Rainboe
The risk is not really voltage related. For domestic supplies the current most likely to cause death is in the range of 0.1 amp - 1 amp, sometimes even lower currents can be fatal.
Higher currents, whilst still dangerous are less likely to upset the hearts rhythm.
(The other issue with AC is that it can cause horrendous burns, DC tends not to cause burns).
Just be careful and install earth leakage.