Correct me if I'm wrong but doesn't IEEE Std 1584 cater for this by taking the higher of the two incident energy values calculated (first from the arcing current [Iarc] and then a reduced arcing current [Iarc_min])?

Section 4.5 of 1584-2018 states the following...

**Quote:**

Calculate a second set of arc duration, using the reduced arcing current to determine if the arcing current variation has an effect on the operating time of protective devices and consequently incident energy.

See the attached image which illustrates a big difference in arc durations for arcing current and reduced arcing current.

Attachment:

TCC_Iarc_and_Iarc_min.png