Which of the following are common sizes of conductors used in commercial buildings?

The selection of common sizes of conductors for commercial buildings frequently centers around the requirements for electrical load and the appropriate wiring for various applications. In commercial settings, conductors are generally chosen based on the power demands of the equipment that will be used.

The answer indicating 12 AWG, 10 AWG, and 8 AWG is notable because these gauge sizes are commonly used for branch circuits in commercial buildings. Specifically, 12 AWG is typically suitable for lighting and general purpose circuits, while 10 AWG is often employed for slightly higher load applications, and 8 AWG can be used for even more demanding circuits, such as those supplying larger equipment.

This combination provides a range of options for different load requirements, ensuring that the wiring can handle the necessary current without overheating or posing a safety risk. These sizes meet the National Electrical Code (NEC) recommendations, which are vital for ensuring safe and compliant electrical installations in commercial settings.

In contrast, the other sets of gauge sizes either focus on residential applications or do not align with typical commercial needs, making the chosen answer the most appropriate for the context of the question.