Breaker sizing per NEC, automatic
Overcurrent protection device sizing that follows NEC 240 automatically. Standard trip sizes from NEC 240.6. Changes to loads flow through to breaker sizes instantly.
What you get
Overcurrent protection sizing follows NEC 240 requirements including next-standard-size rules.
Sizes selected from NEC 240.6 standard ampere ratings. No non-standard values.
Breaker interrupting capacity checked against calculated fault currents automatically.
See upstream and downstream device sizes to evaluate coordination.
Change a load and breaker sizes adjust throughout the circuit.
Override any auto-sized breaker when engineering judgment requires it.
OCPD sizing that stays current with your design
Manual breaker sizing means recalculating every time a load changes. ekx keeps every breaker in your system sized correctly, automatically, as your design evolves.
- Breakers size automatically based on connected load and NEC rules
- Standard trip sizes selected from NEC 240.6
- Interrupting capacity checked against fault currents
- Sizes update live as loads change
Start free. Upgrade when you need more.
Free tier includes 1 project with up to 2 buses. Paid plans start at $27/month for consultants and $149/month for unlimited access.
View All PlansFrequently asked questions
NEC 240 for overcurrent protection sizing, including NEC 240.4 for protection of conductors and NEC 240.6 for standard ampere ratings.
Yes. Breaker interrupting ratings are automatically compared against calculated fault currents at each bus. Underrated devices are flagged.
Yes. Any breaker size can be overridden manually. The system will flag if your selected size doesn't meet NEC minimums.
Yes. The OCPD sizing applies to both breakers and fuses, following the same NEC requirements.