adding a room, nearly finished w/ the wiring, planning to run wiring for the speakers, satellite and phone in close proximity to the electric lines, several places in the same conduit. anybody see any problems with doing that?
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Yes. Low voltage stuff of any kind in the same boxes and/or conduit with power is strictly forbidden by code. Let the wrong things accidentally touch and you have 120 VAC where people reasonably expect to find only low voltage. This really happens. A friend of mine got bit by 120 VAC on his supposedly professionally installed satellite coax. (That was an old house, K&T in the attic.)
Close proximity between power in Romex or plastic conduit and signal level stuff won't kill you, but it will give you AC hum. You might get hum on your phone line, and hum bars on your satellite TV picture, but not likely at speaker level. Speaker runs, though, can be a source of noise into lower level lines.
-- J.S.
Yup. Besides the fact power circuits can cause noise on your other circuits, it's a Code violation (Article 800 of the NEC.)
Power circuits have to be kept in separate conduits, and in general should be kept as far from telephone/speaker/satellite circuits as you can make them.
There are boxes designed to hold line voltage and low voltage in one box---there is a wall that seperates the two--not sure about all the building codes, but I think they are UL listed.