In my opinion, if it wasn't for the language in 336-18, duct tape would be perfectly acceptable for securing NM cable. After all, that NASCAR 200 MPH duct tape seems to hold pretty good (Tongue in cheek).
BTW, some duct tape is now UL listed for it's intended use.
Few things are harder to put up with than the annoyance of a good example.
I was involved with some wiring on one of the 3M buildings in St. Paul MN back in the early 80s. This particular building was used for research of reflective sheeting and adhesives.
I think of this every time I hear the term duct tape. One of the techs that worked there told me the story of how this product was developed. They needed a flexible but very strong tape, and someone came up with the idea of applying adhesive to cotton fabric. The strongest weave of that day was known as cotton duck (e.g. Carharts), hence the name duck tape. It wasn't until other manufacturers started producing their own versions of the product that it was incorrectly labeled as duct tape.
Tape is normally refered to by the product that it is made of, not what it is used for. For example, plastic tape, rubber tape, cambric tape, cellophane tape, etc.
Nope, totally different story there LOL. I think I'll have to stay with the guy from Minnesota mining and manufacturing, the cotton duck fabric just seems to me a more logical beginning. I know that a lot of my old duck hunting clothes were made of cotton duck material.