NEC Article Guide

Master Article 220 - Branch-Circuit, Feeder, and Service Calculations

Article 220 defines how to calculate electrical loads, apply demand factors, and size feeders and services correctly for residential and commercial installations.

Key Rules and Sections

Code Rule

220.12: General lighting load unit values.

Code Rule

220.14: Specific load calculations for outlets and equipment.

Code Rule

220.42: Demand factors for lighting loads.

Code Rule

220.52: Small-appliance and laundry circuit load values.

Code Rule

220.83: Optional method for existing dwelling unit calculations.

Sample Questions With Answers

No sample questions available yet for this article category.

Ready to master the NEC?

Drill category quizzes, study by NEC year, and sharpen your code recall with practical field-focused questions.

Start Practicing Free