A dedicated circuit is a single breaker at your electrical panel that feeds exactly one outlet, one appliance, or one specific load — nothing else. It's not a luxury; the National Electrical Code has required dedicated circuits for major appliances for decades. When they get skipped, you get tripped breakers, damaged appliances, and (worst case) electrical fires.
What legally needs a dedicated circuit
By NEC (most editions):
- Refrigerator — dedicated 20A
- Dishwasher — dedicated 20A (often shared with disposal — see below)
- Garbage disposal — dedicated 15A/20A
- Microwave (built-in / over-the-range) — dedicated 20A
- Range / oven — dedicated 240V, 40–50A
- Cooktop (separate from oven) — dedicated 240V
- Bathroom outlets — dedicated 20A GFCI, serving only bathroom receptacles
- Kitchen small-appliance circuits — at least two dedicated 20A circuits for countertop outlets
- Laundry — dedicated 20A for the washer, dedicated 240V for an electric dryer
- HVAC / furnace / A/C condenser — dedicated
- EV charger — dedicated 240V, typically 40–60A
- Tankless water heater (electric) — dedicated 240V, often 2×40A
Why builders skip them
Running an extra home run to the panel takes time and copper. On tract construction and budget remodels, everything shared on one 15A circuit "works" — until you run the microwave, toaster, and coffee maker on the same morning.
What happens when circuits aren't dedicated
- Nuisance breaker trips every time two appliances run at once.
- Motor damage on refrigerators and disposals from voltage sag when other loads share the circuit.
- Overheated wiring in walls — the leading cause of electrical fires in remodel-era homes.
- Failed inspection if you ever sell or permit future work.
Where we always add dedicated lines
On kitchen, bathroom, ADU, and whole-home remodels, we default to:
- Dedicated circuits for fridge, dishwasher, disposal, microwave, range hood, and range/oven
- Two dedicated small-appliance circuits per NEC
- Dedicated 20A GFCI for each bathroom
- Dedicated laundry and HVAC circuits
- A dedicated 240V for an EV charger stubbed to the garage — even if you don't own an EV yet, the wire is 10% of the cost when the walls are already open
Home addition or ADU? We size the subpanel with room for future dedicated circuits so you're not repulling wire in five years.
Want us to look at your panel and existing wiring? Reach out for an honest walkthrough.
