[two_handfuls]

I believe 50V is a safety limit.

[cptcobalt]

Below 50v is considered "low voltage". Higher voltage would require different safety considerations.

[outworlder]

And that's because of your skin resistance. Around 50V is when voltage starts to overcome it.

[rcxdude]

usually. It's very possible to get a shock off of significantly lower voltages in bad conditions (very sweaty skin, for example).