Originally Posted By: jpeck
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Joe T., Bob B., Rob, and anyone,
House today had 600 amp service with Cutler-Hammer Commercial breakers, labeled as being only 40 degrees C.
That means that all components in that enclosure must be used at their 40 degree C rating, right?
The NEC 310-15 charts only go down to 60 degree C. What is the reduction factor to 40 degree C? Is there any?
I know that is the insulation rating, but the limitation will be the termination rating (40 degree C). Any reduction in ampacity for the conductors?