Stripped the jacket off? That's an easy answer to find!
According to the UL White Book, "Type SE cable contains type RHW, RHW-2, XHHW, XHHW-2, THWN, or THWN-2 conductors." A further note, one that I missed yesterday, says the cable has a temp rating of 75, unless the type designation of the conductors is marked on the outer jacket, in which case the rating of the conductors is also the rating of the cable.
