In this tutorial we create a report based on a car dealership with a 3-phase TNCS supply. The installation comprises a workshop, showroom and offices. It has a separate valet bay having a steel structure, a steel water supply, and a steel air-line fed over-head from the workshop; the TNCS earthing system has been exported to this building. There is also a separate steel structure building used for tyre fitting. The earthing system for this building has been changed to a TT supply.