Quote Originally Posted by yebo
flow of electrons is from negative to positive, but convention (whatever that is, must have been a group of weirdo scientists) says that imaginary "positive charges" flow from positive to negative. ang gulo nila ehehehe!
Engineers like to think in terms of "Positron Flow", while technicians like to remain aware that it is the electrons that actually do the flowing.

The reason behind the so called "convention" is because Engineers and Scientists find it easier to deal with "positive" numbers.

Nevertheless, the question has nothing to do with how electricity flows. The main thing is to avoid that flow altogether, regarldess of what direction it takes. Obviously, un-grounding the power supply first provides that measure of safety.