It is very tough to guess or know what each areas POCO wants. Some POCOs require the top stick of pipe to be a full stick, the cut one goes at the bottom.
Personally that is also how I do it, on the few masts I have done I have not relied on a coupling to hold the drop. I have seen a few broken conduits and the break is always at the closest thread to the coupling. Of course that is just a personal preference not an NEC requirement.
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Bob
