My understanding is that, in general, you will not find UL listing/labeling for MV equipment. Also, the 90 deg C and 105 deg C at MV is similar to the 75 deg C and 90 deg C at low voltage. Yes, cable is 105 deg C, and you may find splice and termination kits that are rated for 105 deg C (although I beleive the 3M Cold Shrink are only rated for 90 deg C) but you will find that according to manufacturing standards, that only 90 deg C terminals are available.