Has anyone encountered an issue arising from an Amtech software update issued September 2025 which has changed how they calculate Zs of a circuit in line with IET guidance that came out in 2022? The change mainly effects cables run in parallel over longer distances
If so, has anyone found a way to alter cables which has previously passing Zs values but are now exceeding the max permitted Zs to bring the Zs value back to acceptable limits short of total infrastructure redesign? Or has anyone had any guidance from the IET on how this update can be handled for legacy projects where cable calculations have already been completed and the project is being built on site but changes to design during construction are required?
