NEC Code Explorer

Navigate the National Electrical Code with AI-powered explanations, practical examples, and interactive tools. Our comprehensive coverage helps you understand not just what the code says, but why it matters and how to apply it correctly.

Most Referenced Code Sections

Browse by NEC Article

General Requirements

• Article 100 - Definitions
• Article 110 - Requirements for Electrical Installations

Wiring and Protection (200-299)

• Article 200 - Use and Identification of Grounded Conductors
• Article 210 - Branch Circuits
• Article 215 - Feeders
• Article 220 - Branch-Circuit, Feeder, and Service Calculations
• Article 225 - Outside Branch Circuits and Feeders
• Article 230 - Services
• Article 240 - Overcurrent Protection
• Article 250 - Grounding and Bonding
• Article 280 - Surge Protective Devices

Wiring Methods and Materials (300-399)

• Article 300 - General Requirements for Wiring Methods
• Article 310 - Conductors for General Wiring
• Article 312 - Cabinets, Cutout Boxes, and Meter Socket Enclosures
• Article 314 - Outlet, Device, Pull, and Junction Boxes
• Article 320 - Armored Cable (Type AC)
• Article 330 - Metal-Clad Cable (Type MC)
• Article 334 - Nonmetallic-Sheathed Cable (Types NM and NMC)
• Article 358 - Electrical Metallic Tubing (Type EMT)

Equipment for General Use (400-499)

• Article 400 - Flexible Cords and Flexible Cables
• Article 404 - Switches
• Article 406 - Receptacles, Cord Connectors, and Attachment Plugs
• Article 408 - Switchboards, Switchgear, and Panelboards
• Article 430 - Motors, Motor Circuits, and Controllers
• Article 440 - Air-Conditioning and Refrigerating Equipment

Search Features

Quick Code Lookup

Use our intelligent search to find code sections by:

• Section Number: "250.122", "210.52(C)", "Table 314.16(A)"
• Keywords: "kitchen outlets", "grounding conductor", "box fill"
• Application: "residential GFCI", "motor disconnect", "service grounding"

Advanced Filters

• Code Version: NEC 2020, 2023, or local amendments
• Application Type: Residential, Commercial, Industrial
• Complexity Level: Basic, Intermediate, Advanced
• Article Category: Wiring, Protection, Equipment, Special Occupancies

Interactive Features

AI-Powered Explanations

Every code section includes:

• Plain English Summary - What the code requires in simple terms
• Why It Matters - Safety and practical reasons behind the requirement
• Common Applications - Where you'll encounter this code in real work
• Related Sections - Cross-references to connected requirements

Practical Examples

• Calculation Walkthroughs - Step-by-step examples with real numbers
• Installation Scenarios - Common situations where the code applies
• Violation Examples - What NOT to do and why
• Best Practices - Professional tips beyond minimum code compliance

Integrated Tools

• Live Calculators - Embedded tools for relevant calculations
• Code Comparison - See changes between NEC versions
• Bookmark System - Save frequently referenced sections
• Print Optimization - Clean layouts for offline reference

Recent Updates (NEC 2023)

Major Changes

• Article 210.12 - Expanded AFCI requirements
• Article 250.68 - Grounding electrode conductor connections
• Article 314.16 - Updated box fill calculations
• Article 406.12 - Tamper-resistant receptacles

New Requirements

• Enhanced cybersecurity provisions for smart electrical systems
• Updated requirements for energy storage systems
• Revised rules for electric vehicle supply equipment

Study Guides

Exam Preparation

• Journeyman Exam Focus - Most tested code sections
• Master Electrician Topics - Advanced calculations and design
• Inspector Essentials - Common violations and enforcement

Quick Reference Cards

• Grounding & Bonding - Article 250 essentials
• Branch Circuit Requirements - Article 210 summary
• Box Fill Guidelines - Article 314.16 charts

This NEC Code Explorer is continuously updated to reflect the latest code requirements and interpretations. All content is reviewed by licensed electrical professionals and updated with each code cycle.