If the utility transformer supplying a service is outside the building, is a grounding connection required outside the structure?

A grounding connection is not required outside the structure if the utility transformer supplying the service is located outside. This is because the grounding requirements for utility transformers typically focus on ensuring that the equipment itself and the system are properly grounded according to the utility's standards and the National Electrical Code (NEC) guidelines.

In many cases, the utility transformer is grounded at its location, which provides the necessary grounding for the service it supplies. The electrical system of the building will have its own grounding electrode system that meets the necessary local and national codes once the service enters the building.

This grounding setup can vary based on specific conditions and local regulations, but the general rule allows for the elimination of the need for an additional grounding connection outside the structure itself when the transformer is positioned outside.