Phase Balance Across Panels
Per-phase totals, imbalance percent, and a greedy swap list to rebalance.
Example
You enter
- Circuits phase A, load (W) 1500; phase A, load (W) 800; phase B, load (W) 600; phase C, load (W) 700
- Imbalance threshold (%) 10
You get
- Average (W) 1200
- Initial imbalance 141.67 %
- After swaps 66.67 %
Details, formula, and sources
Per-phase totals, then imbalance % = (max - min) / average x 100. The swap suggestion is a greedy pass that moves the smallest fitting circuit from the heaviest phase to the lightest.
Engineering practice; NEC Article 220 by name.
Free read-only access at nfpa.org/freeaccess.
Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.
Field names used by the API: circuits, threshold_percent, average_W, imbalance_percent, final_imbalance_percent