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  1. NateSparks

    De-rating of Groups of Equally Loaded Parallel Cable Circuits Arranged in Trefoil Touching (Buried)

    Hi, Does anyone know how to calculate the de-rating factor for multiple parallel circuits of buried trefoil groups? The situation that I'm investigating is shown in the attached image. I've been trying to use IEC 60287-2-1 to figure out how to calculate the modified external thermal resistance...
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