[Ron Ramirez]

It's not a bad idea, as long as your wiring is correct and up to code. Of course the cord will not look authentic, but if you're looking to have an easy ground for your transformer-operated radio, this would do the trick (again, assuming your house wiring is up to code).

Do not add a three wire grounded AC cord to a transformerless(AC-DC) set. Even if the B- is floating (not connected directly to the chassis), don't do it.