I believe that AC is way more dangerous than DC, and particulary the low frequency (50-60 Hz) that are used on normal mains, once upon a time lighting in tunnel

I believe that AC is way more dangerous than DC, and particulary the low frequency (50-60 Hz) that are used on normal mains, once upon a time lighting in tunnels (during excavation) was through a frequency converter that elevated frequency (i.e. essentially making AC more similar to DC): https://news.ycombinator.com/item?id=20736124 https://news.ycombinator.com/item?id=20736124 According to: https://www.allaboutcircuits.com/textbook/direct-current/chpt-3/physiological-effects-electricity/ https://www.allaboutcircuits.com/textbook/direct-current/chp... A DC shock may stop the heart (which once the contact is broken is easier to restart) whilst AC males it fibrillate, and there is the "tetanic" reaction induced by AC that in many case might make the contact last longer or be impossible to break. The old, basic rule is - in case of doubt if a wire is live - to touch it first with the back of a finger, and never with a fingertip, as the reaction to the shock would be to close the finger/hand around the wire in a very tight grip.