Which of the following calculations are included in Article 220?

The inclusion of residential, commercial, industrial service, and feeder calculations in Article 220 is significant because this article specifically outlines the requirements for calculating the load of various electrical systems. Article 220 provides guidelines for determining the demand for different facilities and ensures proper sizing of conductors and overcurrent protection devices.

By encompassing residential, commercial, and industrial services, as well as feeders, Article 220 aims to accommodate the diverse range of electrical loads and usage patterns found in different environments. Each of these categories has unique characteristics and potential load profiles, so the article is essential in ensuring safety and efficiency in electrical installations. This holistic approach enables electricians and engineers to create robust systems that can handle the anticipated loads, preventing overloads and enhancing overall reliability.

In contrast, the other options are limited in scope. They either do not cover all types of services or circuits necessary for a full understanding of load calculations according to the standards set in Article 220.