specific fatigue test, it is for confirmation rather than discovery. That removes a first-of-a-kind unknown from the critical path, reduces the chance of late-stage redesign, and gives technical authorities, insurers, and lenders documented evidence when assessing project risk.

Where does TechnipFMC manufacture its DIAC? The 66kV DIAC is manufactured at TechnipFMC's umbilical facility in Newcastle, UK, which has decades of dynamic umbilical manufacturing experience and supports UK supply chain and regional employment.

What is Water Column iEPCI? Water Column iEPCI is TechnipFMC's integrated engineering, procurement, construction, and installation model for floating offshore wind. It treats the full vertical system — including DIACs, mooring systems, anchors, and offshore installation — as a single co-engineered scope under one accountable team.