I let this lay here for a couple of days because I know I will be flamed but I don't think you will ever see any interference between 60hz power and a shielded HDMI cable, even if you tywrapped them together. If you are really worried a few inches of separation will be plenty. Bear in mind a "twisted pair" for 60hz would only need a couple twists a mile to be overkill. The wavelength is over 3000 miles long. (look at a power line) The normal twist in romex as it comes out of the box is way more than enough. Just don't be a neat freak and untwist it when you staple it.
OK fire when ready
