What is the focus of NEC Article 220?

The focus of NEC Article 220 is on branch circuit, feeder, and service calculations. This article provides guidelines and requirements for properly calculating the electrical loads that must be supported by branch circuits, feeders, and service conductors in a building or facility. By ensuring that these calculations are done correctly, electrical systems can be designed to handle the expected loads safely and efficiently, preventing potential overloads and ensuring the reliability of the electrical distribution system.

Understanding the loads involved is crucial for proper sizing of conductors and equipment, which helps ensure safety and compliance with electrical codes. This article addresses factors such as demand factors, diversity factors, and maximum demand, which are all essential for conducting accurate load calculations. Therefore, the correct answer reflects the comprehensive nature of calculations required for planning electrical installations in accordance with the NEC standards.