In my book, the attitude towards safety comes first. No matter how good the workmanship is, with a poor attitude, you can kill yourself - or worse, someone else.
Get the attitude right before all else. When there are safety protocols in place - FOLLOW THEM. Don't argue or feel they are slowing you down or wasting time. They are there for a good reason. You don't have to understand the why or how they came to be, although such knowledge might be helpful - just as long as you don't try and rationalise a way around them.
Good workmanship is part of this, so you should always endeavour to be spot on with this - but a word to the wise.... If you are approaching an environment for the first time, I would suggest it to be a sensible move to not assume anything, especially if I was going to be working on it. Poor workmanship might be obvious, but it also may not. Good workmanship is still subject to issues if, for example, something has been damaged - especially when that damage is out of sight.
As for the the 600V 3 phase environment... Contact from phase to phase may not quite vaporise you - but you aren't likely to get a second chance. At that voltage and with 3 phase, the equipment is going to be drawing a significant amount of power. Get yourself in the wrong place and the power supply and equipment aren't going to suffer.
Pretty much the same for any capacitive or inductive coupling... and when you have long runs, the capacitance just increases, allowing for more current to pass. Again, these currents (if they do flow) are going to be small compared to the demands of the equipment, so their impact is not likely to be much on the installation - but they could still be large enough to give you a toe tag.
Be safe.
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