Latest notes
Designing Medium-Voltage Systems
Medium-voltage system design goes beyond selecting equipment!
Technical Note · August 27, 2026NEC and CEC are not two labels on one calculation
Where the two codes genuinely diverge, and why a tool that agrees at 30 C in a raceway has proven nothing.
Update · August 25, 2026Which IEEE 1584 edition is your arc flash study using?
The 2018 revision changed the model, not just the wording. A study built on the 2002 equations can land in a different PPE category.
Solutions
Comprehensive power system analysis and detailed electrical infrastructure design, prioritizing reliability and constructability.
Engineering tools
Precision calculators built for working engineers - dual-code NEC and CEC, free to use, no sign-up. Every result comes with the derivation trace behind it.
AC Conductor Sizing
Ampacity, derating, voltage drop, bonding and conduit fill - LV and MV, NEC and CEC, with a full calculation trace you can check.
OCPD Sizing
Fuse and breaker sizing for general loads, motors, transformers, listed equipment and capacitors - with the conductor-protection check.
Protection & Coordination
Time-current curves, one-line diagram editing, per-bus short circuit study and arc flash incident energy.
About
Koorosh Moghadam is an Electrical Engineer specializing in the design and analysis of complex power systems for critical industrial infrastructure. The focus is on precision, safety, and practical engineering - bridging the gap between theoretical analysis and real-world field implementation.
The site features free NEC/CEC-based calculators and engineering tools, along with practical knowledge and insights to help engineers strengthen their expertise in power systems.
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