True or False: A main breaker is not required for a subpanel if over-current protection is provided for the feeder conductors.

The statement is true because a main breaker is not always mandatory for a subpanel if the feeder conductors supplying the subpanel have their own over-current protection devices. In electrical systems, as long as there is proper over-current protection for the conductors that lead to the subpanel, the need for an additional main breaker at the subpanel can be eliminated.

In residential settings, it is common to provide over-current protection such as a circuit breaker or fuse for the feeder conductors. This protects against overloads and short circuits. If this protection is effective and appropriately sized for the load being supplied to the subpanel, a separate main breaker at the subpanel is deemed not necessary.

In contrast, options referencing specific instances like only in commercial settings or only for smaller homes do not reflect the established electrical code principles and requirements consistently applicable to both residential and commercial installations. Overall, understanding the role of feeder protection clarifies why a main breaker may not be required in certain configurations.