Define the term "load calculation."

Load calculation refers to the systematic process of determining the total electrical load that a system must support. This involves assessing all the electrical devices, appliances, and systems that will draw power from the electrical supply, taking into account their operational characteristics and usage patterns.

Understanding the total load is critical for the proper sizing of electrical systems, ensuring that components such as circuit breakers, wires, transformers, and panels are appropriately rated to handle the expected demand. Proper load calculations also help prevent overloading, which can lead to overheating and potential hazards.

This concept is fundamental for electricians and electrical contractors, as it forms the basis for the design of efficient, safe, and reliable electrical installations. Other options mentioned, such as measuring voltage or counting devices, do not encapsulate the comprehensive assessment that load calculation entails.