# NEC Mastery — 8000+ Questions & Explanations

> Electrician exam prep, NEC code reference, and job hour tracker. (iPhone/iPad app by Webrich Software Limited.)

- Source: https://appshunter.io/ios/app/nec-mastery/id6720711044 (this page in markdown: same URL + `.md`)
- Developer: [Webrich Software Limited](https://appshunter.io/developer/290203591)
- Category: Education, Reference
- Price: Free with in-app purchases
- Rating: 4.80/5 from 160 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 16 · 75 MB
- Languages: American English
- Released: 2024-10-02
- Data updated: 2026-08-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/nec-mastery/id6720711044/reviews.md

## What is NEC Mastery?

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

Privacy Policy: https://www.webrichsoftware.com/privacy.html
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Join thousands of electricians who have passed their NEC exams with NEC Mastery. Download now and start preparing with confidence.

## Key features

- 8000+ exam-style questions
- 20 NEC calculators
- Quick reference guide
- Electrician hour log
- 2023/2024 NEC Code updates
- Customizable study syllabus
- Mock tests and performance tracking

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Full Question Bank | $24.99 | per 3 months |
| Full Question Bank | $59.99 | per year |
| Full Question Bank | $39.99 | per 6 months |
| Full Question Bank | $9.99 | per month |


## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/nec-mastery/id6720711044/reviews.md

### 5/5 — Awesome app and field toolkit

*2026-07-05*

I cant praise this app enough - it has got everything for anyone who wants to go on their journey to be an electrician, starting with your exam prep for all kinds of exam to calculators, quick reference tools and utilities, it has got you covered. All you need is just this app.

### 3/5 — Its better than nothing

*2025-09-18*

Would give 4 stars but as someone already pointed out if you pay attention the biggest answer is always the correct answer.  Just pick the longest answer and you will get it right every time.  You can still use this app to associate questions with the chapters in the nec code book which is useful

**Developer response:** Hi, thank you for your feedback! We really appreciate you taking the time to share your experience. We’ve worked hard over the past few months to completely overhaul the question data and improve overall accuracy. We hope you’ll find the updated version much more balanced and helpful. Not only that — we’ve also added an extensive customized syllabus selection feature to make your study experience more personalized. Please give it a try — your input helps us keep making the app better!

### 3/5 — Very good questions and info, but

*2025-03-05*

The answers to the questions are almost always the longest of the multiple choice answers.

**Developer response:** Hi, thank you for your feedback! We really appreciate you taking the time to share your experience. We’ve worked hard over the past few months to completely overhaul the question data and improve overall accuracy. We hope you’ll find the updated version much more balanced and helpful. Not only that — we’ve also added an extensive customized syllabus selection feature to make your study experience more personalized. Please give it a try — your input helps us keep making the app better!

### 5/5 — User-Friendly and Cọmprehensive

*2025-02-20*

NEC Electrician Exam Prep Pro simplifies the studying process with its user-friendly layout and cọmprehensive content. I love the flashcards feature, which is great for quick revision. The app is clearly designed with students in mind, making it easier to absorb essential information. I’m feeling much more confident about my upcọming exam!

### 5/5 — Cọmprehensive and User-Friendly

*2025-02-17*

This app covers a vast array of NEC topics, making it incredibly useful for exam prep. The user interface is clean and easy to navigate, allowing me to focus on my studies without distractions. I appreciate the performance tracking features as well!

### 5/5 — Essential Tool for NEC Exam Success

*2025-02-16*

NEC Electrician Exam Prep Pro has been a game changer for my study routine. The practice questions are well-structured and closely mimic the actual exam format. The detailed explanations help clarify concepts. Highly recọmmend this app for any aspiring electrician!

### 5/5 — Well made NEC app

*2024-12-15*

This app has been very well made and I enjoy using it, however within just a few uses I’ve figured out the majority of the time the correct answer is the longest option within A,B,C or D so I would recommend finding ways to make it a bit more difficult as I can easily get the answers correct to things I do not know without looking them up so to the correct answer being obvious

**Developer response:** Hi Lewis, Thanks for the feedback. Our data team will surely work on this. However it will take some time given the amount of work involved.

### 5/5 — Huge help for my study

*2024-10-21*

Am at a stage where I am reading NEC code book and other reference books page by page. Downloaded quite a few apps and one of them is this. I found this to be the best as its extensive and easy to use.

**Developer response:** Thanks for the positive review. Please let us know if you would like any features to be added.

### 5/5 — Extensive and clean

*2024-10-16*

Plenty to practice in a clean app. No nonsense app. To the point without confusing features like other apps.

**Developer response:** Thanks for the positive review. Please let us know if you would like any features to be added.

### 5/5 — Great content and presentation

*2024-10-07*

Love the app. 8000 and more questions is a lot to practice! I wish they had the book sections too :-)

**Developer response:** Thanks for the positive review. Please let us know if you would like any features to be added.

## Frequently asked questions about NEC Mastery

### What does the NEC Mastery app do?

This app is designed to help electricians prepare for various certification exams by providing over 8,000 practice questions with detailed explanations. It also includes a quick reference guide with essential electrical formulas and tables, and 20 professional NEC calculators for on-the-job calculations.

### What are the key features of NEC Mastery?

Key features include a vast question bank covering multiple electrician roles, 20 NEC calculators for common calculations like voltage drop and conduit fill, a comprehensive quick reference guide with formulas and tables, and an electrician hour log for tracking work hours with PDF export.

### How much does NEC Mastery cost?

The app is free to download and offers in-app purchases. This likely means some core features are free, while others, such as access to all questions, advanced calculators, or specific exam modules, may require a purchase.

### What electrician exams does this app cover?

The app covers exams for Master & Journeyman Electricians (F16, F17, G17, T17), Residential Electricians (F18, G18, T18), Maintenance & Sign Electricians (F19, F21, F22, F23), Electrical Contractors (F49), and Inspectors & Examiners (E1, E2, E3), among others.

### Can I use the calculators offline?

Yes, the quick reference guide, which includes many essential electrical formulas and tables, is available offline. While the description doesn't explicitly state offline access for all 20 calculators, the emphasis on a 'pocket electrician's reference' suggests significant offline functionality.

## Version history (last 5 releases)

### 51 — 2026-08-19

Bug fixes related to cloud sync

### 50 — 2026-07-20

Question banka corrections

### 49 — 2026-06-15

• 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.

### 48 — 2026-05-17

Bug fixes

### 47 — 2026-05-12

Bug fixes

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*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 2026-08-20.*