单选题As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.Adraw a one line diagram of the circuitryBtest all fuses and measure the line voltageCtake megger readingsDinsulate the apparatus from ground
单选题
As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.
A
draw a one line diagram of the circuitry
B
test all fuses and measure the line voltage
C
take megger readings
D
insulate the apparatus from ground
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