No as far as i know no one has been electrocuted but that is not the way to look at it. The installation is also probably recent. Actually you bloody well would feel 30/40 volts, I used to have a 24 V transformer with DC and AC outputs, I could not feel the DC but could easily feel the AC, I would imagine 30/40 volts is very easy to feel, of course it's one thing running it from one finger to the other in the same hand and another to run it from one hand to another, like i said circumstances can be many hence to logic of a safety device is "never say never"