- Power factor correction plants
- Water treatment plants
- Pumping plants
- Waste transfer plant
- Waste water conditioning plants
- Chemical plant installations
- Demineralising plants
- Desulphurization plant
- Distillation and rectification plant
- Alcohol distillation plants
- Pharmaceutical plants
- Deionization plants
- Digestion plants
- Compost plants
- Plants for manufacturing activities
- Electrical and instrumental plants for off-shore gas/oil extraction fields
- Electrical and instrumental plants for on-shore gas/oil extraction fields
- Electrical and instrumental plants for on-shore
- Oil refining plants
- Oil terminal plants
- Gas terminal plants
- Earthing systems and protection from atmospheric discharge plants
- Fire alarm plants
- Anti-intrusion plants
- Telecommunication plants
- Electrical and instrumental plants on gas/steam turbines
- Public lighting plants
- Street lighting plants
- Railway and airport signalling plants
- Civil electric plants
- Electrical and instrumental maintenance services
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