It is red. That was sort of a trade mark for one manufacturer but now everybody makes it in red.
It is technically “temporary hookup cable”. It can only be used (NEC/UL) for temporary MV jumpers. This is the only type of unshielded wire over 2 kV NEC allows. Inside enclosures like SIS it is a “component” so legal for use. The assembly is Listed, not the components. It is unshielded so bend radius is 6x OD. This is acceptable because everything is lashed down, spaced with glastic spacers and lots of cable ties. The air space around the cable is important too. So a 5 kV rated cable might operate at 15 kV. If it touches itself the rating is NOT 5 kV. I have tons of photos of manufacturers that screwed up installations by failing to follow MV installation practices and laid it against grounded metal or each other. It takes 5-10 years for 4160 to eat itself, only months at 13.5 kV.
If you are trying to do this yourself in an NEC environment the best trick we have found is cut the jacket/shielding/semicon way back. The termination kits specify a minimum overall length, not a maximum. Give yourself plenty of room. Nothing wrong with 24” of insulated (but not shielded) cable before ending at the lug. If there is no vertical space most switchgear offers a “high hat” accessory that is just an extended enclosure on top. Also tape terminations are 6-9” long. Shrink kits are 12-15” or more. The bend radius of the unshielded cable is same as what you are seeing. Only thing is it’s unshielded so you MUST take steps to ensure the cables don’t get under the minimum allowable spacing or they will track and fail prematurely.
When ordering if the manufacturer offers a “termination” or “wiring” cabinet, buy it. You won’t be sorry. We are distributors for a popular MV company and I’ve personally learned this lesson the hard way myself.