How To Install Rough Electricity in New Construction

Installing rough electricity involves running electrical wiring, installing outlet boxes, and setting up light fixtures before the walls are closed. It’s really a job for a licensed electrician. In this video and guide, This Old House electrician Scott Caron discusses the key steps for installing rough electricity in a newly framed basement room.

What is Rough Electricity?

Rough electricity installation involves running electrical wires through a building’s framing, installing electrical boxes for outlets and switches, and setting up connections for light fixtures. This work is completed while the walls are still open, allowing easy access to the framing and providing the flexibility to make adjustments as needed.

Installing rough electricity is important for several reasons:

• Safety: Proper installation ensures the electrical system meets code requirements and minimizes the risk of electrical fires or shocks.
• Functionality: A well-planned electrical layout provides convenient access to power throughout the space.
• Future-proofing: Installing adequate outlets and circuits during construction is easier and more cost-effective than adding them later.

Planning Your Electrical Layout

Carefully planning your electrical layout before beginning the installation process is beneficial. You’ll need to determine where to place outlets and light fixtures and their switches.

Determining Outlet Placement

When planning outlet placement, consider the following guidelines:

• Code requirements: The National Electrical Code (NEC) stipulates that outlets should be placed so that no point along a wall is more than 6 feet from an outlet.
• Furniture: Plan for outlets near where you expect to place furniture or electronic devices.
• Special needs: Add dedicated circuits for high-power appliances like refrigerators or air conditioners.

Planning Light Fixtures and Switches

For lighting, consider:

• The type and number of light fixtures needed for each room
• The placement of switches for easy access when entering or exiting a room
• Any special lighting needs, such as task lighting in a kitchen or workspace

Materials and Tools for Installing Rough Electricity

Before starting the installation, gather all the necessary materials and tools.

Essential Materials

• Electrical boxes for outlets and switches
• Non-metallic (NM) cable (14-gauge for most general-purpose circuits)
• Cable staples
• Wire nuts
• AFCI (Arc Fault Circuit Interrupter) breaker
• Recessed light fixture housings (if applicable)
• Switches and outlet covers
• Electrical tape

Required Tools

• Hammer
• Drill with appropriate bits
• Wire strippers
• Lineman’s pliers
• Voltage tester
• Tape measure
• Utility knife
• Level

Installing Electrical Boxes

The first step in rough electrical installation is mounting the electrical boxes for outlets and switches.

To install outlet boxes:

1. Mark the location of each outlet, typically 18 inches from the floor to the center of the box.
2. Secure the box to the stud using the built-in nails or screws.
3. Confirm that the box is flush with the face of the stud to allow for proper drywall installation later.
4. Double-check that each box is level.

For switch boxes:

1. Mark the location, usually 48 inches from the floor to the center of the box.
2. Mount the box securely to the stud–make sure it’s level and flush with the stud face.
3. Use a level to confirm the box is perfectly aligned.
4. Provide additional support if necessary to keep the box from shifting.

Running Electrical Wire

Once the boxes are in place, it’s time to run the electrical wire throughout the framing.

Begin by drilling holes in the center of each stud to run the wire through. Keep these holes aligned to make wire pulling easier and neater. Then:

1. Unroll a manageable length of wire to keep it flat and easier to work with.
2. Feed the wire through the drilled holes, leaving enough slack at each box for connections.
3. Secure the wire within 6 inches of each box using cable staples.
4. Avoid sharp turns and kinks to prevent damage to the wire.

Connecting Outlets in Series

To connect outlets in series:

1. Strip about 8 inches of sheathing off the wire at each box.
2. Feed the wire into the box, leaving enough length to make connections.
3. For boxes with multiple wires, splice the bare ground wires together using a green wire nut, leaving one wire exposed for connection to the outlet.
4. Use wire nuts to connect the black and white wires, matching colors appropriately.

Setting Up Lighting Circuits

Setting up lighting circuits involves running the wire from the switch to the light fixtures.

1. Run the wire from the nearest outlet to the switch box.
2. From the switch box, run the wire to the first light fixture location.
3. If there are multiple fixtures, connect them in series from the first fixture.
4. Leave enough slack at each fixture for future adjustments.

Then, you can connect the light fixtures. Here are the steps:

1. Strip the wires and prepare them for connection.
2. Attach the wires to the light fixtures–make sure the connections are secure.
3. Use push-in connectors if provided, as they simplify the wiring process.
4. Secure the fixtures to the ceiling, checking that they are level.

For recessed lighting:

1. Mark the locations for the light fixtures on the ceiling.
2. Install the recessed light housings according to the manufacturer’s instructions.
3. Run wire to each housing, leaving enough slack for connections.
4. Secure the housings firmly to prevent them from shifting during drywall installation.

Connecting to the Main Panel

The final step in rough electrical installation is connecting the new circuit to the main electrical panel. This step requires extra caution and likely requires a licensed electrician.

Installing the Circuit Breaker

1. Shut off the main power to the panel.
2. Install an AFCI breaker in an available slot in the panel.
3. Connect the circuit wire to the breaker according to the manufacturer’s instructions.
4. Double-check all connections for security and accuracy.

Final Steps

Once you’re done, you’re ready for the finishing touches.

1. Tape over the breaker to prevent accidental activation.
2. Re-check all connections and cable placements.
3. Test the system once power is restored to confirm everything is functioning correctly.

Safety Precautions

Working with electricity can be dangerous. Always double-check that the power is off before working on the panel, and use a voltage tester to verify that no current is flowing.

Avoid working alone; having someone nearby can provide an added safety measure. And wear protective gear, such as gloves and safety goggles, to avoid injury.

Our Conclusion

Installing rough electricity in new construction is a complex task. Following code requirements, planning carefully, and prioritizing safety can create a solid foundation for your home’s electrical system. Remember to have your work inspected by your local government before covering the walls.

Expert assistance with this project was provided by Caron Electric.