Switchgear sizing with fault current verification
Switchgear sizing isn't just about load capacity — it's about interrupting capacity. ekx calculates both from the same model, so your switchgear rating is verified against real fault current data.
What you get
Switchgear bus rating verified against calculated demand load.
Available fault current at the switchgear calculated and checked against equipment interrupting rating.
Main overcurrent protection sized based on calculated demand and NEC requirements.
Individual feeder breakers sized for downstream loads with duty checks.
Breaker trip settings evaluated in the context of system fault currents.
Switchgear is part of the complete system model — fault currents, voltages, and loading all calculated together.
Switchgear sizing that considers the full picture
Sizing switchgear means verifying it can handle both the load and the available fault current. ekx calculates both from the same model and checks both automatically.
- Demand load and available fault current calculated from the model
- Bus rating checked against calculated load
- AIC rating checked against calculated fault current
- Feeder breakers sized with individual duty checks
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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
Bus continuous current rating against calculated demand, and bus bracing (short-circuit withstand) rating against calculated fault current.
Yes. Every breaker in the switchgear has its interrupting capacity checked against the available fault current at that bus.
From the system impedance model per ANSI/IEC methods. The utility source data, transformer impedances, and all upstream impedances are included.
Yes. Multiple switchgear sections can be modeled in the one-line diagram, each with independent loading and fault current analysis.
Switchgear sized for load and fault current.
AIC verification, bus rating, and breaker sizing — all from the model.
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