This step‑by‑step approach helps you determine width, depth, support spacing, and allowable load with confidence. Plan 20–30% spare capacity for growth. Remember separation rules for EMI and. Wire Mesh Cable Tray Fill Ratio = Cross section of cable / Cross section of tray According to NEC 392. IEC 61537 covers cable tray and cable ladder systems for the support and accommodation of cables, while NEC Article 392 governs cable. Quick Tray Fill and Load Calculations The folllowing tables and formulas are provided to help determine how many cables can be safely carried by each size wire mesh cable tray tray and to determine the appropriate distance between supports for the load, based on number of cables, cable tray size. Cable Information: Location: Engineer: #/Cond. Per NEC Tray Sizing Instructions 1) Insure that macros have been enabled.
