# Electric Master: NEC Panel — Wire Size, Box Fill & Schedule > Offline electrical calculator for electricians and engineers with NEC compliance. (iPhone/iPad app by Yusuf Can Samiloglu.) - Source: https://appshunter.io/ios/app/electric-master-nec-panel/id6760935722 (this page in markdown: same URL + `.md`) - Developer: [Yusuf Can Samiloglu](https://appshunter.io/developer/1863275820) - Category: Productivity, Utilities - Price: Free with in-app purchases - Rating: 3.60/5 from 5 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 46 MB - Languages: British English, French (France), German (Germany), Italian, European Spanish - Released: 2026-03-23 - Data updated: 2026-08-27 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/electric-master-nec-panel/id6760935722/reviews.md ## What is Electric Master? Every answer names the code table it came from — 310.16, Chapter 9, 250.122, Article 220 — so you can check it, cite it to an inspector, and learn it. That is the whole point. 20 calculators and a full panel planner. All of it works with no signal, in a basement, on a roof, in a crawlspace. NEW: PANEL PLANNER + ONE-LINE DIAGRAM Lay out the actual board on screen. Drag breakers, GFCI/AFCI devices, busbars and terminals onto the rail, wire them up, name every circuit. Then export a PDF with your logo: panel schedule, one-line diagram and a parts list, ready to hand over. FREE, NO ACCOUNT, NO ADS - VOLTAGE DROP — branch and feeder circuits, instant 3%/5% check - AMPACITY — NEC Table 310.16 lookup, every size and insulation type - GROUND WIRE — equipment grounding conductor per 250.122 - OHM'S LAW and POWER TRIANGLE - THREE PHASE - PANEL PLANNER — free to enter and draw, core devices included PRO CALCULATORS - WIRE SIZING — the right conductor for the circuit, accounting for voltage drop, ampacity and temperature - CONDUIT FILL — EMT, IMC, RMC, PVC and flexible raceway - CONDUIT BENDING — 9 bend types (offset, 3- and 4-point saddle, rolling offset, concentric, back-to-back, parallel offsets, matching centers), bender presets and an on-screen level - BOX FILL — junction box sizing per Chapter 9 - DWELLING LOAD — service sizing per Article 220 - NON-DWELLING DEMAND — commercial load calculation - SERVICE ENTRANCE — service and feeder sizing - GROUNDING ELECTRODE — per 250.66 - DERATING — temperature and conduit-fill factors - MOTOR — branch circuit protection per Article 430 - TRANSFORMER — overcurrent protection per Article 450 - FAULT CURRENT — available short-circuit current - EV CHARGER — EVSE branch circuit and load - SELECTIVITY — protective device coordination FOUR CODES, ONE APP NEC 2023 and 2026 - CEC 2024 (CSA C22.1) - BS 7671 - DIN VDE 0100. The app picks the right one for your region, and you can switch any time. Nobody else carries all four. PAY ONCE IF YOU WANT TO Every Pro calculator gives you free calculations first, so you can check the math against your own book before you decide. Then choose a one-time Lifetime purchase and never see a subscription again — or pay monthly if you prefer. BUILT FOR THE TRUCK, NOT THE OFFICE - 100% offline. No internet, no account, no sign-up. - No ads. No tracking. No data collected. - PDF reports with your company logo and licence number, US Letter or A4 - History with job names, side-by-side comparison, Siri Shortcuts, Home Screen widget Not affiliated with, endorsed by, or sponsored by the NFPA, CSA Group or the IET. NEC and National Electrical Code are registered trademarks of the National Fire Protection Association, Inc. Always verify against the adopted code edition in your jurisdiction. Terms: https://elly2504.github.io/electrocalc-pages/terms-of-use.html Privacy: https://elly2504.github.io/electrocalc-pages/privacy-policy.html ## Key features - NEC-compliant electrical calculators - Offline functionality - Voltage drop calculations - Ampacity and wire sizing - PDF export with branding - Calculation history - Siri Shortcuts integration ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | ElectriCalc Pro — Monthly | $9.