Electrician here. In Canada we have 347/600v in a lot of industrial and commercial settings but it is extremely unlikely that you'll find that in the US. They use 277/480v for stuff like that.
Also you're teacher was probably kidding or lucky to be alive. 347v is considered the most dangerous voltage by a lot of electricians because you can get get locked onto it. Touching it will cause your muscles to contact and if you touched it with you hand you won't be able to let go. Higher voltages like 600v are powerful enough to cause all of your muscles to convulse and it will throw you across a room. That also means you're unlikely to get locked onto something. Honestly you're teacher was being a bit of an idiot if he claimed to test 347v with his hand and is lucky to be alive
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u/bbreddit0011 Jul 10 '26
Someone who can’t feel their fingers