I know that most typical wires cannot be run in walls or through floors. Remember to make sure that the wires you end up using are to the building code. I found out from a friend who is an inspector that even speaker and/or signal wires technically should not be wired through walls or even slipped under baseboards without using an approved type of cable. ie home theatre use. Your MH cables will be passing a couple of amps each, atleast.
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George
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