Roger has brought up a great example of yet another possible "Monkey Wrench", for which NFPA may toss into the cogs of the grand machinery.
The Article designates "Grounded Circuit", instead of (IMHO) should have been designated "Grounded System".
To me, the intentions sure point towards the ideal of using dual rated, or slash rated Breakers on Branch Circuitry which would include a Circuit having higher Voltage to Ground than the device is rated (such as a 2 wire single phase 240 volt circuit connected to B & C on a 4 wire delta, or B & C on a 3 wire corner grounded delta).
However, the inclusion of "Grounded Circuits" leaves room for several interpretations!
I see this as a valid argument, and never second-guessed it until now!
Scott35
