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Find the allowable ampacities of copper and aluminum conductors in raceway, cable or earth based on temperature rating and size. See the table excerpted from the 2002 National Electrical Code and the notes for different types and locations.
*Refer to 310.15(B)(2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F). **Refer to 240.4(D) for conductor overcurrent protection limitations. 310.15 ARTICLE 310 — CONDUCTORS FOR GENERAL WIRING 70–154 NATIONAL ELECTRICAL CODE 2011 Edition
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.
Find the allowable ampacities of insulated conductors based on NEC Table 310.15 (B) for single-phase dwelling services and feeders. Compare the ampacity values for different sizes, types, and temperature ratings of conductors.
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Find the allowable ampacities of insulated conductors rated 0 through 2000 volts, 60°C through 90°C, based on ambient temperature and conductor type. See the correction factors for ambient temperatures other than 30°C (86°F).
NEC Table 310.16, formerly Table 310.15(B)(16): Ampacities of Insulated Conductors with Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried)
