In the online textbook on the Safe Circuit Design page in the seventh paragraph, it is stated, "To help ensure that the former failure is less likely than the latter, engineers try to design appliances in such a way as to minimize hot conductor contact with the case. Ideally, of course, you don't want either wire accidently coming in contact with the conductive case of the appliance..." However, in the sixth figure the ground wire is drawn in and this puts the neutral wire at the same potential as the frame of the appliance. Now, this makes sense to me, but what doesn't make sense is why it would be a problem to just connect the neutral wire to the frame and use a polarized plug to ensure that the frame is at the neutral's (i.e. earth) potential. Is the only problem really that is circumvents any GFCI protection or are there other safety concerns?