What determines the number of branch circuits required for a residential structure?

The number of branch circuits required for a residential structure is determined primarily by the total connected load and demand calculations. This involves assessing the electrical needs of the home, which include all appliances, lighting, heating, and other electrical devices that will be used. By calculating the total load, the electrician can ensure that the electrical system is designed to handle the maximum expected usage without risk of overloading.

In contrast, while square footage, local building codes, and the number of outlets do play a role in overall electrical planning, they do not directly dictate the specific number of branch circuits required. Square footage may influence general design and layout, but it is the actual load calculations that ensure safe and efficient operation of the electrical system. Local building codes provide guidelines and minimum requirements but are based on accepted standards of load calculations. The number of outlets affects convenience and accessibility in a home but does not inherently define the circuit requirements without considering their connected loads.