Which article deals with both branch-circuits and feeders?

Article 220 of the National Electrical Code (NEC) specifically addresses branch circuits and feeders, providing essential information about calculating the demand loads for various systems. This article outlines the requirements for load calculations that are necessary to ensure that electrical systems, including service and subservice loads, are designed appropriately for both residential and commercial installations.

The provisions described in Article 220 offer guidance on how to determine the proper sizing of feeders and branch circuits to handle anticipated loads effectively. This promotes safety, ensures efficiency, and helps prevent overloading, which could lead to circuit failures or fire hazards. Understanding these requirements is crucial for electrical professionals when designing or evaluating electrical systems.

In contrast, the other articles focus on different aspects; Article 210 deals specifically with branch circuits only, Article 225 discusses outside feeders and branch circuits, and Article 200 is concerned with the general requirements for conductors, which does not specifically include both branch circuits and feeders. Therefore, Article 220 is the correct reference for both categories.