I wondered if those yellow bands did just say HIGH VOLTAGE, but as Nick has said, it looks as though by the time anyone was high enough to see them properly he would already be surrounded by the primary lines linking down to the transformers.

Wonder what happened to that short cross board at the left-hand side? I have a vision of a utility worker needing a small piece of board for some reason and sawing it off the end! [Linked Image]

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The only clue I have is that local utility estimators would gripe about requests for wye-secondary transformer banks, for they could not serve any of the routine 'Edison three-wire' services from it.
More confirmation I suppose of just how firmly America adopted delta configurations for secondaries in earlier times.


[This message has been edited by pauluk (edited 02-15-2004).]