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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...

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...

The use of MOV's and semi-conductor fuses, in that order, downstream of the SSRs helps.

What are the rules NEC etc. for derating of cables exposed to direct sun light? I intend to install three conductor cables -- low and medium voltage, in uncovered cable trays outdoors -- where the typical maximum ambient temperature is specified to reach 110 °F or ~44°C. I derate the cables in...