Sorry for coming in late, but there are a couple of points I'd like to make.
Here is a quote from the add linked in the OP.
It’s approved for use in a variety of applications, including residential branch circuits, manufactured housing, and pre-fabricated building structures.
Now look at the NEC definition of "approved". It is the Authority Having Jurisdiction that "approves" something. Not UL, not the manufacturer.
Secondly, UL does not write code. Jurisdictions do not adopt the UL listings, they adopt the NEC. If UL lists something for a particular use, but the NEC prohibits it's use, it is the NEC that has force of law and UL does not trump it.
300.15 requires that splices be made in a box. 314.29 requires those boxes to be accessible. 300.15(H) referes to 334.40(B) which allows switch, outlet, and tap devices of insulating material to be used with NM. The devices being discussed are not switch or outlet devices. Are they tap devices? Is a device that allows two conductors to be spliced a tap device? Even if they are tap devices, 334.40(B) only permits their use where the cable will be exposed or in existing installations where the cable is fished.
[This message has been edited by eprice (edited 01-31-2006).]
