Wire dimension & Amp RatingsAmpacity 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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|Wire Gauge Size||60°C (140°F)NM-B, UF-B||75°C (167°F)THW, THWN,SE, USE, XHHW||90°C (194°F)THWN-2, THHN,XHHW-2, USE-2||75°C (167°F)THW, THWN,SE, USE, XHHW||90°C (194°F)XHHW-2, THHN,THWN-2|
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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