How to run cables in drywall?

It is unlike a masonry wall with built-in conduits, isn't?

How is it done?

Thanks in advanced.

  • 1
    What type of cables data? Power? Both?
    – Ed Beal
    Feb 27 '21 at 19:32
  • 1
    Best if done before drywall goes up. Quite messy if you want cables behind drywall after. Mention what type of cables you are using in your question, and someone here might have nice looking solution to placing them.
    – crip659
    Feb 27 '21 at 19:32
  • Power cables is my principal focus. But i have doubt in data cables too.
    – Guilherme
    Feb 27 '21 at 19:39
  • Are you talking about running cables in a frame wall that's then being drywalled over, or running cables in an already-built frame/drywall wall? Feb 27 '21 at 19:41
  • 1
    On (as per title) use raceway (one for power, one for data). In, with the drywall in place, you'll be cutting a lot of drywall and doing a lot of repairs, unless you have some very fortunate arrangements. Often easier to go up or down to above or below the wall rather than through every stud, if not wiring ahead of drywall. But if work is extensive, just pull out full-sheet sized holes and install new sheets after you are done.
    – Ecnerwal
    Feb 27 '21 at 19:44

When adding new circuits in existing drywall pros will cut a hole where the box goes.

Next use special drill bits to drill up or down depending on the direction of the wire pull, drilling up to get through any fire breaks going to the ceiling then drilling through the top plate, or to go down or through the bottom plate going to the crawl space.

The side of the hole is the size for an old work box. The special drill bits are long flexible screw end spade bits the screw tip helps pull the bit into the work. A trick to center the bit to keep it 1-1/4” away from the plate edge is using a tennis ball on the shaft. (This can be difficult on exterior walls with insulation, in some cases another hole is cut and patched usually high on the wall) to get the needed holes to snake the cable in the wall.

Several methods to run the wire in the walls include:

“fish rods” are used these are normally thin fiberglass rods that we feed up to the hole and use to pull the cable down.

A pull string is commonly used dropped through the top hole with a tubular lead weight (think fishing) I mark the string for 8’ so I know the string made it all the way down. If it hangs up pulling up and letting it drop will tunnel through fiberglass insulation. Then use a coat hanger to reach in through the hole and grab the string.

The last method is usually on interior walls or no insulation straighten the cable and stuff it in the hole and feed it down grabbing the cable from the hole with a coat hanger.

Inside the wall no staples are required when pulling nm (Romex) or flex (mc,ac or flex able conduit) in a finished wall.

These are the methods I normally use.

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