I learned the basics of this the hard way (most memorable way). If you pull an outlet that is in a circuit that is under a load upstream of the pulled outlet, logic says the black wire will fry you. Well, the white (neutral)wire will bite too!! Maybe not as hard, but it will bite. Now, if the ground wire is tied to the white, any current going to ground will energize both wires. If the appliance (and you) offer the best ground.....zzzzzzzzzzzap!!