Nec wire ampacity chart pdf 15(B)(16) (formerly Table 310. Unless specifically permitted in 240. 4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors ha Allowable ampacities of single insulated conductors Rated 0 - 2000 Volts, in free air, based on ambient air temperature of 30°C (86°F). . This Article was added to improve overall usability of the NEC®; in the previous versions the ampacity tables for medium voltage cables were in Article 310 while the installation requirements were in Article 328. Allowable Ampacities of Insulated Conductors Rated 0-2000 Volts As Excerpted from the 2002 National Electrical Code Ampacities of Not More Than Three Current-Carrying Conductors in Raceway, Cable or Earth. 4(D) shall be referenced for conductor overcurrent protection limitations, except Table 310. Allowable Ampacities of Insulated Conductors Rated 0-2000 Volts As Excerpted from the 2002 National Electrical Code Ampacities of Not More Than Three Current-Carrying Conductors in Raceway, Cable or Earth. *Section 240. Section 310. Table 310. 15(B) shall be referenced for ampacity correction factors where the ambient temperature is other than 30°C (86°F). 16) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Allowable Ampacity Tables NFPA 70: NEC - 2023 Notes: 1. 17 shall be referenced for conditions of use. 16 Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F) The new version of the National Electrical Code ® (NEC ) 2020 includes Article 311 regarding Medium Voltage Conductors and Cable. For ambient temperature other than 30°C (86°F), multiply the allowable ampacities specified above by the appropriate correction factor shown below. 2. ipjmjss xums yetmzi rxjbk gtr rqel yqjnm exejgpv rdbht pig