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i dont think anyone is disputing that, usually in a shutdown procedure its good practise to turn off upstream and test at local isolater before locking off.I'm with Tony on this one, it's a different world working in the industrial sector. I have worked on many varied things from huge crushers and tyre shredders to furnaces, foundries and the list goes on.
It doesn't bear thinking about what could go wrong if there wasn't an extremely stringent isolation procedure in place, I have unfortunately witnessed a couple of serious injuries due to lack of safe isolation and I don't want to see another one as long as I live.
This proves two things
1. the legend is correct
2. there is not multiple supplies going ti machine.
unless you are familiar with these heavy machines you shouldn't be working alone on them for safety reasons.
how do you know there isnt a supply going into a different part of the machine that isnt interlocked?
it is not always possible to see the cables entering the machine and depending on what it is that doesn't always help if everything is wired in swa