http://www.stampcollectioninfo.com/top-plate/
I need to run PVC conduit from the attic to the basement (wiring). Is it OK to drill a 3" hole in a top plate?
I need to run low voltage wire in my house and I need to place 3" PVC conduit from attic to basement (9 ft). I want to be sure that I don't damage the integrity of the top plate by drilling a hole too large in the top plate (a 2 X 4 is 3.5" inches wide, leaving 1/2 inch on either side of the hole for integrity). I can go with 2" if needed. Does anyone know if this is covered in NEC (electrical code)?
Top plate of a wall is what ties the studs of a wall together. In general drilling throungh beams etc if you take out more than 1/3 of the thickness then you are compromising the beams ability to bear a load...just a rough rule of thumb. I definitely would not drill a 3 inch hole through 2x4. Recall that OD of 3 inch pipe is 3.5 inches so infact you will be cutting the top plate completely to get a nominal 3 inch conduit through! Use multiple 1 or even 3/4 inch conduits or find an outside route around the wall to the sub floor.
Good luck
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