The most you will ever be around is 13,200 V. Even that we are not allowed to go anywhere near if its hot. Per OSHA rules we are not allowed to work on anything that is hot.
That being said, 24V is a a nasty tingle, 120v makes me throw my screwdriver behind me, and 277v made my hand go numb for a few hours. The 24v was supposed to be disconnected by the inhouse guys that obviously didnt do their job, 120v has only be experienced at home doing things I know better than to do, and the 277v was due to another journeyman not doing their job correctly and me getting the surprise of their ineptness. I have been very lucky in that the 120 and 277 have only gone in and out the same hand/arm. When I was hit with the 277v I may have let out a string of obscenities that I shouldnt have, but it got the point across.
I have had 120v and 277v wiring and devices blow in front of me. Not exactly fun times. More often than not you have to watch for things the other trades do that cause issues. A lot of it is just not knowing what they are messing with by moving it or some how damaging it.
Overall it is fairly safe if you pay attention. If you get in and some how end up with the same contractor and on the same job as I am, I will do my best to pass on what I can on the job. Some things just cant be taught outside of the job. I dont get to pick my apprentice when I have one, well sometimes they give me a choice but is usually because nobody else wants either one.
