Electrical circuits must be locked-out/tagged-out before electricians work on any equipment. Is this true or false?

True

Explanation:

A locked/tagged out procedure is used to ensure the equipment is turned off and it can't be turned on without permission, this ensures the electricians will work safely because there won't be electricity running in the equipment.

I hope you find this information useful and interesting! Good luck!

true. this way they don't get shocked or electrocuted.