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | ElectriCalc Pro — Lifetime | $59.99 | one-time | ## Frequently asked questions about Electric Master ### What electrical codes does ElectriCalc support? ElectriCalc supports the NEC 2023 and NEC 2026 editions, as well as the CEC 2024 (Canadian Electrical Code). The app can auto-detect the standard by region. ### Can I use ElectriCalc without an internet connection? Yes, ElectriCalc is designed to work 100% offline. You do not need an internet connection, accounts, or tracking to use its calculators on the job site. ### How many calculators are included in ElectriCalc? ElectriCalc offers a total of 20 calculators. Six are available for free, including Voltage Drop, Ampacity, and Ohms Law, with 14 additional Pro calculators available through in-app purchase. ### What professional features does ElectriCalc offer? Professional features include PDF export of branded reports with your logo and contact info, saved calculation history tagged by project, side-by-side comparison mode, Siri Shortcuts for voice commands, and a home screen widget. ### Does ElectriCalc have ads? No, ElectriCalc does not contain advertisements. The app focuses on providing a clean, uninterrupted experience for professionals. ### What is the pricing for ElectriCalc Pro? ElectriCalc Pro is available via a monthly subscription priced at $9.99 per month. This unlocks the 14 Pro calculators and advanced features. ### What devices is ElectriCalc compatible with? ElectriCalc is compatible with iPhones and iPads. It is rated for ages 4 and up. ### How often is ElectriCalc updated? The latest version of ElectriCalc is 1.4.0, last updated on May 4, 2026. Updates typically include new code editions and feature enhancements. ## Version history (last 5 releases) ### 2.2.0 — 2026-08-26 NEW NAME: this app is now called Electric Master. Same app, same team, same data — it just has a name of its own now. NEW: ONE-LINE DIAGRAM The app now draws a proper single-line diagram straight from the panel you laid out, with ANSI symbols and an orthogonal wire router, and puts it in the PDF next to the panel schedule. ALSO NEW • PANEL SCHEDULE — NEC 408.4 circuit directory, on screen and in the export • CONDUIT BENDING — 9 bend types, bender presets and an on-screen level • More devices on the rail: GFCI, AFCI and dual-function breakers, main lug kits, meter sockets, transfer switches • Faster canvas, cleaner wiring, and a pile of fixes that came straight out of your emails Keep the feedback coming — it is what this release is built from. ### 2.0.1 — 2026-07-09 v2.0.1 — Now you plan the panel, not just the math. NEW: PANEL PLANNER Build your distribution board right on screen. Drag MCBs, RCDs, busbars and terminals onto the DIN rail, wire them up, label everything — then hand over a clean PDF. • REAL DEVICE PALETTE — MCB, RCD/RCBO, SPD, busbars, terminals and more, on an actual rail. • MARKINGS — drop appliance symbols (oven, EV charger, heat pump…) and text labels, then resize and colour-code them. • ONE-TAP PDF — export a tidy board schematic + parts list, ready for handover. • 4 STANDARDS, 2 LANGUAGES — NEC · CEC · BS 7671 · DIN VDE, fully in English and German. This release is built on your reviews and emails — keep them coming. — The ElectriCalc Team ### 2.0 — 2026-06-28 v2.0 — Now you plan the panel, not just the math. NEW: PANEL PLANNER Build your distribution board right on screen. Drag MCBs, RCDs, busbars and terminals onto the DIN rail, wire them up, label everything — then hand over a clean PDF. • REAL DEVICE PALETTE — MCB, RCD/RCBO, SPD, busbars, terminals