Breaker Size Answers
Appliance and wire-size pages that explain what decides a breaker answer. Motor, HVAC and nameplate-governed equipment are routed to the correct boundary instead of returning a generic verdict.
Common Questions
26 curated breaker-size pages.
- What Size Breaker for a Dryer?Electric dryer breakers follow the nameplate current and the conductor that can carry it — not a universal 30 A rule of thumb.appliance
- What Size Breaker for a Water Heater?Fixed electric water heaters are commonly treated as continuous loads, so the breaker and conductor are sized above the nameplate current.appliance
- What Size Breaker for a Electric Stove?Range and cooktop breakers start from the nameplate or the dwelling demand method — a single plug-in amp number is often the wrong path.appliance
- What Size Breaker for a Mini Split?Mini-split breakers are set by the outdoor-unit MCA and MOCP nameplate — generic amp-from-tonnage charts are the wrong tool.appliance
- What Size Breaker for a Refrigerator?Refrigerator breakers are usually a dedicated 15 A or 20 A kitchen circuit issue — not a motor-FLA guessing game from the door sticker.appliance
- What Size Breaker for a AC Unit?Central AC and heat-pump breakers are capped by the outdoor nameplate MOCP and fed by conductors that meet MCA — never by square footage alone.appliance
- What Size Breaker for a Dishwasher?Dishwasher breakers are usually 15 A or 20 A, but hardwired units, boost heaters and shared garbage-disposal circuits change the answer.appliance
- What Size Breaker for a Hot Tub?Hot-tub breakers follow the spa pack nameplate, GFCI protection requirements and often a 50 A or 60 A dedicated feed — not a generic 40 A guess.appliance
- What Size Breaker for a Tesla / EV Charger?EV charger breakers are continuous-load circuits: size to 125 percent of charging current, then confirm the panel can absorb the load.appliance
- What Size Breaker for a Well Pump?Well-pump breakers follow motor nameplate and Article 430 rules — horsepower charts without the motor FLA and protection type are incomplete.appliance
- What Size Breaker for a Garbage Disposal?Garbage disposal breakers are typically 15 A or 20 A motor loads — shared dishwasher circuits and HP stickers create most of the confusion.appliance
- What Size Breaker for a Microwave?Microwave breakers depend on input watts on the nameplate — countertop units on kitchen small-appliance circuits differ from over-the-range hardwired installs.appliance
- What Size Breaker for 14 AWG Wire?For 14 AWG wire under the displayed defaults, the largest common breaker is 15 A for copper. The calculator has no common standard breaker result for 14 AWG aluminum because aluminum is not tabulated at this small size.wire
- What Size Breaker for 12 AWG Wire?For 12 AWG wire under the displayed defaults, the largest common breaker is 20 A for copper and 15 A for aluminum. This is the common 20 A branch-circuit check, not a 25 A shortcut.wire
- What Size Breaker for 10 AWG Wire?For 10 AWG wire under the displayed defaults, the largest common breaker is 30 A for copper and 25 A for aluminum. This is the top small-conductor page before the breaker-wire series moves into larger appliance and feeder sizes.wire
- What Size Breaker for 8 AWG Wire?For 8 AWG wire under the displayed defaults, the largest common breaker is 50 A for copper and 40 A for aluminum. This is the first page after the small-conductor band, so termination temperature and equipment instructions become more important than the AWG label alone.wire
- What Size Breaker for 6 AWG Wire?For 6 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 70 A for copper and 50 A for aluminum. The 70 A copper result depends on the next-size-up path, so 60 C equipment and receptacle restrictions need an early check.wire
- What Size Breaker for 4 AWG Wire?For 4 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 90 A for copper and 70 A for aluminum. This is the last mid-branch page before the series moves into large feeder wire sizes.wire
- What Size Breaker for 3 AWG Wire?For 3 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 100 A for copper and 80 A for aluminum. The aluminum result depends on the next-size-up path, so aluminum substitutions and lug limits need a deliberate check.wire
- What Size Breaker for 2 AWG Wire?For 2 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 125 A for copper and 90 A for aluminum. The copper result is a next-size-up breaker-protection limit, not proof that the conductor can carry a full 125 A design load.wire
- What Size Breaker for 1 AWG Wire?For 1 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 150 A for copper and 100 A for aluminum. The copper result is a next-size-up breaker-protection limit, not proof that the conductor can carry a full 150 A design load.wire
- What Size Breaker for 1/0 AWG Wire?For 1/0 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 150 A for copper and 125 A for aluminum. The aluminum result is a next-size-up breaker-protection limit from 120 A usable ampacity, not a full 125 A load rating.wire
- What Size Breaker for 2/0 AWG Wire?For 2/0 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 175 A for copper and 150 A for aluminum. Copper lands on a standard 175 A step, while aluminum reaches 150 A through a next-size-up breaker-protection path.wire
- What Size Breaker for 3/0 AWG Wire?For 3/0 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 200 A for copper and 175 A for aluminum. The copper result is the common 200 A feeder check, while aluminum remains below 200 A.wire
- What Size Breaker for 4/0 AWG Wire?For 4/0 AWG wire under the displayed non-receptacle defaults, the largest common breaker is 250 A for copper and 200 A for aluminum. Both results depend on the next-size-up breaker-protection path, so load sizing and equipment limits need a separate check.wire
- What Size Breaker for 250 kcmil Wire?For 250 kcmil wire under the displayed non-receptacle defaults, the largest common breaker is 300 A for copper and 225 A for aluminum. This is a kcmil conductor page, not 250 AWG, and both results require feeder-scale equipment checks.wire