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.
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
Certifications Covered
- Commercial Electrical Inspector
- Journeyman Electrician
- Electrical Contractor
- Electrical Plans Examiner
- National Standard Journeyman Electrician
- National Standard Journeyman Sign Electrician
- National Standard Low Voltage Technician
- National Standard Maintenance Electrician
- National Standard Master Electrician
- National Standard Master Sign Electrician
- National Standard Residential Electrician
Why Choose NEC Mastery
- 8,000+ exam-style questions with answers, NEC references, and detailed explanations
- 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
- Topic-based learning to focus on specific NEC categories
- Smart test algorithm with randomized questions
- 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, and Industrial Electricians
- Electrical Contractors and Business Owners
- Inspectors and Safety Managers
- Electrical Engineers and Project Managers
- Maintenance Supervisors and Field Technicians
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Join thousands of electricians who have passed their NEC exams with NEC Mastery. Download now and start preparing with confidence.
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