I have fairly solid walls in my apartment (plaster?), no drywall, so when I want to hang something or put in a screw, I need to drill a hole and first put in one of those small plastic 'sleeves' to hold the screw in place. (For what it's worth, I live in Europe, so it may be my conditions are slightly different from yours).
I was wondering, how do I avoid hitting an electrical wire when I do this. I asked an electrician who did work here, and he said 'good question', but that he didn't really have an answer other than to steer clear of vertical and horizontal lines from fixtures, plugs, etc. Is there any way to detect where the lines are running? Is there anything similar to a 'stud detector' for electrical wires? I suppose it can't be that hard, since people drill into walls frequently.