241. What is the purpose of the device labeled «Man-Auto Sw.» in the illustrated switchboard

to shift the governor control from manual to automatic/zero droop or vice versa
to shift from the automatic voltage regulator to manual voltage control or vice versa
to supply regulated control power to the switchboard
to enable the operator to read the field voltage on device "Volt. Reg. Adj. Pot." or device "Man. Volt. Adj. Rheo."

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