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Whenever we need to need how many amps a wire can handle, we turn to the NEC 310.16 table. The 310.16 table is basically an ampacity chart; it tells us what is the ampacity of copper and aluminum wires.
Simplify complex wire ampacity calculations with Cerrowire’s convenient Online Ampacity Calculator. This intuitive calculator takes the guesswork out of electrical code compliance, ensuring you select the right conductor size for your specific application.
Ampacities of Insulated Conductors From NEC Table 310.16 (2020 edition) Not More than Three Conductors in Raceway, Cable or Earth (Directly Buried) (Based on Ambient Temperature of 30° C, 86° F)
People also ask
What temperature does the NEC ampacity chart specify?
What is a wire ampacity rating chart?
What is the NEC 83% rule for wire ampacity?
How do I calculate the ampacity rating of a wire or conductor?
Calculate the maximum allowable wire ampacity for an insulated conductor as directed by the most recent NEC ampacity tables and charts.
This site offers many simple-to-use calculators and wire ampacity charts to aide you in properly sizing wire and conduit in compliance with the NEC. Visit the Calculators and Tables pages for a complete list of resources.
NEC TABLE 310.15(B)(16)- ALLOWABLE AMPACITY FOR 600V CONDUCTORS. Per NEC 310.15(B)(5), the ampacity of 4/C cables shall be reduced by a factor of 0.80 when the neutral is considered a current-carrying conductor.
According to the 83% NEC rule, a wire for 100 amp service has to handle at least 83 amps (have at least an 83A ampacity). That means that we don’t have to use the 4 AWG wire; we can use the 3 AWG wire because it has 85A ampacity which is higher than the 83A required ampacity.
