Cisco 648-247 Free Exam Question 1

When a 24 VDC fail safe lock is being used to secure a door, how should power be supplied to the lock from the control source?

Options

A. connected +24 VDC directly to the lock
B. connected +24 VDC through common and normally close
C. connected +24 VDC through common and normally open
D. connected +5 VDC binary control signaling

Correct Answer: B
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