stevenal wrote:
No one has answered the question yet, so I will make an attempt. Actual IE exposure will occur from the time of the fault to the time of interruption, and the decaying current will have an effect. Current at the time of interruption will lead to the least conservative IE value (less than actual), therefore use the initial current value to get a more conservative result.
Don't forget that if the current gets low enough for the TCC to quit the instaneous (or similar) region at the lower current, the real IE can go up. If it stays in that region, then you're correct.