The Complete NEC Study Companion
Developed with insights from licensed electricians and instructors nationwide. Covers the latest NEC Code (2023 Edition and 2024 Updates).
8,000+ questions, 20 calculators, quick reference, hour log, and weighted mock exams — all offline.
What's New
Powerful new tools added to make NEC Mastery your all-in-one electrician companion
Quick Reference
Your pocket electrician's reference with 13 categories and 100+ items — all offline.
- •Electrical Formulas (Ohm's Law, AC/DC, impedance)
- •Ampacity Tables (NEC 310.16, derating factors)
- •Wire Properties & Insulation Types
- •Conduit Fill, Bending & Box Fill
- •Voltage Drop, NEMA Configs & Motor Data
- •Grounding, Transformers, Symbols & Conversions
20 NEC Calculators
Professional-grade calculators with NEC code references for on-the-job use.
- •Wire Size, Ampacity Derating & Voltage Drop
- •Conduit Fill & Box Fill
- •Residential & Commercial Load Calculations
- •Motor Circuit & Motor Feeder Sizing
- •EGC, GEC & Breaker Sizing
- •Transformer, EV Charger, Fault Current & more
Electrician Hour Log
Track your apprentice or journeyman work hours with ease.
- •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
Why Choose NEC Mastery
8,000+ Questions
Exam-style questions with answers, NEC references, and detailed explanations covering all 8 chapters.
13 Exam Types
Choose from Journeyman, Master, Contractor, Inspector, and more — each with customizable chapter weightages.
Learn more →Custom Syllabus
Choose your own study plan — customize down to each individual NEC article for focused preparation.
Progress Tracking
Visual charts showing your improvement over time with performance analytics across all chapters.
Smart Mock Tests
Randomized questions with instant feedback mode, timed exams, and explanations as you practice.
Offline & Dark Mode
Study without internet. Adjustable text size and dark mode for comfortable studying anytime.
Certifications Covered
Who Is This App For?
Study by NEC Chapter
Join Thousands of Electricians
Download NEC Mastery and start preparing with confidence for your NEC certification exam.