Hmmmm,
Just to be sure, I went and stripped off about 3-feet of jacket on some aluminum SE and SER cables I have in stock and I couldn’t find any markings on the individual conductors, not even a voltage rating.
It seems that stripping the jacket off SE cable and using the unmarked conductors in that manner would be on par with stripping the sheath off NM-B cable and using the unmarked conductors for wiring up a #2 fuel oil pump, because we are sure they are gas and oil resistant THHN insulation.
