Thanks Tom,
So then wouldn't "BX" be considered the non grounded armored cable made until some time in the 60's? early 70's? And, was it no longer recognized by the NEC because of the grounding issue? I don't remember seeing AC cable until some time 80's. I know that armored cable disappeared for years and if it was a grounding issue I wonder why they didn't just put a full size ground conductor in it and keep it on the market.
