Wire Size by Amps

The NEC wire gauge for every standard circuit, from 15A branch circuits to 800A services. Each page shows the copper and aluminum size, the full ampacity table, and how distance and continuous loads change the answer.

CircuitCopper (75°C)Aluminum (75°C)Typical use
15 amps14 AWG12General lighting circuitsDetails
20 amps12 AWG10Kitchen and garage receptaclesDetails
25 amps10 AWG10Small motor loadsDetails
30 amps10 AWG8Electric clothes dryersDetails
35 amps8 AWG8Mid-size HVAC condensersDetails
40 amps8 AWG8Electric ranges and cooktopsDetails
45 amps8 AWG6Larger HVAC condensing unitsDetails
50 amps8 AWG6Electric rangesDetails
60 amps6 AWG4Sub-panels (small)Details
70 amps4 AWG3Large heat pumpsDetails
80 amps4 AWG2Large tankless water heatersDetails
90 amps3 AWG2Sub-panel feedersDetails
100 amps3 AWG1100A sub-panelsDetails
110 amps2 AWG1/0Feeder circuitsDetails
125 amps1 AWG2/0125A sub-panelsDetails
150 amps1/0 AWG3/0150A sub-panelsDetails
175 amps2/0 AWG4/0175A feedersDetails
200 amps3/0 AWG250 kcmil200A main service entrancesDetails
225 amps4/0 AWG300 kcmil225A feedersDetails
250 amps250 kcmil AWG350 kcmil250A feedersDetails
300 amps350 kcmil AWG500 kcmil300A feedersDetails
350 amps500 kcmil AWG700 kcmil350A feedersDetails
400 amps600 kcmil AWG2 sets of 250 kcmil400A service/feedersDetails
450 amps700 kcmil AWG2 sets of 300 kcmil450A feedersDetails
500 amps2 sets of 250 kcmil AWG2 sets of 350 kcmil500A feedersDetails
600 amps2 sets of 350 kcmil AWG2 sets of 500 kcmil600A servicesDetails
800 amps2 sets of 600 kcmil AWG3 sets of 400 kcmil800A servicesDetails

Sizes follow NEC Table 310.16 (75°C column) with the 240.4(D) small-conductor limits applied. For reference only — verify against the current code and local amendments before installing.