I had this experience this week, before I saw thread. I called Southwire, spoke to an App Engineer. Went back next AM & looked at the conductors again. Yes, faintly, on the 'back side' in Ink Jet' print THWN, etc.
I sent an e-mail to the App Eng regarding the difficulty of reading the designations, and asked 'why' it all could not be the nice, large, white printing. His reply (quickly) was that the 'SimPull-THHN" is to let the supply houses know what's on the spool. DUMB?? IMHO, yes!
THe EC at this job was a happy guy when I finally saw the "W".
As to a comment above regarding 'dust pick-up', I have to that is true based on the install I was inspecting.
Also, I thought that it was quite 'odd' for a straight designated insulation rating on this wire....as most if not all has been multi-type designation for quite some time.
Don: I did the same thing you did...saw the readable print....and didn't even think to search for the 'fine print'....
Yes, to be human
John:roll: