What types of load calculations are covered in Article 220 of the National Electrical Code?

Article 220 of the National Electrical Code (NEC) provides comprehensive guidelines on load calculations essential for safe and effective electrical system design. It specifically addresses branch-circuit loads, feeder loads, and service loads, making it crucial for ensuring that electrical systems can handle the demands placed on them by various equipment and appliances.

Understanding these calculations is fundamental because each type of load serves a specific function in an electrical installation. Branch-circuit loads refer to the power requirements for individual circuits supplying power to outlets and devices. Feeder loads involve larger wiring systems that support multiple branch circuits, ensuring that an adequate supply of electricity is distributed efficiently. Service loads refer to the overall power supply entering a building, which influences service entrance equipment sizing and protection devices.

This coverage ensures that electrical contractors are well-prepared to design systems that adhere to the NEC's safety and technical standards, reducing the risk of overloads and enhancing overall system reliability.