Fill in the blank.

The NEC requirement for arc energy reduction now includes the following choices: __________.

A) an instantaneous trip setting that is less than the available arcing current
B) an instantaneous override that is less than the available arcing current
C) both A and B above
D) neither A or B above

Find the Answer

Answer: C

As noted in Sec. 240.87(B) of the 2017 NEC, these two methods are approved to reduce the clearing time:

(5) an instantaneous trip setting that is less than the available arcing current, and

(6) an instantaneous override that is less than the available arcing current.

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 [email protected].