What You Need to Know Before You Start
Wiring a range hood means running electrical cable from your home's circuit breaker to the hood itself, then connecting the wires inside the hood to its motor and controls. The job requires you to turn off power at the breaker, run cable through walls or above cabinets, and make wire connections inside a junction box. Most range hoods use either 120-volt or 240-volt power depending on the model — check your hood's manual to know which one you have.
This is not a task for someone without electrical experience. If you are not comfortable working inside your breaker panel or running cable through walls, hire a licensed electrician. A mistake here can cause a fire or electrocution. The cost of an electrician is far lower than the cost of a house fire.
Before you begin, confirm that your home's electrical system has a spare breaker slot and enough amperage to support the hood. A 120-volt hood typically needs a 20-amp breaker; a 240-volt hood needs a 40-amp or 50-amp breaker depending on the model. Your electrician or the hood's manual will tell you which one.
Key Takeaways
- Turn off power at the breaker before touching any wires, and use a voltage tester to confirm the power is actually off.
- Run the correct gauge cable from the breaker to the hood location — 12-gauge for 20-amp circuits and 8-gauge for 40-amp or 50-amp circuits.
- Cable must run through walls inside conduit or be stapled to the underside of cabinets every 4.5 inches, and cannot be left exposed in living spaces.
- Connect the wires inside the hood's junction box by twisting copper to copper and neutral to neutral, then find each connection with a wire nut.
- Have a licensed electrician inspect the work before you turn the power back on, especially if you are not experienced with electrical work.
Choosing the Right Cable and Breaker
The cable gauge and breaker size depend on the voltage and amperage your hood requires. A 120-volt hood drawing up to 20 amps needs 12-gauge cable and a 20-amp breaker. A 240-volt hood drawing 40 to 50 amps needs 8-gauge cable and a 40-amp or 50-amp breaker. Using the wrong gauge cable is dangerous — undersized cable overheats and can start a fire.
Check the hood's nameplate or manual for the exact amperage and voltage. If the manual is missing, look for a label on the back or inside the hood itself. Write down the voltage and amperage before you go to the electrical supply store. The store staff can confirm the cable gauge you need once you tell them the breaker size.
You will also need a new breaker that matches your panel type — some panels use different breaker styles, and a breaker that does not fit your panel will not work. Bring a photo of your breaker panel to the store, or ask an electrician which breaker type you need.
Running Cable from the Breaker to the Hood
Cable must be protected from damage and cannot run through living spaces exposed. If the hood is directly above the stove and your breaker panel is in the basement or garage, you have two main routes: run cable up through the wall cavity inside conduit, or run it along the underside of cabinets and up the back of the hood cabinet.
For cable inside walls, drill a hole through the top plate of the wall where the hood will be, then feed the cable down through the wall cavity to the breaker panel location. Use electrical conduit to protect the cable where it is exposed — for example, in the basement or garage. Conduit is a metal or plastic tube that surrounds the cable and keeps it from being pinched or cut.
For cable run along the underside of cabinets, staple it every 4.5 inches using staples designed for electrical cable — regular staples will crush the cable. The cable must be secured before you connect it to the hood. Do not leave cable hanging loose or coiled; it must be supported along its entire length.
Turning Off Power and Preparing the Breaker Panel
Turn off the main breaker first, then use a voltage tester on the breaker panel to confirm that power is off. A voltage tester is a handheld tool that lights up or beeps when it detects live electricity. Test it on a known live outlet before you use it on the panel, so you know it is working.
Once you have confirmed the power is off, locate an empty breaker slot in your panel. If there is no empty slot, you may need to upgrade your panel — this is a job for a licensed electrician. Do not try to add a breaker where one does not fit.
Install the new breaker by sliding it into the empty slot until it clicks into place. The breaker should fit snugly and sit flush with the other breakers. If it does not slide in easily, stop and check that you have the correct breaker type for your panel.
Connecting Wires Inside the Hood's Junction Box
The hood has a junction box — a metal or plastic box on the back or inside the hood where the incoming cable connects to the hood's wires. Open this box and you will see the hood's internal wires: usually a black wire (hot), a white wire (neutral), and a bare copper wire (ground).
Strip about half an inch of insulation from the end of each wire in the incoming cable. Twist the black wire from the cable to the black wire from the hood, then find the connection with a wire nut by twisting it clockwise until it is tight. Do the same for the white wires and the copper ground wires. Each connection should be tight enough that you cannot pull the wires apart by hand.
After all three connections are made, tuck the wires neatly into the junction box and close the cover. The wires should not be pinched or bent sharply — they need room to breathe. If the wires are too long, coil the excess loosely inside the box, but do not stuff them in so tightly that the cover does not close properly.
Testing and Turning Power Back On
Before you turn the power back on, have a licensed electrician inspect the work. They will check that the cable is the correct gauge, that all connections are tight, that the breaker is the correct size, and that the hood is grounded properly. This inspection usually costs between $100 and $200 and is money well spent.
Once the electrician has approved the work, turn the main breaker back on, then flip the new breaker to the on position. The hood should have power. Test it by turning on the fan and the light. If either does not work, turn the breaker off when ready and check all the wire connections inside the junction box.
If the breaker trips when ready when you turn it on, there is a short circuit somewhere in the wiring. Turn the breaker off and do not try to use the hood until you have found and fixed the problem. A tripped breaker is a sign that something is wrong, and using the hood anyway is dangerous.
Common Mistakes to Avoid
The most common mistake is using the wrong cable gauge. A 20-amp circuit needs 12-gauge cable; a 40-amp or 50-amp circuit needs 8-gauge. Using 14-gauge cable on a 20-amp circuit will overheat and can cause a fire. Check the breaker size and the cable gauge before you buy materials.
Another common mistake is leaving cable exposed in living spaces. Cable must be inside conduit or stapled to the underside of cabinets. Exposed cable in a kitchen or dining room is a code violation and a safety hazard — someone could trip on it or damage it accidentally.
A third mistake is making loose wire connections inside the junction box. Each wire nut should be tight enough that you cannot pull the wires apart. A loose connection creates heat, which can melt the insulation and start a fire. If you are not confident in your ability to make tight connections, have an electrician do this part.
Frequently Asked Questions
Can I use an existing outlet to plug in the range hood instead of hardwiring it?
Some range hoods can be plugged in, but most built-in models are hardwired because they draw too much power for a standard outlet. Check your hood's manual to see whether it is designed to be plugged in or hardwired. If it is hardwired, you cannot safely use an outlet instead.
What if my breaker panel is on the opposite side of the house from the range hood?
Long cable runs are possible but require more conduit and more work. The cable must still be protected and supported along its entire length. If the run is very long — more than 50 feet — you may need a larger gauge cable to avoid voltage drop. An electrician can calculate the correct gauge for your situation.
Do I need a permit to wire a range hood?
Most jurisdictions require a permit for any work that involves the breaker panel or running new circuits. Check with your local building department before you start. A permit usually costs $50 to $150 and requires an inspection when the work is done. Skipping the permit can cause problems when you sell your home.
What is the difference between 120-volt and 240-volt range hoods?
A 240-volt hood draws more power and is typically used for high-performance models or commercial-style hoods. A 120-volt hood is more common in residential kitchens. The voltage is printed on the hood's nameplate. Do not assume — check the manual or the label on the hood itself.
Can I wire the range hood myself if I have some electrical experience?
Electrical work is regulated by code for safety reasons. Even experienced homeowners can make mistakes that create fire or shock hazards. If you are not a licensed electrician, have one inspect your work before you turn the power on. The cost of an inspection is far lower than the cost of a fire or injury.