Does anyone know what's usually the maximum size hole you can drill in a load barring wall and for a non load bearing wall? I was wondering what's an economical conduit to run for structured wireing. I saw a blue plastic conduit at the home depot that was about $30 per 100ft for 3/4" and there's also a 1/2" 200ft roll. Is it easy to fish cable trough these conduits or should I get 1" PVC. Can I put boxes only accessible in the attic so that I can pull cables through less turns. Thanks for your time.