50v at 100a will still give you quite an arc, perhaps more that "dry hands" will handle. I saw a guy melt a wedding ring, permanently scarring his finger at 1.5v.
Gfretwell. No it wont, but if you mean a 100A circuit the available fault current is probally much higher (Depends on the source) lets guess around 2000A, that will make some fireworks.
