How to Mount a TV on the Wall Safely (Phoenix Homeowner Guide)

Step-by-step guide to mounting a TV on a wall in a Phoenix home: mount rating (UL 2442), finding studs, checking for hidden wires, hiding cables the legal way (NEC 400.12, 722.135) and when to call a licensed pro.

By Gabriel · Licensed Phoenix, Arizona General Contractor ROC 367058 (R-62) · 2026-11-14

A TV on the wall looks better and frees up space, but a 50 to 80 inch TV is heavy and expensive, and the wall behind it holds more than studs and drywall: wires, pipes and sometimes a fire-resistance requirement. Most TV mounting problems I see in Phoenix homes come from anchoring only into drywall, drilling into a hidden wire, or hiding a power cord inside the wall.

Below is the order I follow on a standard wood-stud and drywall wall. Each step says why it matters and which code, standard or section it comes from. The mount itself is a product-safety question (UL 2442), and the wiring and wall rules come from the 2023 NEC and the 2024 IRC. If your wall is brick, block, stone or tile, or the TV goes over a fireplace, read the 'call a pro' section first.

Tools and parts

• Stud finder (with live-wire detection if possible)
• 2 ft or longer level and a pencil
• Drill and drill bits for pilot holes (size from the mount instructions)
• Socket wrench or ratchet for lag screws (no impact driver)
• Screwdriver set
• Painter's tape
• TV wall mount with the TV's VESA pattern and weight rating, ideally tested to UL 2442
• In-wall rated (CL2/CL3) cable if you need to hide low-voltage cables, plus a low-voltage wall plate
• A helper to lift the TV
• Soft blanket for laying the TV face-down

Step-by-step

1. Check the TV weight and the mount rating before you buy or hang anything

   Find the weight of your TV (without the stand) and its VESA hole pattern, the square or rectangle of four threaded holes on the back, in the manual or on the label. Pick a mount whose weight rating is clearly above the TV weight and whose pattern range covers your TV's holes, and look for a mount marked as tested to UL 2442.

   Why: UL 2442, the safety standard for wall and ceiling brackets, tests a mount at four times its rated load when the rating is 100 lb or less, and at twice the rating plus 200 lb above 100 lb. A mount that is only 'close enough' on weight leaves you with none of that margin. The VESA flat display mounting interface (FDMI) standard defines the hole patterns so the TV and bracket line up.

   Code: UL 2442 (wall and ceiling mounts: load test of 4x rated load up to 100 lb; 2x + 200 lb above 100 lb) · VESA FDMI (MIS-D, MIS-E, MIS-F hole patterns)

2. Pick the wall and the height, then find the studs

   Sit where you will usually watch and mark the height so the middle of the screen is about eye level. Avoid walls with heat or glare problems, such as above a working fireplace or in direct afternoon sun. Use a stud finder, confirm with a small finish nail in the spot the bracket will cover, and mark the center of two studs with painter's tape.

   Why: In a typical house the studs are what carry the load; drywall alone does not hold a TV. The IRC allows interior nonbearing walls to be framed with studs 16 or 24 inches on center depending on the stud size, and bearing walls follow the stud table, so the spacing varies and you must locate each stud instead of guessing.

   Code: 2024 IRC R602.5 (interior nonbearing wall framing and stud spacing) · 2024 IRC R602.3.1 and Table R602.3(5) (stud size, height and spacing)

3. Check what is hidden in the wall before you drill

   Look for outlets, switches and light fixtures on the wall and on the other side of it, because wires usually run straight up and down from them. Use a stud finder with a live wire detection mode and keep your lag screws in the center of the stud. Drill pilot holes only as deep as the lag screw length in the instructions, and stop if the bit suddenly goes in with no resistance.

   Why: Cables in wood studs are only required to stay 1 1/4 inch from the face of the stud or be covered by a steel nail plate, which is not enough room to be careless with a long screw or drill bit. Cables running parallel to a stud have the same 1 1/4 inch rule. If a screw or bit hits a cable, the wire can be nicked and cause a fire or shock later, with nothing visible.

   Code: 2023 NEC 300.4(A)(1) (bored holes in wood: 1 1/4 in. from edge or 1/16 in. steel plate) · 2023 NEC 300.4(D) (cables parallel to framing members)

4. Plan the power: never run an extension cord inside the wall

   Plan where the TV's power cord will plug in. If there is no outlet close to the TV, a licensed electrician can install a new outlet behind or just below it. Do not run the TV's power cord or an extension cord through a hole in the wall to an outlet in another spot, and do not plug the TV into a power strip that is hidden inside the wall.

   Why: The NEC does not allow flexible cords, extension cords or power supply cords to be used as a substitute for fixed wiring, to be run through holes in walls, or to be concealed inside walls, because they are not designed to be buried where heat, nails or screws can damage them and nobody can see the damage. In-wall power wires have to be a permanent wiring method installed to code.

   Code: 2023 NEC 400.12(1) (no substitute for fixed wiring) · 2023 NEC 400.12(2) (not through holes in walls) · 2023 NEC 400.12(5) (not concealed in walls, floors or ceilings)

5. Use the right cable for the in-wall low-voltage run

   For HDMI, Ethernet or speaker wires that go inside the wall, buy cable that is printed with an in-wall rating such as CL2 or CL3 on the jacket (HDMI and Ethernet cables also come with CM/CMR markings). Use a low-voltage wall plate or a brush-plate with a mounting bracket made for low-voltage cables, not a standard power box. Keep the low-voltage cable away from 120 volt wires, and do not share one box with power wiring unless it has a listed divider.

