The AHJ requires 3 pole disconnects for this service. I may be overlooking something but Im pretty sure thats the way its installed.
There's a difference between having a disconnect open all lines and having a fuse in the grounded conductor. A 3p breaker can be used because an overload on the grounded conductor will open all lines, but the same will not happen with three fuses.
Touching a grounded Delta conductor is no different from, or more dangerous than, touching a grounded neutral conductor. Still, we treat either one as an energized conductor past the point of system bonding, and for the same reasons.
It's also kinda funny how hard it is to see that a grounded conductor on a Delta is really the same as a grounded conductor on any other system. A neutral isn't any "safer" or "better" or "less insane" to ground than any other system conductor.
The only reason any supply conductor has a specific voltage to ground is because of the conductor that we intentionally ground. If we grounded one end of a 120/240v secondary instead of the center tap, we'd have one 120v and one 240v conductor.
The voltage between any pair of conductors will not change with a change of which conductor we ground; only the voltage to ground of each conductor will. Gounding basically creates an "earthly" extension of the grounded conductor.
