voltage and temperature correction for current

Hello all,

I have a question for inverter rated current calculations. I am using G120C and my rated voltage iis 480 V and temperature will be around 25 C. Now in data sheet rated currents are given for 400V only. I want to know how I can do voltage and temperature correction for calculation of drive rated input and output currents. Another thing: I am assuming 150% max current for switchgear selection, is it ok or too excessive?

Thanks,

Kbv.