@H0H0v Also quick thing, you can work with power on in an other case, taking measures, that's all, you're not taking off wires or anything. But be sure to have the mention with the "V" for that
@H0H0v I could mention over article but I won't.
Just to make a conclusion for everyone, none of th two option is right and both are dangerous.
You should not work with power on if you aren't qualified with the mention T, and if you are, wear all of your PPE, only one won't protect you