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I'm trying to wire a light above a door that has a 2X6 header. The header has a gap between the 2 boards (there is no 1/2 inch plywood). Is it okay to run NM 12-2 wire through the gap in the header? Does this violate any codes?
Is there some obstacle that prevents you going through the top plate and over the header? Where are you going to mount the light fixture, on the other side of the door opening? Are you drilling through the king studs to fish the wire through the 1/2 inch gap between the header 2 X 6's? Are there cripples between the top of the header and the bottom of the top plate you could drill through? You have some leeway if this is existing construction, but the inspector wouldn't like to see it done this way if on new construction.
It is old construction. The switch to the light is mounted inside the jack and king studs (the header is much wider than the actual door because a sliding glass door used to be there) The fixture is mounted above the door on the other side.
There is absolutely no reason whatsoever why you couldn't do that. It violates no codes and is perfectly safe in all regards. The only thing the code says is you have to be 1 1/4 in from the outside edge of a framing member, which you would be 1 1/2 inches, so it is perfectly fine.