NM-B temperature/amperage rating
I'm looking to hook up a new induction cooktop in place of an old resistance-style electric cooktop. To my surprise, the induction top actually needs more power than the one in-place now.
The instructions for the induction cooktop specify a 40 amp breaker, but note that a 10 gauge conductor with insulation rated at 90 degrees C would suffice. I take this to mean 10-3 NM-B cable would be fine. However, when I look at the specs for the NM-B cable I have, it states that its insulation is rated at 90 degrees C, but then notes that the ampacity should be limited to the rating at 60 degrees C, which I believe is only 30 amps.
So, the question I have is, can I replace the in-place 10-3 NM cable (from 1974 or so) with 10-3 NM-b and use a 40 amp breaker, or do I need to step up to 8-3? The run to the panel is about 25 feet.
Thanks, in advance.