Every now and again, the “rules of thumb” go out the window. Here’s a couple of pics of plastic jacketed romex with no ground. Just a bundle of tightly twisted brown interleaving paper where the ground normally is. Not even a reduced size ground in the middle of that paper. I wonder during what years this was produced?
Probably in the early 70’s marc…or late 60’s as they started producing NM-B which had the 90 Degree rated insulation towards the end of the 70’s so my guess is pre-1972 possibly.
Ran into this yesterday actually…whole house had receptacles replaced with 3 prong plugs…and no ground present in the whole house…yet they LOVED them 3 prong plugs everywhere…
But I got them straight…and as usual explained their options…
Good guess Paul, I pulled a whole lot of that wire in the late 60’s and early 70’s when wiring houses. Loved it, it was so flexible and easy to handle. Ken