Question

this is an essential safety procedure that protects workers from injury while working on or near electrical circuits and equipment by locking the device and/or power source to prevent anyone from turning on the hazardous power sources while someone is performing maintenance or servicing work:
select the best option.
shutdown
lockout/tagout
closeout
if you need to review this content, it can be found in the lockout/tagout module of the avoiding electrocution hazards (construction) topic.
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Explanation:

The question describes a safety procedure that locks devices/power sources to prevent accidental activation during maintenance. "Lockout/Tagout" is a standard safety procedure for this purpose, while "Shutdown" is a general power - off and "Closeout" is about project completion, not matching the described procedure.

Answer:

B. Lockout/Tagout