Inflection Point Engineering Calculators

Cable Tray Fill Calculator

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.