What is the terminal temperature for low voltage circuit breaker?

25 February 2020 0 4K Report

As per Schneider Electric website "https://www.se.com/uk/en/faqs/FA290363/" it states that 90 degrees cables are not permitted on NSX MCCB.

Usually, we use 90 degrees cables with their 90 degrees ampacities.

for example per the NEC table Table 310.15(B)(16) a 500 AWG conductor rated @ 750C has an ampacity of 380 and the same conductor diameter has an ampacity of 430 @ 900C.

My question is when can I use 900C ampacities? most of the costs are in the cables and they are the ones most difficult to replace under roads, under buildings in trenches and etc.

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