NEC ElectricalCode Illustrated Customer Service

1. NEC ElectricalCode Illustrated Customer Service
2. NEC ElectricalCode Illustrated App Comments & Reviews (2026)

Illustrations of Electrical Code (NEC) — From Utility Service to Branch Circuits
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 — Site plans, ring bus diagrams, and voltage distribution systems
Service Entrance — Overhead and underground service, utility pole connections, and clearance requirements
Panel Layouts & Schedules — Residential and commercial panel diagrams and load schedules
Wiring Diagrams & Floor Plans — Residential floor plans, schematic wiring diagrams, and rough-in illustrations
Grounding & Bonding — Electrode systems, bonding diagrams, ground-fault return paths, and NEC Article 250 references
Overcurrent & Motor Circuits — Motor branch circuit protection, conductor sizing, and fault current diagrams
Load Calculations — Conductor sizing flowcharts, demand tables, and voltage drop formulas
Low Voltage & Special Systems — NEC Article 725, CCTV, access control, intercom, and integrated LV systems
Safety & Code Compliance — Inspection checklists, permit flowcharts, and building code references
Fire Alarm Systems — Riser diagrams, wiring topologies, zone layouts, and sequence of operations
Building Automation — BACnet/IP, BMAS overviews, HVAC control flowcharts, and ventilation diagrams

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, 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.
Features:

Swipe left and right to flip through illustrations within any category
Pinch to zoom in for fine detail — 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.

NEC ElectricalCode Illustrated App Comments & Reviews