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Cable Grouping Drating in Cable Trays

Thread starter MagnusElec
Start date Aug 31, 2007

Status: Not open for further replies.

Aug 31, 2007

MagnusElec

Electrical

Based on NEC 310.15(B)(2)(a) Exception No. 2 and 392.11(A)(1), I've concluded that no derating due to grouping is required for three-conductor 0-600V power cables installed in a cable tray; regardless of the number of cables as long as the fill is not exceeded; in a single vertical layer; and without separation distance.

Is this correct? (The situation is different for medium voltage cables).

Thanks