Wire dimension & Amp Ratings

Ampacity is the maximum current that a conductor can bring continuously under the conditions of usage without exceeding that temperature rating. Present is measure in amperes or “amps.” You need to use the correct size wire because that the existing (load) requirement of the circuit to avoid the cable from overheating.The number and kind of electric devices associated to a circuit recognize the ampacity requirement of the conductor. Usually, a general-purpose residence circuit is designed for 20 amps. Lighting circuits may be design for just 15 ampsTo calculation the fill requirement because that a circuit, an initial add increase the wattage of all the electrical tools that will certainly be ~ above the circuit. Then, divide the full wattage by the voltage of the system, commonly 120 or 240, and also that will offer you the required present or amps.

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CopperAluminum
Wire Gauge Size60°C (140°F)NM-B, UF-B75°C (167°F)THW, THWN,SE, USE, XHHW90°C (194°F)THWN-2, THHN,XHHW-2, USE-275°C (167°F)THW, THWN,SE, USE, XHHW90°C (194°F)XHHW-2, THHN,THWN-2
14152025------
122025302025
103035403035
84050554045
65565755055
47085956575
3851001157585
29511513090100
1---130145100115
1/0---150170120135
2/0---175195135150
3/0---200225155175
4/0---230260180205
250---255290205230
300---285320230260
350---310350250280
500---380430310350
600---420475340385
750---475535385435
1000---545615445500

Ampacities are based upon the 2017 NEC and do no reflect any type of temperature correction or ampacity adjustments that may be required. Please consult a default electrician or experienced engineer to recognize the suitable values for your particular application.


Our new Ampacity Calculator app can aid determine the ampacity that conductors in conduit, cable, or directly hidden wires.

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