When the code changed and required separate neutral and ground on dryers it messed up all the delivery guys. I have seen them change the old 3 wire receptacle to a 4 wire (no ground) a 4 wire to a 3 wire, use a 4 wire cord leaving the ground loose and the bond on. Or leaving the bond on and a 4 wire cord.
And speaking of dryers, I could not count the number of dryer ckts here that were wired with 10-2 w/g even with inspectors approval, something that NEVER has been code approved.
