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Zogzog, no I didn't correct @ different temps. But should the resistance go up when the temp inceases?

Thank you for all your responses. The MCC is 600V, 800A bus rating, 3 wire, 3 phase, and it is 7 section long. The MCC is located in an electrical room around 10 degrees C (50 F). We have MCC's that are 12 sections long and they all meggered aboved 2.2 G-ohm. When the MCC's are meggered all...

gepman, the phase to ground reading are pretty much the same as the phase to phase (minor difference). The MCC's contains a mix of E3 Plus type overload starters and fuse disconnects ... same as the other MCC's we have.

We have a voltmeter on the horizontal MCC bus that is fused. Other than that we have no other PT's in the MCC. Does that answer your question?

We were taking megger readings (phase to ground and phase to phase) for an MCC before first-time energization, and the results that we're getting were below 1.0 gega ohms. All the other MCC's on site registered greater than 2.2 gega ohms for the same test. We noticed that once we start pulling...