Run NM Electrical Cable for Lighting
From Recessed Staircase Lighting · Step 3 of 8 · Video by This Old House
Showing 4:17–5:10 of the source video. Watch the full video with every moment.
What happens in this clip
After running all cables for the outlets, it's time to route wires for lighting. Plan the locations for recessed lights, typically aiming for even spacing across the ceiling. The standard height for a light switch is 48 inches from the floor to the center of the box. Run NM electrical cable from the main power source (or a designated junction box) to the light switch box, and then from the switch box up through the ceiling joists to the first light fixture. From the first light fixture, continue running cables to subsequent light fixtures, connecting them in a series or parallel configuration as per the lighting plan. Secure all ceiling cables to the joists using electrical staples at appropriate intervals, similar to the wall wiring.
Step 3 of 8: Install Wiring
Drill holes through wall studs or ceiling joists as needed to route the electrical cable. Use a fish tape or similar tool to pull the wire through. Ensure the wire is secured properly and does not come into contact with sharp edges. Leave enough slack at each fixture location for making connections. The wire type and gauge must be appropriate for the circuit's amperage and the fixture's requirements, typically 14/2 or 12/2 NM-B cable for residential lighting.
Every video in Recessed Staircase Lighting
Step 1: Plan Lighting Layout
- 0:42–1:17 Mark Recessed Step Light Locations
- 0:00–0:01 Plan and Mark Light Locations
- 0:34–0:49 Mark Light Placement
Step 2: Determine Power Source and Circuit Needs
- 5:24–5:56 Connect to Existing Power
Step 3: Install Wiring
- 4:17–5:10 Run NM Electrical Cable for Lighting (this video)
- 1:10–1:28 Install Electrical Wiring
- 16:51–21:10 Run the Wires in the Ceiling
Step 4: Cut Fixture Openings
- 1:37–2:29 Cut Opening for Light Fixture and Drill Wiring Path
- 3:50–4:15 Cut Openings for Fixture Boxes
- 4:11–5:24 Cut Drywall Openings
Step 5: Install Light Fixtures
- 2:04–3:10 Install Recessed Light Housing
- 4:46–5:24 Install LED Light Fixture
- 0:17–0:23 Install LED Lights into Ceiling
Step 6: Connect Wiring
- 3:29–4:49 Connect Electrical Wires
- 0:28–0:36 Make Wire Connections with Wire Nuts
- 2:18–2:55 Make Wire Connections
Step 7: Test the System
- 3:42–3:55 Test the Light Fixture
- 2:11–2:21 Restore Power and Test
- 2:16–2:20 Power On and Test
Step 8: Install Trim or Covers
- 2:05–2:23 Install Light Bulbs and Trim
- 0:16–0:33 Install Decorative Trim
- 3:57–4:29 Install Trim and Bulb
Questions about Recessed Staircase Lighting
What are the most critical safety precautions I need to take for this electrical project?
Always ensure the power is off at the circuit breaker before starting any electrical work. Use a voltage/circuit tester to confirm wires are dead before touching them. Familiarize yourself with local electrical codes and wear appropriate safety gear, including insulated gloves and eye protection. If you are uncertain about any step, hire a licensed electrician.
What specialized tools are absolutely essential for installing recessed staircase lighting?
Beyond basic tools, you'll need a voltage/circuit tester for safety and a good drill. A fish tape (like the Klein Tools 100 ft. Non-Conductive Fiberglass Fish Tape) is crucial for running wires through finished walls. A specialized auger bit (e.g., DIABLO 1/2 in. x 7-1/2 in. Auger Bit) is recommended for drilling through studs, and a cable stapler helps secure wiring correctly.
How important is the initial planning for light placement, and what's a common mistake to avoid?
Planning the light layout is crucial for achieving even illumination and avoiding glare, especially on stairs. A common mistake is not considering the light beam spread or stair dimensions, resulting in inadequate lighting or harsh hot spots. Use painter's tape or temporary lights to visualize the effect before cutting any holes.
The project is estimated to take '3 days'; what contributes most to that time, and can it be shortened?
The 3-day estimate accounts for careful planning, safely running new wiring, precise hole cutting, fixture installation, and potentially patching or painting. Much of the time is dedicated to ensuring electrical safety and code compliance. While careful work takes time, having all tools and materials ready can prevent delays, but rushing electrical work is never recommended.
Are there any less invasive or easier alternatives to recessed lighting for staircases?
Yes, if cutting into walls for recessed fixtures seems too daunting, consider surface-mount step lights or LED strip lighting. LED strips can be installed under stair nosings or along handrails, offering a softer, diffused light. These options generally require less structural modification but still involve proper electrical connections.
Recessed Staircase Lighting
This project involves planning the layout, safely running electrical wiring, cutting holes in the wall, installing the light fixtures, and connecting them to a power source. It's a moderately complex electrical project that requires careful attention to safety and building codes.
Read the full guide Browse all guides
Planning this project? Shop Oak Valley Designs.
Subscribe for exclusive updates
Be the first to know about promotions, new products, and sales.