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I am getting ready to replace some outlets in my pole barn, the original circuits were run in Romex and I am planing on using MC Cable to replace them (the field mice chewed the original ... I know thats a whole different forum for that problem but its the way I bought the place and already got a cat :) So my main concern is the routing of the wiring I am bring in a new 200 amp service and meter with proper grounding, if the metal casing (using Aluminum clad) of the wiring touches the building is it considered a double ground and a safety concern? The original Romex was looped over the outside of 4x6 posts 9 feet height on the original pull if I route the new wiring the same way it will contact the building, should I drill the 4x6 posts and run the MC thur each one I was concerned about weaking the structure as well. I appreciate the input :)
 

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.....there is absolutely no reason why MC cable jacket can't come in contact with building steel.

In fact it's intentionally done at least once.
 

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