Maintenance procedures, LOTO, PPE, qualified, etc is the domain of the plant management, and probably their insurance company.
Plant safety procedures vary, from 'almost non-existant' to 'the full boat'. Those that are lax usually swing to the correct course upon a visit from either OSHA, or their insurance carrier.
A few of the safety seminars I have been to, require a voltage test to assure mechanical equipment is 'safe', even with LOTO procedures in place. Full 70-E, moon suit and all. That is the 'Perfect World'!!
Now, return to the 'real world' that quite a few of us live in. The scenario goes like you said, 'Task Qualified' mechanic. LOTO, push the 'on' button, no function, go to work.