4
Electrical energy; Electrical energy from non-renewable sources; Electrical energy from renewable sources
9
Scientific and laboratory devices for treatment using electricity; Apparatus, instruments and cables for electricity
37
Extraction of natural resources; Building, construction and demolition; Rental of tools, plant and equipment for construction, demolition, cleaning and maintenance; Computer hardware and telecommunication apparatus installation, maintenance and repair; Renovation of machinery; Maintenance of automata; Emergency servicing of apparatus for supplying electricity; Services of electricians; Maintenance and repair of electronic apparatus; Maintenance and repair of electronic installations; Maintenance of electronic apparatus; Repair of electronic apparatus; Repair or maintenance of electronic machines and apparatus; Repair services for electronic business equipment; Installation of electric light and power systems; Repair or maintenance of power distribution or control machines and apparatus; Electrical installation services; Installation of electrical and generating machinery; Renovation of electrical wiring; Renovation, repair and maintenance of electrical wiring; Electrical wiring services; Electric appliance installation and repair; Repair of electrical equipment and electrotechnical installations; Repair of electrical equipment; Maintenance and repair of electrical earthing systems; Repair of energy production plants and machines; Installation of energy-saving apparatus; Repair of energy supply installations; Maintenance and repair of energy generating installations; Maintenance of power generating apparatus and installations; Maintenance, servicing and repair of power generating apparatus and installations; Repair of power generating apparatus and installations; Servicing of power generating apparatus and installations; Installation of power generating apparatus; Repair services for electric generators and wind turbines; Maintenance and repair of electricity generators; Cleaning of electrical motors
40
Generation of gas and electricity; Production of electrical power from renewable sources; Electricity generating; Generation of power; Consultancy services relating to the generation of electrical power
42
Testing of apparatus in the field of electrical engineering; Testing of apparatus in the field of electrical engineering for certification purposes; IT consultancy, advisory and information services; Electrical engineering services; Engineering services in the field of energy technology; Mechanical engineering