What calculations are detailed in Article 220?

Article 220 of the National Electrical Code (NEC) specifically focuses on branch-circuit load calculations. This article provides guidelines for determining the amount of load to be connected to branch circuits, which is essential for proper sizing of conductors, overcurrent devices, and for ensuring the safety and reliability of electrical systems.

Understanding branch-circuit load calculations is critical for electricians as it helps prevent overload conditions that can lead to overheating and potential fires. Proper calculations ensure that the installed electrical system can handle the demand placed on it by devices and loads without risking the integrity of the system.

The other choices pertain to different aspects of electrical calculations. Overcurrent calculations revolve around the protective devices and their ratings. Feed load calculations generally concern the assessment of total loads served by feeders. Grounding calculations deal with ensuring that electrical systems have appropriate grounding to mitigate hazards. Each of these areas is important in electrical design but falls under different sections of the NEC, with Article 220 explicitly detailing the branch-circuit load calculations.