Calculators
NEC 392.22 cable tray fill percentage by tray size and cable mix, with weight loading check and ampacity derating factor per NEC 310.15(B)(3)(a).
Standards: NEC 392.22 (cable tray fill), NEC 392.18 / NEMA VE-1 (mechanical loading), NEC 310.15(B)(3)(a) (ampacity adjustment for >3 current-carrying conductors). Default fill limit 40% applies to multi-conductor cables < 2000V. For conductor count, this tool assumes ~3 conductors per cable row; adjust if your mix differs.
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