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Free tools & references
Field calculators and quick references — built and checked by a licensed C-10. Free, no sign-up, work on your phone.
Calculators
Conduit fillNEC Ch. 9Fill % and the smallest conduit that fits your conductors.Voltage dropNEC 210.19Drop V and %, plus the smallest wire that stays under 3%.Box fillNEC 314.16Required box volume vs. the box you picked — does it fit?Ohm's law & powerEnter any two of V, I, R, P — get the other two.
References
Educational references — verify against the current NEC and your AHJ. Need it done and permitted? Call a licensed C-10 → (650) 562-8594.
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