Q. When are conductors permitted to be terminated based on the 90°C temperature rating and ampacity as given in Table 310.60(C)(67) through Table 310.60(C)(86)?

 

 

 

  1. Conductors are only permitted to be terminated based on 60°C temperature and ampacity ratings.
  2. Conductors are only permitted to be terminated based on 75°C temperature and ampacity ratings.
  3. Conductors are permitted to be terminated based on 90°C temperature and ampacity ratings in accordance with 110.40.
  4. It is not permitted in the NEC.

Answer: C

As noted in 110.40, it is permitted to terminate conductors based on the 90°C temperature rating and ampacity as given in Table 310.60(C)(67) through 310.60(C)(86). This differs from the requirements in 110.14(C)(1), which will not allow this.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.