Mike Holt's Electrical Toolbox vs Scan & NEC Code

Mike Holt, the industry leader in the electrical industry (MikeHolt.com) has created an amazing, practical and useful app for the electrician, inspector, instructor, contractor and engineer. The app contains conductor sizing (including voltage drop limitations), circuit protection sizing, race sizing, equipment grounding conductor sizing for electric heating equipment (commercial and Residential), air-conditioning equipment (commercial and Residential), motors (commercial and Residential), Transformers (commercial) , and dwelling-unit service calculations and sizing.

Scan the plate. Get the number. ElectricCalc turns your phone into a voltage drop and conductor sizing calculator that works at zero bars — built for the guy already holding a meter in the other hand. For apprentices, journeymen, masters, contractors, maintenance techs and estimators working in feet, AWG and kcmil. ----------------------- # VOLTAGE DROP Volts, amps, one-way distance, conductor size, copper or aluminum, single or three phase. You get the drop percentage in numbers big enough to read at arm's length, plus the volts lost and what's actually left at the load. Over 3% it turns orange. Over 5% it turns red. You know the run is a problem before you pull the wire. ----------------------- # AMPACITY, DERATED Start with the conductor and the termination rating — 60C, 75C or 90C. Correct for ambient temperature. Derate for the number of current-carrying conductors in the raceway. Base ampacity and adjusted ampacity sit side by side, so you can see what the derate cost you. ----------------------- # SCAN THE PLATE INSTEAD OF TYPING IT Point the camera at a nameplate or panel label and it pulls out volts, amps and conductor size into a text box you can edit before it touches the calculator. Straight talk: it does well on printed labels and clean plates. Stamped, sun-faded and greasy plates still need thumbs. Runs entirely on your phone, no signal needed. ----------------------- # IT TELLS YOU WHICH TABLE Every result cites the section behind it. Voltage drop points at 210.19(A) for branch circuits and 215.2(A)(1) for feeders — and it's honest those are Informational Notes, not hard limits. Ampacity points at the base ampacity table plus ambient correction and conductor adjustment tables. Set your code year in Settings — 2017, 2020, 2023 or 2026 — and citations match what your AHJ enforces. On 2017 it cites 310.15(B)(16), not 310.16. Find the right page in thirty seconds instead of thumbing through Article 310. Not a substitute for the book. ElectricCalc is an independent tool, not affiliated with, endorsed by or certified by the NFPA. ----------------------- # NO SIGNAL, NO PROBLEM Every calculation and scan runs on the device. No account. No sign-up. No cloud sync. Basements, mechanical rooms, vaults, elevator shafts, new construction with nothing but steel around you — same speed as anywhere else. Your calculations, scans and history never leave your phone. ----------------------- # HISTORY Every calc you save comes back with all its inputs. Tap it, change the run length, recalculate. It remembers which code year you used. Unlimited, stored locally. ----------------------- # BUILT FOR HANDS IN GLOVES Dark screen, high contrast, readable in a dark panel room and in direct sun. Big targets and standard-value dropdowns instead of tiny keyboards. Reset asks first, then goes back to sane defaults instead of blanking on you. No ads, anywhere, ever. iPhone. ----------------------- # HOW ACCESS WORKS — PLEASE READ ElectricCalc gives you full access to everything for 7 days after install. After 7 days it takes a one-time purchase to keep calculating. There is no permanently free tier. That purchase is exactly that: one time. No subscription, no auto-renewal, no monthly bill, no annual fee, no pro tier added later — and no way for it to stop working on you at a panel because a card expired in an office somewhere. Buy it once and it stays unlocked on every device signed in to your Apple Account. Already bought it? Restore Purchase is on the purchase screen. Price may be lower during a limited-time promo window tied to your trial; the exact price always shows before you buy. ----------------------- # BEFORE YOU PULL WIRE ElectricCalc is a field estimation tool. Check every result against the National Electrical Code and your approved drawings before anything gets installed. Built to speed up the math, not to replace the code book, your AHJ, or an engineer's stamp.