I suggest you do not let a stubburn woman woman force you to install anything not up to code. Show her an illustration of the pertaining code from the NEC handbook or from a Mike Holt book. I bet she wears a seatbelt when she drives around, because the law says so and she doesn't like getting tickets. I bet she has a driver's license. I bet she pays taxes. I bet she stops for red lights. Why let her break the law, just cause she wants something that is clearly against it?