MV switchgear, Desing Temp 50 deg C, +derated calcs?

[JuanGomez]

Hi.

I'm designing a MV switchgear (6kV, 50Hz, 1000Amp) Metal-Clad, the temperature of design that I use are 50 degrees C. (very hot place)
I require transport 1,000 Amp (nominal and real) through incoming. I mean at desing temp 50ºC 1000Amp, maybe my busbar at 40ºC (temp at the IEC standard) is 1.500Amp.?

Which equipment will I calculate derated by temperature ?
- Bus bars (copper) ¿method to derate calculate, IEC standard?
- Breakers 6kv (Incoming, outgoings) ¿method to derate calculate, IEC standard?
- Current Transformers toroidal type (requires derated temp?)
- Voltage transformers (requires derated temp?)
- any more?

Apply Subclause 6.5 of IEC 60694?

Someone have an example?

Thanks in advance.
Juan Gomez