When wiring a new kitchen, upgrading a laundry room, or installing a Level 2 EV charger, guessing wire and breaker sizes is a fast track to melted terminals and tripped panels. The direct answer for most standard 120V household appliances is that they draw between 5A and 15A, requiring 14 AWG copper wire and a 15-amp breaker. However, large 240V appliances like electric ranges, dryers, and EV chargers draw 20A to 50A, demanding 10 AWG to 6 AWG wire and 30-amp to 50-amp breakers.
This guide provides a comprehensive amp chart for appliances based on standard residential loads, followed by the critical National Electrical Code (NEC) derating math that dictates whether your installation will actually pass inspection.
How to Read This Appliance Ampacity Chart
Before pulling wire, you need to understand how to read the data below. This table maps common household appliances to their nominal voltage, typical maximum amp draw, and the NEC-mandated minimum copper wire size and maximum breaker size. The wire sizes listed assume standard copper conductors (like THHN or NM-B) and are based on the NFPA National Electrical Code (NEC) Article 310.16 ampacity tables.
Crucial Column Context: The wire sizes below are based on the 60°C column for 14, 12, and 10 AWG (per NEC 240.4(D)), and the 75°C column for 8 AWG and larger, which aligns with the termination temperature ratings of standard residential breakers and receptacles. Always check the specific nameplate on your appliance; if the manufacturer specifies a higher Minimum Circuit Ampacity (MCA), the nameplate overrides this general chart.
| Appliance (Quick-Jump) | Nominal Voltage | Typical Amp Draw | Min. Copper Wire (AWG) | Max Breaker Size |
|---|---|---|---|---|
| Refrigerator | 120V | 3A - 6A | 14 AWG | 15A |
| Garbage Disposal | 120V | 7A - 10A | 14 AWG | 15A |
| Dishwasher | 120V | 10A - 14A | 14 AWG | 15A or 20A |
| Countertop Microwave | 120V | 10A - 15A | 12 AWG (Dedicated) | 20A |
| Electric Water Heater | 240V | 18A - 25A | 10 AWG | 30A |
| Electric Dryer | 240V | 25A - 30A | 10 AWG | 30A |
| Electric Oven/Range | 240V | 30A - 50A | 6 AWG (or 4 AWG) | 40A or 50A |
| Central AC Condenser | 240V | 15A - 40A | Varies by MCA | Varies by MOCP |
| EV Charger (Level 2) | 240V | 16A - 48A | 6 AWG to 2 AWG | 20A to 60A |
Derating, Temperature Columns, and What This Chart Cannot Tell You
A reference chart gives you the baseline, but real-world jobsite conditions change the math. Here is how to apply NEC rules when your installation deviates from the ideal.
Which Temperature Column Applies to Your Installation?
Wire insulation like THHN is rated for 90°C, but you rarely get to use the 90°C ampacity column. NEC 110.14(C) dictates that your termination points (the breaker lugs and the receptacle screws) dictate the temperature column. Most modern residential breakers and receptacles are rated for 75°C. Therefore, you must use the 75°C column to determine your final ampacity. Furthermore, NEC 240.4(D) strictly caps small conductors: 14 AWG is capped at 15A, 12 AWG at 20A, and 10 AWG at 30A, even if the 75°C or 90°C columns show higher numbers.
How Derating Modifies the Base Value
If you run multiple circuits in a single conduit, or if your attic exceeds 86°F (30°C), you must derate the wire's ampacity per NEC Article 315.15.
Worked Example: You are running a 40A continuous Level 2 EV charger. Code requires the circuit to be sized at 125% of the continuous load (40A × 1.25 = 50A circuit). You plan to pull four current-carrying conductors (two hots, one neutral, one ground doesn't count) through a PVC conduit in a 90°F garage.
- Base Wire: 6 AWG THHN. The 90°C column allows 75A.
- Conduit Fill Derating: 4 current-carrying conductors requires an 80% derating multiplier. (75A × 0.80 = 60A).
