Master the National Electrical Code
Your complete NEC toolkit — exam prep with 8000+ practice questions, 20+ electrical calculators, quick reference tables, and hour logging for electricians and electrical professionals.
Why Choose NEC Mastery?
Everything you need to master the National Electrical Code — from exam prep to on-the-job tools.
8000+ Practice Questions
Comprehensive question bank covering all NEC chapters with detailed explanations referencing specific code sections.
Chapter-Wise Study
Organised into 9 topics matching the NEC chapter structure. Study exactly what you need for your exam.
20+ NEC Calculators
Free online tools for wire sizing, voltage drop, conduit fill, load calculations, motor circuits, and more.
Quick Reference
13 categories of NEC tables, formulas, ampacity charts, and code references at your fingertips.
Electrician Hour Log
Track apprentice and journeyman work hours with dashboard charts, PDF export, and iCloud sync.
Mobile App Available
Study anywhere with our iOS app. Includes progress tracking, weighted mock exams, flash cards, and offline access.
Built for Your Specific Exam
13 exam types with customizable chapter weightages — your mock tests match the real thing.
Journeyman Electrician
PopularThe most common electrical license exam covering all aspects of commercial and residential electrical work.
National Standard Master Electrician
PopularAdvanced certification for experienced electricians seeking master-level licensure with emphasis on code compliance.
Electrical Contractor
PopularFor electricians seeking contractor licensure, covering project management and comprehensive code knowledge.
Tools for the Field & the Exam
Go beyond practice questions with calculators, reference tables, and hour tracking built for working electricians.
NEC Calculators
20+ free tools across 9 categories — wire sizing, voltage drop, conduit fill, load calculations, motor circuits, grounding, and more.
Browse CalculatorsQuick Reference
13 categories with 100+ reference items — formulas, ampacity tables, conduit fill charts, grounding specs, NEMA configs, symbols, and more.
Browse ReferencesElectrician Hour Log
Track apprentice and journeyman work hours with 12 work categories, dashboard charts, goal tracking, PDF export for state boards, and iCloud sync.
Learn MorePractice by Chapter
Choose a chapter to start practising. Each topic includes free questions you can try right now, plus thousands more in the app.
Chapter 1
Definitions
Essential definitions used throughout the NEC, including terms for circuits, equipment, grounding, and wiring methods that form the foundation of electrical code interpretation.
Chapter 1
General Requirements
Fundamental requirements for electrical installations including examination of equipment, installation and use, spaces about equipment, and electrical connections.
Chapter 2
Wiring and Protection
Requirements for branch circuits, feeders, services, overcurrent protection, grounding, and surge protection to ensure safe electrical distribution.
Chapter 3
Wiring Methods and Materials
Covers conductor types, cable assemblies, raceways, boxes, conduit bodies, and fittings used in electrical installations.
Chapter 4
Equipment for General Use
Installation requirements for switches, receptacles, lighting, appliances, motors, transformers, and other common electrical equipment.
Chapter 5
Special Occupancies
Electrical requirements for hazardous locations, healthcare facilities, assembly occupancies, theaters, carnivals, marinas, and agricultural buildings.
Chapter 6
Special Equipment
Requirements for electric signs, manufactured buildings, swimming pools, solar PV systems, generators, fire pumps, elevators, and electric vehicle charging.
Chapter 7
Special Conditions
Covers emergency systems, legally required standby systems, optional standby systems, interconnected electric power production sources, and energy storage systems.
Chapter 8
Communications Systems
Requirements for communications circuits, radio and television equipment, CATV systems, network-powered broadband, and premises-powered broadband.
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