NEC Mastery54 - App Store

Developed with insights from licensed electricians and instructors nationwide, NEC Mastery has helped thousands pass their certification exams. Built around the 2023 NEC Code with 2024 updates.

Prepare for your NEC Certification Exam with the most comprehensive study tool designed for Journeyman, Master Electricians, Electrical Contractors, Maintenance and Sign Electricians, Inspectors, and Examiners.

NOW IN ENGLISH AND SPANISH
Every question, calculator, reference table and help article is available in both languages. Terminology follows NFPA 70, Código Eléctrico Nacional - the official Spanish edition of the NEC - so what you study matches the exam you sit. Texas TDLR offers Spanish-language electrician exams through PSI against the 2023 NEC, which is exactly the edition this app is written to. Pick your language on first launch or change it any time in Settings; the whole app switches instantly, read-aloud voice included.

Quick Reference
Your pocket electrician's reference with 13 categories and 100+ items - all offline:
. Electrical Formulas (Ohm's Law, AC/DC power, impedance, power factor)
. Ampacity Tables (NEC 310.16, temperature derating, conduit fill adjustment)
. Wire Properties & Insulation Types
. Conduit Fill (EMT, RMC, PVC) & Conduit Bending
. Box Fill Calculations
. Voltage Drop Tables & Max Distance Lookups
. NEMA Plug/Receptacle Configurations
. Motor FLC Tables & Branch Circuit Sizing
. Grounding (EGC & GEC Sizing, Electrode Types)
. Transformer Formulas & OCPD Sizing
. Electrical Symbols & Unit Conversions
Bookmark any reference, search by NEC article number or keyword, and jump directly to related calculators.

20 NEC Calculators
Professional-grade calculators with NEC code references:
Ohm's Law, Power Converter, Wire Size, Ampacity Derating, Voltage Drop, Conduit Fill, Box Fill, Breaker Sizing, EGC Size, GEC Size, Motor Circuit, Motor Feeder, Lighting Load, EV Charger Load, Residential Load, Commercial Load, Transformer OCPD, Transformer Conductor, Cover Depth, and Fault Current.

Electrician Hour Log
Track your apprentice or journeyman work hours:
. 12 work categories and 4 sector types
. Dashboard with charts and goal tracking
. PDF export for state board submissions
. iCloud sync across all your devices

Books & Tools
Curated recommendations from working electricians - code books, test instruments, hand tools, and study guides.

Exams Covered
- Master & Journeyman Electrician: F16, F17, G17, T17
- Residential Electrician: F18, G18, T18
- Maintenance & Sign Electricians: F19, F21, F22, F23
- Electrical Contractor: F49
- Inspectors & Examiners: E1, E2, E3

Why Choose NEC Mastery
- 8,000+ exam-style questions with answers, NEC references, and detailed explanations
- Fully bilingual - English and Spanish, switchable at any time
- 20 professional NEC calculators for on-the-job use
- Quick Reference with 100+ items - ampacity, formulas, NEMA configs, and more
- Electrician hour log with iCloud sync and PDF export
- Covers the 2023 NEC Code with 2024 updates
- Choose your own syllabus - customize down to each individual article
- Mock tests and performance tracking to simulate real exams
- Instant feedback mode with explanations as you practice
- Dark mode and adjustable text size

Study by Chapter
1 General . 2 Wiring and Protection . 3 Wiring Methods and Materials . 4 Equipment for General Use . 5 Special Occupancies . 6 Special Equipment . 7 Special Conditions . 8 Communications Systems

Who Is This App For?
Apprentices and licensed electricians, residential/commercial/industrial electricians, contractors, inspectors, safety managers, engineers, and field technicians.

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EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Join thousands of electricians who have passed their NEC exams with NEC Mastery.

Version History • Switch exams or edit your syllabus without losing your progress.
• Mock test history is now kept per exam, and each attempt is labelled with the exam it was taken on.
• Your subscription keeps working offline and while the App Store is slow to answer. Restore Purchases and Lifetime unlock are more reliable.
• "My Plan" replaces "Upgrade" once you have subscribed.
• Ohm's law wheel calculators now share one engine for consistent results.
• Bug fixes and improvements. 54 Sep 30 • Spanish is now more complete: article headings, calculator and Quick Reference text, and a few screens that still showed English.
• Choosing your first exam no longer resets progress synced from your other devices.
• The Set your syllabus screen is fixed, and its weightage fields are readable in dark mode.
• Calculators: ampacity values are checked correctly, the number keypad no longer stops responding, and PDF reports include every result and caveat.
• Hour log PDFs keep text inside each column.
• Mock tests keep your question count across exams, and the slider now reaches its maximum.
• Restore Purchases now tells you what it found. Lifetime owners can restore from Settings.
• Exam reminders now arrive on the day you picked. 53 Sep 17 Now in English and Spanish.

