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stationary machines, and related equipment. electricians may be employed in the installation of new electrical components or the maintenance and repair of existing electrical infrastructure. [ ] electricians may also specialize in wiring ships, airplanes, and other mobile platforms, as well as data and cable
safety switches, smoke alarm installation, inspection and certification and testing and tagging of electrical appliances. to provide data , structured cabling systems, home automation & theatre , lan , wan and vpn data solutions or phone points, an installer must be licensed as a telecommunications cable...
https://en.wikipedia.org/wiki/Electrician