Home Inspection Electrical Practice Test

The minimum conductor size for feeders and branch circuits is determined by the National Electrical Code (NEC) requirements to ensure safe and effective electrical systems. In residential wiring, the correct minimum sizes are 14 AWG for copper conductors and 12 AWG for aluminum conductors. These sizes are suitable for general lighting and receptacle circuits, which are typically rated for lighter loads.

Using the appropriate conductor size is crucial for preventing overheating and ensuring proper circuit operation. If the conductor size is too small for the load it carries, it can lead to excessive voltage drop and increase the risk of fire hazards. The specified sizes for both copper and aluminum in this option ensure a reliable electrical system that complies with safety standards.

The other options suggest larger or different sizes that would be unsuitable for standard branch circuits, leading to potential safety violations if applied in typical residential settings. Therefore, 14 AWG copper and 12 AWG aluminum reflect the minimum requirements that properly match typical applications in home electrical systems.