| Condition | Rule | | :--- | :--- | | (< 24 inches) | Fill up to 60% allowed. | | Cable tray fill | Use different NEC table (Table 392.22). | | Mixed wire sizes | Sum individual areas (don't average). | | Equipment grounding conductor | Count it as a conductor (no exception for fill). | | Spare conduits | Size for future – use 40% of future planned wires. |