My home was built in 1945. The wiring has been replaced in most of the house but some sections still contain cabling with only two wires in them. Black(hot) and white (neutral?). I need to install a structured media centre to handle some cat 6 cables and tidy up what my phone and Internet service provider wants to install. I installed a Leviton 47605-28w box. I have fed the two wire cable into a plastic gang box at the base of the SMC. The SMC is inside the house and is mounted on an exterior wall. The homes grounding rods are on the opposite side of this wall (less than 5'away). Is there a safe and legal way to ground the outlet and the SMC without having to install new cabling ( way too much drywall to remove) or run it all the way back to the main panel? Thank you.