Which NEC element contains ampacity tables?

Which NEC element contains ampacity tables?

• A. Neutral conductor color codes
• B. Conductor testing procedures
• C. Ampacity tables
• D. Ambient temperature correction factors

Answer: (C)

Ampacity data, the current-carrying capacity of a conductor, is presented in dedicated tables that specify maximum amps for different conductor sizes, insulation types, and temperature ratings. These ampacity tables are the go-to reference you use to size conductors and are located in Article 310 of the NEC. After pulling the base ampacity from the appropriate table, you may apply ambient temperature correction factors (also part of NEC calculations) to adjust the value for your specific installation conditions, but the actual tables that list the current ratings are the ampacity tables themselves. The other items listed—neutral color codes or conductor testing procedures—do not contain the ampacity data.

Ampacity data, the current-carrying capacity of a conductor, is presented in dedicated tables that specify maximum amps for different conductor sizes, insulation types, and temperature ratings. These ampacity tables are the go-to reference you use to size conductors and are located in Article 310 of the NEC. After pulling the base ampacity from the appropriate table, you may apply ambient temperature correction factors (also part of NEC calculations) to adjust the value for your specific installation conditions, but the actual tables that list the current ratings are the ampacity tables themselves. The other items listed—neutral color codes or conductor testing procedures—do not contain the ampacity data.