Related Resources: instrumentation

Allowable Ampacities Aluminum and Copper-Clad

Instrumentation, Electronics and Control Sensors

Allowable Ampacities Aluminum and Copper-Clad Conductor per. (NEC) NFPA70

Temperature Rating of Aluminum or Copper-Clad Conductor

Rated 0-2000 Volts, 60° to 90°C (140° to 194°F), in Raceway or Cable or Earth (directly buried). Based on ambient air temperature of 30°C (86°F).

† Unless otherwise specifically permitted elsewhere in this Code, the over current protection for conductor types marked with an obelisk (†) shall not exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10 copper, or 15 amperes for No. 12 and 25 amperes for No. 10 aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied. Adapted from NFPA 70-1993, National Electrical Code

National Electrical Code Allowable Copper Conductor Ampacities
2017 Edition of the National Electrical Code (NEC) NFPA70

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