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Thanks for your comments, waross. As I just joined Eng-Tips yesterday, I've been impressed by the number of times you, dpc, DavidBeach, and others have spent answering questions in these forums. The inspectors comment about grounding wires not being required if we used single conductor cable...

dpc - Unfortunately, the CSA tables for underground duct banks refer to 0-5 kV. I noticed that there was software called "AmpCalc" for calculating for individual bank arrangements, but I'm not sure if it deals with multiple sets. As for my poorly worded question, the code book would be a wee...

Thank you for your input, dpc and DavidBeach. I have a few questions/comments on your posts. DPC 1) Do you happen to know the NEC section that states derating is not required for any distance between <1000V duct banks? I only found the NEC Table (B-310-2) that relates to the individual bank...

We are feeding two new 1600A MCC's via an underground bus from an existing substation (with its switchgear fed by a Delta-Delta transformer). I have three questions relating to this, as I haven't been able to find the answers in the CSA code book. I would really appreciate your input on any of...