Which control sends a signal to transfer the load back to commercial power?

The option "Retransfer control" is the appropriate choice because its primary function is specifically designed to manage the transition of the electrical load back to the primary power source, which is often the commercial power grid. When there is a need to switch the electrical supply back from an alternate source, such as a generator or battery, to the main power source, retransmission control sends the appropriate signal to facilitate this changeover. This ensures that the load is restored to the commercial power system safely and effectively.

In general, load sharing control is used to distribute loads among multiple generators or power sources during operation, rather than switching back to the grid. Transfer control refers to the initial switch from one power source to another but does not typically specify the return to commercial power as its function. Generator control is responsible for managing the operational parameters of the generator itself but does not handle load transfers specifically. Therefore, the function of retransferring the load back to commercial power is distinct and crucial in electrical power management.