Having been challenged about the 125% rule when sizing circuits, and being too damn lazy to chase it down in NFPA 70 myself, passed the challenge along to my son who hasn't acquired many of his father's habits, YET.
He is still a relative young-in at 52 so there is still time.
His response as follows:
----------------------------------------------------- Regarding your concern about the 125% rule, this is covered in the code.
See 210.19(A)(1)(a), and 210.20(A).
---------------------------------------------------- Have fun.
Lew