Installation of solar energy systems; electrical apparatus installation; electrical apparatus repair; electrical engineering services (construction); electrical installation services; electrical wiring services; installation of audio electrical apparatus; installation of electrical apparatus; interference suppression in electrical apparatus; maintenance and repair of electrical apparatus; maintenance, installation and repair of electrical items and equipment; repair of electrical appliances; residential, commercial and industrial installation and repair of electrical and computer wiring and cabling; installation of communications network apparatus; installation of communications network instruments; maintenance and repair of communications systems; maintenance and repair of data communications networks; installation of instrumentation systems; installation of data network apparatus; installation of data processing apparatus; maintenance and repair of data communications networks; maintenance and repair of data processing apparatus; maintenance and servicing of data processing installations; maintenance of data communication networks; maintenance of data processing apparatus; installation of security systems; maintenance and servicing of security alarms; installation of electronic apparatus; installing of electronic communications networks; maintenance and repair of electronic apparatus; maintenance and repair of electronic installations; maintenance of electronic measuring devices; maintenance of electronic monitoring devices; maintenance of electronic testing devices; repair of electronic apparatus; repair of electronic business equipment