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As someone else mentioned, that's a lockout-tagout procedure. Very common when doing any kind of maintenance on a machine. You isolate the power sources and p

As someone else mentioned, that's a lockout-tagout procedure. Very common when doing any kind of maintenance on a machine. You isolate the power sources and place a personal lock on it to which only you have the key. It usually has your name and an ID number written on it. The lock cannot be removed by anyone else. If you, for instance, forget to take your lock off and go home, it's a very long process where they have to get someone high enough up the chain to get in contact with you and either get you to come back or confirm that you're safely a long way away from the machine before they can cut the lock off. This makes your management very unhappy and most places that I've worked will write you up for leaving while the equipment is still locked out if maintenance is finished and it's safe to operate. It's not only electricity that needs to be isolated and locked out. A lot of machines use air pressure to operate moving parts, so in that case you'd have to isolate all electrical sources as well as the air. The machines I usually mess with require 2 locks. Some of the machines I've seen can require 6 or more locks to be fully locked out and safe to work on.

zentiggr 5y ago
When I served on a submarine, tagout procedures were followed to the letter. A typical maintenance period might require 100 or so separate tagouts, each of which could require anywhere from one to dozens of tags. Each duty watch was required to show up early enough to go through the entire tagout book and at least know the gist of what was in progress. Finding a loose tag was an automatic all hands all work stoppage, until it was tracked down and resolved. No questions, even if your work was in a different compartment, or had no logical connection to what he tag was for. Each new tagout request had to be signed off on by at least three people, sometimes all the way up to the captain and not just a foreman or supervisor but one or more shop heads. Seawater system tagouts on a floating sub were serious business.

zentiggr 5y ago

When I served on a submarine, tagout procedures were followed to the letter. A typical maintenance period might require 100 or so separate tagouts, each of which could require anywhere from one to dozens of tags. Each duty watch was required to show up early enough to go through the entire tagout book and at least know the gist of what was in progress. Finding a loose tag was an automatic all hands all work stoppage, until it was tracked down and resolved. No questions, even if your work was in a different compartment, or had no logical connection to what he tag was for. Each new tagout request had to be signed off on by at least three people, sometimes all the way up to the captain and not just a foreman or supervisor but one or more shop heads. Seawater system tagouts on a floating sub were serious business.