Hi, Maybe this is a stupid question, but I've been wondering about this all day. In my book, they only explain the isolation transformer really brief. As far as I understand, the main of the transformer has a neutral which is grounded, if you touch that, the current will flow through you (you act as the ground). Now the secondary of the transformer isn't referenced to ground, so if you touch one wire, there will be no current. This is the part I don't understand... How come no current will flow?