electrical installation services; electrical wiring services; services of electricians; installation services; installation of electrical wiring for buildings; installation and maintenance services; installation of electrical wiring; on site building project management; lighting system installation; installation of electric light and power systems; renovation, repair and maintenance of electrical wiring; installation, maintenance and repair of telecommunications equipment; maintenance and repair of electrical apparatus; installation, maintenance and repair of electrical and electronic apparatus for use in the field of automation; maintenance and repair of hardware for data processing apparatus; telecommunication wiring; installation, maintenance and repair of electrical lighting apparatus; construction work relating to the installation and maintenance of electrical systems