How to Run Wires Through Walls

The next task is to locate the studs behind the wall in the desired installation area for hiding wires in a wall. The wires and cords will run through the mostly hollow space between the studs. 

The stud finder you’ll use for this task should detect not only the wood studs but also the existence of pipes and wires behind the wall. 

• Use painters tape and a writing instrument to mark the stud locations.
• Mark the top installation location at a point on the wall where it will be concealed by the TV. Mark the bottom exit hole at a point on the wall closest to a power outlet. Make sure to note where the electrical wiring is using the stud finder.
• Run the stud finder down the wall between the marked installation and exit points. Look for blocks, the wooden spacers between the wall studs that may be present in load-bearing walls. If blocking is detected, you may have to cut through it to run the lines down behind the walls.
• Make careful measurements when marking the locations. A 2 1/2-inch minimum clearance from any stud is needed to run the wires through smoothly.

Drilling the holes for the wires requires a hole saw specifically designed for this task of how to run wires through walls. The saw will cut through drywall and create airborne dust and debris that can be harmful if inhaled.

• Before drilling the holes, attach a trash bag with painters’ tape to the bottom of the wall to catch drywall dust. Wear a face mask or respirator mask to avoid inhaling the dust.
• Attach the hole saw to a power drill. Align the guide bit of the hole saw to the center mark of the installation location on the wall and create the hole.
• Remove the drywall plug from the saw and cut out the second hole at the exit point.
• Even if the stud finder detects no wires or pipes, be careful to cut just through the wallboard and stop. Don’t push so hard that the saw blade punches all the way into the wall when it breaks through.
• Carefully fold and remove the trash bag from the work area.

Install the low-voltage boxes before running the wires through the entrance and exit holes. Low-voltage brackets and receptacle boxes also work for hiding wires in a wall. 

• Place one of the low-voltage boxes or brackets on the entrance hole. Use a writing instrument to mark the corners of the box on the drywall. Use a level to draw a line connecting the corners.
• Using a utility knife, score along the tracing line to make it easier to cut through the drywall.
• Cut along the tracing line with a drywall saw. The saw should go no more than a half inch into the wall. Remove the cut drywall from the opening.
• Push the low-voltage box or bracket into the opening. Use a screwdriver to turn the box tabs behind the wall and secure the box into place.
• Align the other box or bracket over the exit hole. It should be adjacent to or above the power outlet.
• Mark the corners of the second box on the drywall and draw a line connecting the corners. Score along the tracing line with a utility knife. Cut along the tracing line with a drywall saw.
• Push the low-voltage box or bracket into the exit hole cavity. Use a screwdriver to turn the box tabs behind the wall and secure the box into place.

The fish stick (also called a fish tape or glow rod) is a flexible rod with a small hook attached to the end. Use the fish stick to catch and pull the wires through the space behind the walls. The fish stick helps run the cords and wires through if there’s insulation in the wall.

• Push the fish stick up through the bottom exit low voltage box and out through the top low voltage box. The fish stick should be protruding from both the top and bottom holes.
• Tape the fish stick to the wall temporarily.

This step details how to run the wires through walls after the voltage boxes have been installed. 

• Hook the fish stick around the cord and wires at the top.
• Pull the wiring down towards the exit hole, removing the fish stick once the cord and wires are through.

Once all the cables are through, attach the top and bottom face plates. 

The choice of face plate will accommodate the electrical cord and, if necessary, the coaxial cable. Choose a wall plate with a flexible opening to run the wires and cables through as an option to a plate with a coaxial cable jack. 

These steps complete the task of hiding wires in a wall. 

• Replace the TV onto the wall brackets. The TV should completely cover the entrance hole.
• Slightly insert the wires at the lower exit hole to conceal them.
• Plug the TV cord at the lower exit hole into the power supply.
• Connect other cables as needed.