The new stuff differs mainly in that the ground wire is aluminum, full size (for the ampacity), and separate from the jacket.
My own suspicion is that this is a product that is intended to replace both AC and MC. Don't be surprised if, in a few code cycles, the sections on AC and MC get combined, and the "normal" products are no longer made.
Re: New MC all purpose cable#100279 11/08/0610:17 PM11/08/0610:17 PM
From what I've been told by an AFC (Southwire competitor) engineer, AC and MC cables are treated differently when it comes to listing. AC cable has to meet pre-established specifications, and MC is subject only to performance testing.
AC & MC were under the same NEC Article (334) up until '78
Re: New MC all purpose cable#100280 11/09/0604:24 AM11/09/0604:24 AM
While back a supply rep had some at the supply house - that was several months ago... From what I understand, they were still seeking approval for connectors for it to be approved as a ground path. Did they sort that out yet?
Mark Heller "Well - I oughta....." -Jackie Gleason
Re: New MC all purpose cable#100281 11/09/0612:55 PM11/09/0612:55 PM
I guess I'm not a big fan of the idea because I've seen what can happen to other mechanical grounds on RMC, EMT, etc. I still always run a ground wire and bond (pigtail) to my metal boxes. Gounding is a safety issue, and I hate to think of what can happen as a result of loose or improperly installed connector. I've seen a lot of "solutions" and "time-saving" devices that have tried to circumvent a wired-in ground, but I trust none of them. IT's not worth the extra minute or two it might save. IMHO.
Re: New MC all purpose cable#100282 11/09/0607:44 PM11/09/0607:44 PM