Although I'm not certain, I believe the two (ground and neutral) are terminated together at the meter, and are in parallel (terminated together also at the 200-amp distribution panel). The other outbuilding seems to be wired in a similar manner. I specifically recall multiple wires in the meter socket. One was approx. 3/0, and two under another lug approx. 3 ga. I'm guessing there were more 3/0 on the same bar for the other sevices. The two under the same lug is a violation.

I should complete the problem by adding that this is the place with 5VAC at the pool (water to ladder and rim) which the POCO is attributing to a neutral problem between a sub-panel and the pool. With all the power disconnected (but meter not pulled) there is still voltage at the pool (3V?). My meter is a newly calibrated Fluke. The only way I got the voltage to drop to zero was to pull the neutral feeding the pool house.

Dave