- Ambient Temperature Derating: 90°F ambient requires a 0.96 multiplier. (60A × 0.96 = 57.6A).
- Termination Limit: The 75°C column for 6 AWG is 65A.
You compare the derated 90°C value (57.6A) to the 75°C termination limit (65A) and take the lower number: 57.6A. Since 57.6A is greater than your 50A circuit requirement, 6 AWG THHN is perfectly legal. If you had added a fifth circuit to that same conduit, the derating would drop to 70%, forcing you to upsize to 4 AWG.
What This Table Cannot Tell You
This amp chart for appliances assumes short, standard wire runs. It cannot account for:
- Voltage Drop: If your detached garage EV charger is 150 feet from the panel, 6 AWG wire will suffer excessive voltage drop. You must upsize to 4 AWG or 3 AWG to keep the drop under the NEC-recommended 3% for branch circuits.
- HVAC Nameplate Data: Never use generic charts for central air conditioners or heat pumps. You must read the manufacturer's nameplate for MCA (Minimum Circuit Ampacity) to size the wire, and MOCP (Maximum Overcurrent Protection) to size the breaker. The MOCP is often significantly higher than the MCA to allow for compressor inrush current without nuisance tripping.
- Motor Starting Currents: Appliances with large induction motors (like well pumps or older table saws) draw Locked Rotor Amps (LRA) that can be 5 to 7 times higher than their running amps for a few milliseconds. Breakers handle this via magnetic trip curves, but undersized wire will still overheat if the motor struggles to start.
Appliance Amp Draw FAQ: Real-World Sizing Questions
Can I use 12 AWG wire on a 15-amp breaker for my refrigerator?
Yes, it is entirely legal to use a larger wire (12 AWG) on a smaller breaker (15A), provided the wire physically fits under the breaker's terminal lug. While 14 AWG is the standard minimum for a 15A fridge circuit, pulling 12 AWG gives you superior voltage drop headroom and future-proofs the circuit if you ever upgrade the breaker to 20A for a heavy-duty garage freezer. Just ensure you use a 15A receptacle, or a 20A receptacle if you upgrade the breaker.
Why does my microwave trip a 15-amp breaker when the fridge compressor kicks on?
This is a classic shared-circuit overload. A modern microwave can draw 14A to 15A while cooking. When the refrigerator compressor starts, it pulls a brief inrush current (LRA) that can spike the shared circuit well past the 15A thermal limit of the breaker. Furthermore, NEC 210.23 requires that cord-and-plug connected appliances on a shared circuit not exceed 80% of the branch circuit rating if they are considered continuous loads. The fix is simple: run a dedicated 20A circuit with 12 AWG wire exclusively for the microwave.
How do I size the breaker for a hardwired dishwasher and garbage disposal on the same circuit?
Under NEC 210.23(A)(2), the combined rating of hardwired appliances on a single branch circuit cannot exceed the circuit's rating. If your garbage disposal draws 8A and your dishwasher draws 12A, your total continuous load is 20A. You cannot put this on a standard 15A or even a 20A circuit without risking a trip, because the dishwasher's heating element acts as a continuous load (running for 3 hours or more during dry cycles). You must calculate 125% of the continuous load (12A × 1.25 = 15A) plus the non-continuous load (8A), totaling 23A. This requires a dedicated 25A or 30A circuit with 10 AWG wire, or you must split them onto two separate 15A/120V circuits.
Does this amp chart for appliances apply to the DC side of my off-grid solar inverter?
Absolutely not. The DC side of a solar or battery inverter operates at low voltages (12V, 24V, or 48V) and extremely high currents. For example, a 3,000W inverter on a 12V battery bank will pull over 250A of continuous DC current. This requires NEC Article 690 compliance, massive 2/0 AWG or 4/0 AWG welding cable, and Class T fuses. Never use standard 120V/240V AC appliance ampacity charts for DC battery wiring.
