Which article provides guidelines for calculating branch-circuits, feeders, and services?

Article 220 of the National Electrical Code (NEC) specifically addresses the calculations for branch circuits, feeders, and services. This article provides the necessary guidelines to determine the total connected load and the demand factors that must be applied to accurately size conductors and overcurrent protection devices.

By following the provisions outlined in Article 220, you can ensure that the electrical system is designed to handle the anticipated load while remaining compliant with safety standards. It covers various aspects, including load calculations for different types of occupancy, like residential and commercial, and specifies how to apply demand factors and load adjustments effectively.

This focus on load calculations is crucial for ensuring that systems are neither under nor over-designed, which can lead to inefficiency or safety hazards. Understanding Article 220 contributes to achieving a reliable and code-compliant electrical installation.