Not in California! IMO this practice is dangerous (it intentionally runs current in a path that will divert some of it through the ground), and California has

Not in California! IMO this practice is dangerous (it intentionally runs current in a path that will divert some of it through the ground), and California has banned it for a long time. In CA, there may be a “primary neutral” that is grounded, but it’s not grounded in multiple places, and the transformer inputs are insulated as if the primary neutral is not grounded. (I think the actual motivation for the ban is that ground currents are dangerous to cattle.)