interference suppression in electrical apparatus; heating equipment installation; residential, commercial and industrial installation and repair of computer wiring cabling; electric appliance repair; repair of electrical appliances; electric apparatus installation; installation of electrical apparatus; electric appliance installation; electrical wiring services; electrical installation services; electric appliance installation and repair; plumbing; installation of electricity generators; heating equipment installation and repair; construction; machinery installation; electric apparatus repair; maintenance and repair of electrical apparatus; installation and repair of telecommunication apparatus; maintenance and repair; installation and repair of air-conditioning apparatus; repair or maintenance of construction machines and apparatus; maintenance and repair of heating systems; construction work relating to the installation and maintenance of electrical systems; installation of electrical wiring for buildings; installation, maintenance and repair of industrial machinery; installation, maintenance and repair of manufacturing machines and apparatus; installation, maintenance and repair of solar energy systems; maintenance and repair of gas and electricity installations; installation, maintenance and repair of electrical equipment; installation of audiovisual equipment; installation of apparatus for recording, transmission or reproduction of sound or images; fire alarm installation; fire alarm installation and repair; repair of electronic apparatus; maintenance and repair of electronic installations; installation, maintenance and repair of electrical and electronic apparatus and equipment; maintenance and repair of electronic apparatus; maintenance of plumbing; installation of lighting systems; maintenance and repair of telecommunications apparatus; burglar alarm device installation and repair