   Why: Under the 2023 NEC, cables installed in buildings for Class 2 and Class 3 power-limited circuits must be listed and marked for the type of space, and the listing marking is how you and an inspector know it is in-wall rated. Class 2 and Class 3 conductors are also generally kept out of the same enclosure, raceway or cable as light and power conductors unless a barrier or one of the listed exceptions applies, so a power-limited cable does not pick up line voltage.

   Code: 2023 NEC 722.135(B) (cable types and where they may be used) · 2023 NEC 722.179 (listing and marking of cables) · 2023 NEC 725.136(A) (separation from electric light and power conductors)

6. Do not cut through the top or bottom of the wall without firestopping

   Keep cable pass-throughs inside the same wall cavity between the TV and a low-voltage box lower on the same wall when you can. If a cable has to pass through the top plate or sole plate, into an attic or crawl space, ask a pro, and seal around the cable with an approved fire-resistant material.

   Why: In wood-frame houses, the IRC requires fireblocking at ceiling and floor levels, and openings around cables and wires at those levels must be filled with an approved material that resists the free passage of flame and products of combustion. An open hole through a plate lets fire and hot gas travel up the wall cavity. Interior nonbearing walls have to be fireblocked as well.

   Code: 2024 IRC R302.11 item 4 (fireblocking around cables and wires at ceiling and floor level) · 2024 IRC R602.8 (fireblocking required in stud walls)

7. 

8. Mark, level and fasten the wall plate into the studs

   Hold the wall plate against the wall at your marked height, set a 2 ft or longer level on it, and mark the holes that fall on the center of a stud. Drill the pilot holes to the size in the instructions, then drive the supplied lag screws in with a socket wrench (not an impact driver) until they are snug and the plate does not move. Do not over-tighten, because that can strip the wood.

   Why: The 4x test rating in UL 2442 applies to a mount installed the way the manufacturer says, with the hardware that came with it, into solid framing. Skipping a stud, using drywall anchors or using shorter screws removes that safety margin. Level now, because a crooked plate is hard to fix once the TV is hanging.

   Code: UL 2442 (installation instructions and supplied hardware) · 2024 IRC R602.3.1 (studs carry the load)

9. Attach the brackets to the TV

   Lay the TV face-down on a blanket on a table or bed. Find the screw size in the TV or mount instructions, thread each screw in by hand first, then tighten the brackets onto the VESA holes so they are snug and level. Use the spacers that come with the mount if the back of the TV is curved or recessed. Do not use a screw that is longer than the instructions say.

   Why: VESA hole patterns and screw thread (such as M6 or M8) are standardized, but the depth of the hole is not, and a screw that is too long can bottom out and damage the circuit boards, while one that is too short can pull out of the TV. The mount is only tested with its own parts and the right fasteners.

   Code: VESA FDMI (MIS-D, MIS-E, MIS-F hole patterns) · UL 2442 (mount tested with its supplied hardware)

10. Plug in and connect the cables before you hang the TV

    Connect the HDMI, power and any other cables to the TV while it is still easy to reach the ports, route them through the opening in the wall or along the mount, and label each cable end. Use a listed power cord straight into the nearby outlet, and leave a little slack so the plug is not pulled sideways.

    Why: A TV on the wall is hard to reach, so it is far easier to make and test the connections first. Running the power cord along the wall to a visible outlet is fine, but concealing a cord inside the wall is not allowed, which is why the plan in the earlier steps matters.

    Code: 2023 NEC 400.12(5) (cords not concealed in walls) · 2023 NEC 722.135(B) (listed in-wall cable for low-voltage runs)

11. Hang the TV with a helper and lock it

    Ask someone to help you; most TVs over 40 inches are awkward to lift alone. Lift the TV by its frame, hook the brackets onto the wall plate, and let it settle. Tighten the safety screws or locking pins on the mount as shown in the instructions. Give the bottom a gentle tug to confirm the TV is locked on, then check that it is level and adjust it if the mount has fine-leveling.

    Why: The load rating of the mount, the studs and the locking hardware all work together, and the lock keeps the TV from lifting off the plate if it is bumped. A two-person lift protects the TV screen, your back and the wall.

    Code: UL 2442 (mounts rated and tested for the stated weight; use the lock)

12. Test the picture, tidy the cables and do a final safety check

    Turn the TV on and make sure every input works. Use a cord cover or paintable raceway for any visible power or HDMI cable, never a staple or nail through the cord. Gently push the TV around to check it is solid, and re-check the mount screws after a week. For tilt or full-motion mounts, keep cables loose enough to move with the TV.

    Why: Staples and nails through a cord damage the insulation and can cause a short or fire. The NEC requires equipment cords not to be attached to building surfaces or run through the wall, and cords that are pinched or stretched fail early.

    Code: 2023 NEC 400.12(4) (cords not attached to building surfaces; exception for temporary wiring) · 2023 NEC 400.12(7) (cords not where subject to physical damage)

When to stop and call a licensed pro

• The wall is brick, block, stone, concrete or tile, or the studs are metal; these need masonry or toggle anchors, special bits and sometimes sealing.
• The TV is over about 75 lb, will go over a fireplace, or on a full-motion arm that sticks out a long way.
• You want power or a low-voltage outlet behind the TV; a licensed electrician must install permanent wiring, and the work may need a permit.
• You find a wire, pipe, aluminum wiring, a warm outlet, or anything in the wall you do not understand.
• You need cables to pass through the top plate or sole plate of the wall, or you cannot tell if the wall is fire-rated.
• The TV will go outside on a patio, where weather, sun and electrical rules are different.

Common questions