Hi Frank,
You need to be aware that the center (neutral) tap is also grounded at the transformer location (on the pole), so, in theory, even if the neutral to ground bond were lifted at the service panel, the neutral is still grounded (at the pole).
To follow up on something Paul said, within the premesis wiring, the neutral is bonded to ground at only one point (the main service panel), and remains separate at all points downstream.
Just an idea here - you can play around with this idea some at safer voltages by getting a 12/24V stepdown transformer, using the center connection as we use a neutral.
Radar
