Parallel Wire Calculator — Free Online Calculator
Calculate ampacity and sizing when running conductors in parallel per NEC 310.10(H).
How to Use This Calculator
Enter total load current and number of parallel sets.
The Formula Explained
NEC 310.10(H) allows parallel conductors of 1/0 AWG and larger. The total load is divided equally among parallel sets, and each set must be identical in length, gauge, material, and routing.