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The following home services are supported by discrete wiring systems: Information and communications Entertainment Energy management Security and safety Digital home health Aged and assisted living Intelligent lighting and power In new home construction, wiring for all electrical services can be installed before the walls are finished.
Wiring systems in buildings may be subject to frequent alterations. Frequent wiring changes are made simpler and safer through the use of electrical conduit, as existing conductors can be withdrawn and new conductors installed, with little disruption along the path of the conduit. A conduit system can be made waterproof or submersible.
Several other types of wiring systems are used for building wiring in the United States; these include corrugated metal armored cable, mineral-insulated cable, other types of power cable, and various types of electrical conduit. In industrial applications cables may be laid in cable trays.
The first electrical systems to make use of insulators were telegraph lines; direct attachment of wires to wooden poles was found to give very poor results, especially during damp weather. The first glass insulators used in large quantities had an unthreaded pinhole.
Shield wires on transmission lines may include optical fibers (optical ground wires/OPGW), used for communication and control of the power system. HVDC Fenno-Skan with ground wires used as electrode line. At some HVDC converter stations, the ground wire is used also as the electrode line to connect to a distant grounding electrode.
Sandwich Plate System (SPS) is the name of a patented structural composite material comprising two metal plates bonded with an elastomer core. SPS was created in partnership with chemical manufacturer BASF incorporating Elastocore ® [ 1 ] as the core material.
Seven inches beneath the floorboards of what was likely once a house for Viking slaves, a team of archaeologists found four heavy silver bracelets, all with different decorations, likely from over ...
Long-distance electromagnetic telegraph systems from 1820 onwards [a] used two or more wires to carry the signal and return currents. It was discovered by German scientist C.A. von Steinheil in 1836–1837, that the ground could be used as the return path to complete the circuit, making the return wire unnecessary. [2]