Dual Control Switch is defined as?

• A. A power-operated switch also equipped for hand operation.
• B. A switch that can only be operated by hand.
• C. A remotely controlled turnout with no manual operation.
• D. A fixed switch with no control.

Answer: (A)

A dual control switch is a switch that can be operated by power from the remote or automatic control systems, and also has a manual hand operation option at the switch stand. The idea is that the switch can be set remotely, but if the electrical or control system is unavailable or you need to operate it locally for inspection or maintenance, you can still move it by hand. That combination of motorized/remote capability with manual override is what defines it.

If a switch were only manual, it wouldn’t be dual control. If it were remotely controlled with no manual option, it wouldn’t have the manual capability needed in some situations. And a fixed switch with no control isn’t operable at all.