What is the purpose of the devices labeled "F SW" on the illustrated switchboard drawing? See illustration EL-0003.

Question

Accepted Answer

to select which alternator frequency is to be displayed on the frequency meter

Answer

to determine the individual frequencies of each leg of a three phase alternator output to be displayed on the frequency meter by selective switching

Answer

to determine the difference between the individual frequencies of each leg of the three phase alternator output to be displayed on the frequency meter by selective switching

Answer

to determine the average frequency of individual frequencies of each leg of a three phase alternator output to be displayed on the frequency meter

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