90 deg rating for low voltage feeder

[mshields]

For a feeder originating in a RussElectric 1558 switchgear and terminating in a switchboard I will be specifying but definitely UL891 group mounted type. Cable would terminate to the main breaker which will be an 1800A ICCB (although I could make it an APCB if that helped. I'm wondering if there is a way I can utilize the 90 degree rating of the cable. Will/can the terminations on both ends of this run be rated for 90 degrees?

 

[tortuga]

You might talk with RussElectric and see ? It might be possible to use doubble lug crimps land on a open section of buss or somthing, but even then I dont think Insulated case circuit breakers have a 90C listing, you'll still run into 110.14(C)(1).
You can find ICCB's at a '100%' load rating but still limited to 75C terminations.
When I run into issues like this I look over the load calcs again.
Curious to see what others experience is.

 

[don_resqcapt19]

Why would you want to use the 90°C ampacity? If I am the owner that is paying the electric bill, I will be paying for the addition I²R losses for the life of the installation. The the load is anywhere near the ampacity of the conductors and fairly continuous, I will be money ahead to install the larger conductors to start with.

 

[tom baker]

Your questions has a lot of abbreviations.
Your question " Will/can the terminations on both ends of this run be rated for 90 degrees?" is not something we can answer, its dependent on the mfg what they supply and how its terminated, to a bus or 100% rated breaker. But like Don said, there could be a significant volt drop esp as it seems this is an 1800 amp service.
Often where there is an application for 90C ratings its an existing raceway and the smaller size is needed.