Marc, it would be very rare to find a utility transformer that would have been connected phase to phase. The primary on that transformer is in the 8.66 kV class or 15 kV grounded wye. You guess of 7.2 kV is much more accurate and it could be as high as 7.62 kV. Outside of that range is unusual
but possible. Some electric utilities work outside of that range, I know of some experimentation with a 23 kV distribution system but (I think) the idea was abandoned.
The bottom line is that this boy doesn't have a clue about how dangerous the stuff in his hands can be to him.
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Charlie Eldridge, Indianapolis,
Utility Power Guy