If the NC Stop PB switch is held open (depressed), activating (closing) the NO Start PB switch will not initiate the control function: the circuit is disabled.
This method of control lockout (referred to as ________________ switching) is often used to prevent a 3-phase AC motor from being started during a process cycle.
A) locked-stop
B) locked-start
C) none of the answers
D) unlocked-stop
Show Answer
Answer:A
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