What is the minimum size of wires that must be used for limited loads on single branch circuits?

For limited loads on single branch circuits, the National Electrical Code (NEC) provides guidelines on the minimum wire sizes to ensure safety and efficiency. In this context, the minimum size of wire that is typically used for residential and light commercial applications is based on the capacity to handle the load without overheating, while also considering the minimal voltage drop and circuit protection limitations.

Using 8 AWG copper wire for limited loads is appropriate because it is capable of carrying a higher amperage (typically up to 50 amps depending on the application) without exceeding its temperature rating, thus ensuring safety and reliability in the electrical system. This size wire is often used for circuits that may experience moderate loads, allowing for a margin of safety and reducing the risk of circuit failure.

In summary, 8 AWG copper wire is well-suited for limited load applications on single branch circuits, making it the correct choice among the options provided.