NEC Code Studio & Tools
Electrical Code Visuals& Tools
$5.99
New in v3: search all 165 diagrams instantly, jump back to recently viewed illustrations, share any diagram, and calculate residential service loads.
This app is a visual reference library for electricians, electrical engineers, inspectors, and students — covering the National Electrical Code from the utility service entrance all the way to branch circuits and special systems.
Browse 165 hand-picked illustrations organized into 11 categories: Distribution Systems, Service Entrance, Panel Layouts & Schedules, Wiring Diagrams & Floor Plans, Grounding & Bonding, Overcurrent & Motor Circuits, Load Calculations, Low Voltage & Special Systems, Safety & Code Compliance, Fire Alarm Systems, and Building Automation.
Search Illustrations
Find any diagram instantly across all 11 categories. Search by title, topic, or NEC article — results appear as you type.
Recently Viewed
Your viewing history appears at the top of Browse so you can pick up right where you left off. No hunting through categories to find a diagram you were just studying.
Share Any Illustration
Send any wiring diagram, riser, floor plan, or code reference directly from the gallery to colleagues, students, or inspectors.
Residential Load Calculator (NEC Article 220)
Calculate service load the standard NEC method — general lighting, small appliance and laundry circuits, large appliances, HVAC, and optional loads all in one place. Results update live as you type, with automatic demand factor application, service size recommendation (100A–400A), and conductor sizing for the hot, neutral, and grounding electrode conductor.
NEC Reference Requirements
Plain-English summaries of key NEC requirements organized by chapter — from working space clearances and conductor terminations to GFCI protection, grounding, and equipment installation rules. Search by article number or topic to find what you need in the field, fast.
Illustration viewer features:
Swipe left and right to flip through illustrations within any category. Pinch to zoom in for fine detail and pan while zoomed. Double-tap to zoom in, double-tap again to reset. Bookmark any illustration as a favorite for quick access.
Works on iPhone and iPad. Full Dark Mode support.
A practical field and study companion for anyone working with the NEC.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Version 3.0 adds four significant new features:
Search — Find any of the 165 illustrations instantly by typing a title, category, or NEC topic. Results appear across all 11 categories as you type.
Recently Viewed — A history strip at the top of Browse lets you return to illustrations you were studying with a single tap.
Share — Send any diagram directly from the gallery to a colleague, student, or inspector using the share button in the toolbar.
Five new illustrations have been added to the Service Entrance, Panel Layouts, Wiring Diagrams, Load Calculations, and Low Voltage categories.
The NEC Article 220 residential load calculator and the NEC Reference Requirements tab (added in 2.0) remain fully intact.
The developer, Yuhsiu Lai, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yuhsiu Lai
- Size
- 517.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 iTech
