Base Ampacity: Based on NEC Table 310.16 (formerly 310.15(B)(16)) for insulated copper conductors rated 0-2000V at $30^\circ C$ ambient.

Temperature Correction Factor ($CF_T$): Derived from $CF_T = \sqrt{\frac{T_c - T_a}{T_c - 30}}$ where $T_c$ is the conductor temperature rating and $T_a$ is ambient temperature.

Bundle Adjustment Factor ($CF_B$): Per NEC 310.15(C)(1): 4-6 wires = 0.8, 7-9 wires = 0.7, 10-20 wires = 0.5.

Adjusted Ampacity: $I_{adj} = I_{base} \times CF_T \times CF_B$.