Execution of extension works of 3 KVdc electric traction and power supply systems (substations and cabins) and attributable (by way of example but not limited to) to the following macro-categories:

- full line TE systems,

- station TE systems,

- TE protection, grounding and return circuit,

- switchgear control panels and relative cable connections,

- TE monitoring, indication and safety signs,

- grounding of l masses along the line,

- power plants.