Maintenceguy,

If you want to, You should ask the inspector what code section he is quoting. Here in NJ the DCA states that every inspection that fails, we must (as inspectors) quote the NEC, chapter and verse, where and why we fail a job. I can agree with sparky that a plastic plate might be required IF the box is plastic, it is an old 2 wire RX (NO GROUND WIRE), and there is metal plates.