ECN Forum Forums General Topics of the Trade Voice - Data - Video Discussion Separation between HDMI and 110 VAC lines

I have a customer who purchased an LCD tv and wants to mount it over his fireplace mantle. He'll keep his existing cable box and DVD player in the original location. I need to run power and an HDMI line to the new location. What kind of separation do I nedd between the two so I don't have an interference issue?