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Step-by-step wizards with the Controls 101 safety net on every question.
Circuit & Wiring Reference
Breaker sizes, wire gauges, and connection types — always confirm against the appliance's data plate and local code.
| Appliance | Voltage | Circuit | Wire | Connection |
|---|---|---|---|---|
Range / Oven (freestanding) Older homes may have a legal 3-wire 10-50; new installs require 4-wire with separate ground and neutral. | 240V | 40–50A double-pole dedicated | 8 AWG copper (6 AWG for 50A long runs) | NEMA 14-50 receptacle (4-wire) |
Wall oven (built-in) Built-in ovens vary widely — always wire from the data plate, not by rule of thumb. | 240V | 20–40A double-pole per nameplate | 12–8 AWG per nameplate | Hardwired junction box |
Electric water heater No receptacle needed; the breaker (or a lockable switch) is the required disconnecting means. | 240V | 30A double-pole dedicated | 10 AWG copper | Hardwired or flexible conduit |
Electric clothes dryer Match the cord to the receptacle — never use an adapter between 3-wire and 4-wire. | 240V | 30A double-pole dedicated | 10 AWG copper | NEMA 14-30 (4-wire) or legacy 10-30 (3-wire) |
Gas clothes dryer Only the motor and controls run on electricity; the heat comes from the gas burner. | 120V | 15A standard | 14 AWG | Standard 5-15 plug |
Dishwasher Modern code requires GFCI protection — check the under-sink outlet before assuming the dishwasher died. | 120V | 15–20A dedicated recommended | 14–12 AWG | Hardwired or cord to under-sink outlet |
Washing machine Modern code requires GFCI protection in laundry areas — check the Test/Reset buttons before assuming the washer died. Never on an extension cord. | 120V | 15–20A dedicated recommended | 14–12 AWG | Standard 5-15 plug (some European-style units aside) |
Refrigerator Dedicated circuit keeps other loads (microwave, hair dryer) from tripping the fridge's breaker and silently thawing your food. | 120V | 15–20A dedicated recommended | 14 AWG | Standard 5-15 plug |
Tankless water heater (electric) These can demand a service upgrade before install — verify with an electrician. Scale flushing is annual maintenance in hard-water areas. | 240V | Multiple 40–60A double-pole breakers — often 100–150A total | Per nameplate (commonly 8–4 AWG) | Hardwired |
Tankless water heater (gas) The gas line is sized by the unit's BTU input — often the real constraint. Keep intake/exhaust terminals clear of snow and nests. | 120V (controls & fan only) | 15A standard | 14 AWG | Standard 5-15 plug |
Full wire ampacity chart and breaker sizing rules are inTools & Materials.
