A #12 rubber covered copper wire's maximum ampacity is what?

For a #12 rubber-covered copper wire, the maximum ampacity is indeed 20 amps. Ampacity refers to the maximum amount of electric current a conductor or device can carry before sustaining immediate or progressive deterioration. The National Electrical Code (NEC) provides guidelines on the ampacity for various wire sizes based on insulation type, ambient temperature, and installation conditions.

In the case of a #12 wire specifically, standard ampacity ratings indicate that under typical conditions, it can safely carry up to 20 amps. This rating ensures that the wire operates efficiently without overheating, which can lead to potential safety hazards such as electrical fires or equipment damage.

While other choices represent ampacity ratings for different wire sizes or types, 20 amps is the standard and recognized capacity for a #12 rubber-covered copper wire in most residential and commercial wiring applications. Understanding this is crucial in ensuring compliance with electrical codes and maintaining safety in electrical systems.