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Happened to see this while doing some work at a municipal water pumping station. The conductors in the picture are on the load side of a VSD feeding a 400HP 600V pump motor. The circuit consists of two parallel runs of 350kcmil CU THHN per phase. Both conductors of phases B and C are in the left 2”EMT and both conductors of phase A are in the pipe on the right which also has a 4 AWG EGC. At the time pics were made each conductor was carrying about 125A. Wire was cool but pipe on left was noticeably very warm to the touch.

electricman2
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