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Electrical Calculators
Presented by zeelladani.in
NEC 2023
ASHRAE 90.1
NFPA 70E
PDF Export
Nine brutally simple tools for commercial construction — load, cable, fault, protection, lighting, motors, backup power. No fluff. Just numbers. Every calculator exports a clean PDF of what you see on screen.
This toolkit is made for the Chief / Consulting / Construction Electrical Engineers (COE) who shape real projects. If you have a suggestion for any type of calculator you'd like to see here, write to me directly. Every request gets reviewed — the best ones get built.
Ampacity, derating, AWG ↔ mm², OCPD check per NEC 310.16.
Single & three-phase feeder + branch, NEC 3%/5% limits.
Connected load, demand factor, diversity, LPD check.
Bolted fault, point-to-point, AFC label per NEC 110.24.
Breaker sizing, fuse selection, Ib ≤ In ≤ Iz chain.
Branch loads, busbar sizing, neutral & PE conductors.
FLA, starting current, VFD, overload protection.
Lumen method, LPD, emergency lighting coverage.
Generator sizing, battery Ah, ATS rating.
Earth electrode resistance, grid, lightning protection per IEC 62305.
Array sizing, string design, inverter DC/AC ratio, battery bank.
IEEE 1584 incident energy, boundaries, PPE category.
kVA selection, impedance, inrush, harmonic K-factor.
If you have a suggestion for any type of calculator, please write to me. Built for the COE, by the COE.