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Are you up to date with the IACS standards?

The marine segment has tough requirements when it comes to power quality and harmonics. Did you know that the International Association of Classification Societies (IACS) has revised the unified requirement for ships' power quality? UR E24 REV1 focuses on the power quality and harmonics. In line with most individual classification societies, the UR E24 REV1 has the maximum total harmonic distortion THDu up to 49th harmonic set at 8%. A new and important factor is that they also require you to constantly measure the voltage distortion.

The UR E24 REV1 applies to all ships contracted for construction after 1 July 2020, and requires that they:

  • Continuously monitor the levels of harmonic distortion experienced on the main busbar
  • Alarm when exceeding the distortion limit
  • Keep an electronic or paper log covering distortion level

There are also confirmed rules that are waiting for implementation date. The new rules will be that:

  •  The ship shall, annually, measure harmonics in seagoing conditions in a professional manner
  • A report shall be presented to the surveyor at periodical machinery survey

With the revised IACS rules we believe and hope that power quality is not only a paragraph in the rule book but also an item that is highlighted when assessing ships power.


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