• Full Spanish support — all 8,000+ questions, the 20 calculators, Quick Reference and Help, with terminology anchored to NFPA 70, Código Eléctrico Nacional, the official Spanish edition of the NEC
• Choose your language on first launch, or change it any time in Settings — the whole app switches instantly, no restart
• Spanish read-aloud voice is selected automatically when you switch

Also in this release:
• Corrected six questions that stated the Code incorrectly
• Required-marking wording now matches NFPA 70 exactly 52 Aug 25 Bug fixes related to cloud sync 51 Aug 19 Question banka corrections 50 Jul 20 • New Books & Tools — curated NEC code books, test instruments, hand tools, and study guides recommended for exam prep.
• Hour Log: new "Clear All" option for resetting log entries when you start a fresh apprenticeship cycle.
• Exam selection: larger tap area for easier picking, especially on iPad.
• Minor fixes and refinements throughout. 49 Jun 15 Bug fixes 48 May 17 Bug fixes 47 May 12 Bug fixes 46 May 8 Locale specific improvements 45 Apr 15 Clear all bookmarks feature added
Layout fixes 44 Apr 14 Bug Fixes 42 Apr 10 Major Update — 3 Powerful New Tools for Electricians!

QUICK REFERENCE (NEW)
Your pocket electrician's reference — better than Ugly's! 13 categories with 100+ reference items, all available offline:
• Electrical Formulas — Ohm's Law, AC/DC power, power factor, impedance, resonance
• Ampacity Tables — NEC 310.16 copper & aluminum, temperature derating
• Wire Properties — AWG specs, resistance values, insulation types
• Conduit Fill — EMT, RMC, PVC fill tables with conductor counts
• Conduit Bending — Offset multipliers, stub-up deducts, saddle bends
• Box Fill — Conductor volumes, standard box sizes, calculation examples
• Voltage Drop — 1Φ and 3Φ formulas, reference tables, max distance lookups
• NEMA Configurations — All common straight blade & locking plug/receptacle configs
• Motor Data — Single & three-phase FLC tables, branch circuit & OCPD sizing
• Grounding — EGC and GEC sizing tables, electrode types
• Transformers — Turns ratio, kVA-to-amps, OCPD sizing for ≤600V and > 600V
• Electrical Symbols — Receptacles, switches, lighting, panels, motors
• Unit Conversions — AWG↔mm², temperature, electrical units, fractions

Features: Bookmark any item, full-text search, recently viewed, tap-to-highlight table rows, copy to clipboard, links to related calculators.

20 NEC CALCULATORS (NEW)
Professional-grade calculators with NEC code references:
Ohm's Law, Power Converter, Wire Size, Ampacity Derating, Voltage Drop, Conduit Fill, Box Fill, Breaker Sizing, EGC Size, GEC Size, Motor Circuit, Motor Feeder, Lighting Load, EV Charger Load, Residential Load, Commercial Load, Transformer OCPD, Transformer Conductor, Cover Depth, Fault Current

ELECTRICIAN HOUR LOG (NEW)
Track your apprentice/journeyman work hours with iCloud sync:
• 12 work categories (Raceways, Conductors, Services, Motors, Lighting, etc.)
• 4 sector types (Residential, Commercial, Industrial, Maintenance)
• Dashboard with charts and goal tracking
• PDF export for submitting to your state board
• Syncs across all your devices via iCloud 41 Mar 27 UI Fixes 40 Mar 17 UI Fixes 39 Feb 19 Minor UI Fixes 38 12/04/2025 Minor UI Fixes 37 11/25/2025 Performance Improvement - Now the app runs faster!

We heard you! Your 3 most requested features are here:
Extensive Certification and Syllabus Selection
Much more complicated MCQ
History of 50 tests saved for analysis 36 10/22/2025 We heard you! Your 3 most requested features are here:
Extensive Certification and Syllabus Selection
Much more complicated MCQ
History of 50 tests saved for analysis

Bug Fixes in Mock Test for iPad 35 10/17/2025 We heard you!
Extensive Certification and Syllabus Selection
Much more complicated MCQ

But Fixes in Mock Test for iPad 34 10/13/2025 We heard you!
Extensive Certification and Syllabus Selection
Much more complicated MCQ 33 10/09/2025 Bug fixes in: Report Error Feature, Mock Test in Lite Version 32 05/01/2025 1. Bug Fix: Mock Test Empty
2. Exam Date Reminder.
3. Bookmarking.
4. Report error in review screen.
5. Time taken now includes review time as well. 31 04/19/2025 1. Exam Date Reminder.
2. Bookmarking.
3. Report error in review screen.
4. Time taken now includes review time as well. 30 04/18/2025 Bug Fixes in Exam Specific Mock Tests 29 03/14/2025