and more, on an actual rail. • MARKINGS — drop appliance symbols (oven, EV charger, heat pump…) and text labels, then resize and colour-code them. • ONE-TAP PDF — export a tidy board schematic + parts list, ready for handover. • 4 STANDARDS, 2 LANGUAGES — NEC · CEC · BS 7671 · DIN VDE, fully in English and German. This release is built on your reviews and emails — keep them coming. — The ElectriCalc Team ### 1.4.0 — 2026-05-04 v1.4 - TEN NEW CALCULATORS This is our biggest release yet. We doubled the lineup from 10 to 20. NEW PRO CALCULATORS EV CHARGER. Level 2 branch sizing per NEC Article 625. FAULT CURRENT. Short-circuit using Cooper Bussmann point-to-point method. SELECTIVITY. Selective coordination per NEC 240.86, citation-ready output. CONDUIT BENDING. 9 bend types plus bender presets (offset, saddle, kick, segment). SERVICE ENTRANCE. Disconnect sizing per NEC Article 230. NON-DWELLING DEMAND. Commercial load per NEC 220.42 with occupancy factors. GROUNDING ELECTRODE. GEC sizing per NEC 250.66. NEW FREE CALCULATORS OHMS LAW. V, I, R, P solver from any two inputs. POWER TRIANGLE. kW, kVA, kVAR, and power factor. 3-PHASE. Line-to-line and line-to-neutral conversions and balance checks. OTHER UPGRADES NEC 2026 support added (alongside NEC 2023). Voltage drop now matches Cooper Bussmann reference values. Faster PDF export, smaller file size. Improved derating-table accuracy for parallel runs. Refreshed App Store screenshots for clearer feature presentation. Better translations across the app. High-contrast mode polish. Bug fixes and performance improvements. Thanks to the electricians who emailed and reviewed - your feedback shaped this release. Keep it coming. We read every single one. - The ElectriCalc Team ### 1.3.0 — 2026-05-02 v1.3.0 — TEN NEW CALCULATORS This is our biggest update yet. We doubled the lineup from 10 to 20. NEW PRO CALCULATORS • EV CHARGER — Level 2 branch sizing per NEC Article 625 • FAULT CURRENT — Short-circuit using Cooper Bussmann point-to-point • SELECTIVITY — Selective coordination per NEC 240.86, citation-ready output • CONDUIT BENDING — 9 bend types + bender presets (offset, saddle, kick, segment) • SERVICE ENTRANCE — Disconnect sizing per NEC Article 230 • NON-DWELLING DEMAND — Commercial load per NEC 220.42 with occupancy factors • GROUNDING ELECTRODE — GEC sizing per NEC 250.66 NEW FREE CALCULATORS • OHM'S LAW — V, I, R, P solver from any two inputs • POWER TRIANGLE — kW ↔ kVA ↔ kVAR ↔ power factor • 3-PHASE — L-L ↔ L-N conversions and balance checks OTHER UPGRADES • NEC 2026 support added (alongside NEC 2023) • Voltage drop now matches Cooper Bussmann reference values • Faster PDF export, smaller file size • Improved derating-table accuracy for parallel runs • Better translations across the app • High-contrast mode polish • Bug fixes and performance improvements Thanks to the electricians who emailed and reviewed — your feedback shaped this release. Keep it coming. We read every single one. — The ElectriCalc Team ## More apps by Yusuf Can Samiloglu - [CleanScreen - Digital Detox](https://appshunter.io/ios/app/cleanscreen-digital-detox/id6760490712) - [IceDip — Cold Plunge Timer](https://appshunter.io/ios/app/icedip-cold-plunge-timer/id6760600918) - [DivCal](https://appshunter.io/ios/app/divcal/id6760601302) - [GynDiary](https://appshunter.io/ios/app/gyndiary/id6760619935) - [RestStop Finder](https://appshunter.io/ios/app/reststop-finder/id6760627436) - [Hustle Tracker - Side Income](https://appshunter.io/ios/app/hustle-tracker-side-income/id6760867854) All apps by Yusuf Can Samiloglu: https://appshunter.io/developer/1863275820 ## Related topics [yusuf can samiloglu](https://appshunter.io/ios/topics/yusuf-can-samiloglu) · [NEC calculator](https://appshunter.io/ios/topics/nec-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*