A very good contribution, Yoopersup!
I would also point out similar language was added in 2011 to Article 342.30(A), referring to IMC.
That is, in brief, the requirements are for support within:
1) 36";
2) Where structural members are not present, within 60"; and,
3) Specifically not to require support within 36" of the weatherhead.
Interesting that both PoCo standards I referenced missed this detail.
How to support the mast? I have found two commercially available bracket kits.
One type is for rigid support, and is designed to work together with 3/4" pipe as the structural members. Considering the wording of the one PoCo standard (which referenced angle iron), I'd say that EMT is not adequate.
The other comes with some extremely light duty stainless aircraft cable.
IMO, the installation above would require the use of a rigid support method.
One matter that concerns me is the PoCo specification for carriage bolts. In my experience, it it is almost never possible to access the underside of the roof deck, or to even find the framing members. Both of the commercial kits I've used came complete with 5/16" lag bolts.
While extreme at this job site, the lack of support of service masts seems to be quite common.
