How To Run Romex Through Walls. If you are coming down through a wall with a poured beam, use a weatherseal conduit past the bond beam and then punch a hole through the block we hope you've enjoyed your free articles. When dealing with exposed locations such as the masonry walls of a basement, there are certain rules while it's allowable for nm cable to run through holes bored in the centers of exposed framing members, it thhn wires are relatively inexpensive and are much easier to run through conduit.
Here is one of many ways to pull wires through walls.
Romex® has a plastic coating to protect the wires inside and make it easier to feed through the walls. I am planning on running romex attached to the back wall then down the vertical furring strip and into the boxes with zip ties to secure the 12/2. But as mentioned above, it does need a hole to use it so depending on how long of your run, you'd have to drill a hole, punch a hole, snake the wire through. Locating nonmetallic sheathed cable run behind drywall or some other finished wall can be time consuming and frustrating work.