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; central heating installation; heating equipment installation; heating equipment installation and repair; heating equipment repair; installation of apparatus for heating; installation of central heating; installation of heating apparatus; maintenance and repair of heating; air conditioning apparatus installation and repair; installation of apparatus for air-conditioning