When replacing modules or working on equipment controlled by the PLC installation, the safest way to proceed is to:
A)de-energize the MCR coil.
B)block open the emergency stop switch.
C)remove the fuse from the circuit.
D)pull and lock the disconnect switch.

Question

When replacing modules or working on equipment controlled by the PLC installation, the safest way to proceed is to: 
A)de-energize the MCR coil. 
B)block open the emergency stop switch. 
C)remove the fuse from the circuit. 
D)pull and lock the disconnect switch.

Quizplus · Accepted Answer

Pulling and locking the disconnect switch is the safest way to ensure that the equipment is completely de-energized and cannot be accidentally turned on while maintenance is being performed. This helps to protect both the technician and the equipment.

When Replacing Modules or Working on Equipment Controlled by the PLC