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  2. Knob-and-tube wiring - Wikipedia

    en.wikipedia.org/wiki/Knob-and-tube_wiring

    Earthing systems. v. t. e. Knob-and-tube wiring (sometimes abbreviated K&T) is an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s. [1][2] It consisted of single-insulated copper conductors run within wall or ceiling cavities, passing through joist and stud drill-holes via ...

  3. Open-channel flow - Wikipedia

    en.wikipedia.org/wiki/Open-channel_flow

    Open-channel flow. In fluid mechanics and hydraulics, open-channel flow is a type of liquid flow within a conduit with a free surface, known as a channel. [1][2] The other type of flow within a conduit is pipe flow. These two types of flow are similar in many ways but differ in one important respect: open-channel flow has a free surface ...

  4. Underground power line - Wikipedia

    en.wikipedia.org/wiki/Underground_power_line

    An underground power line provides electrical power with underground cables. Compared to overhead power lines, underground lines have lower risk of starting a wildfire and reduce the risk of the electrical supply being interrupted by outages during high winds, thunderstorms or heavy snow or ice storms. An added benefit of undergrounding is the ...

  5. Fracking - Wikipedia

    en.wikipedia.org/wiki/Fracking

    [citation needed] The method by which the fractures are placed along the wellbore is most commonly achieved by one of two methods, known as "plug and perf" and "sliding sleeve". [96] The wellbore for a plug-and-perf job is generally composed of standard steel casing, cemented or uncemented, set in the drilled hole.

  6. Computational methods for free surface flow - Wikipedia

    en.wikipedia.org/wiki/Computational_methods_for...

    Computational methods for free surface flow. In physics, a free surface flow is the surface of a fluid flowing that is subjected to both zero perpendicular normal stress and parallel shear stress. This can be the boundary between two homogeneous fluids, like water in an open container and the air in the Earth's atmosphere that form a boundary ...

  7. Electrical conduit - Wikipedia

    en.wikipedia.org/wiki/Electrical_conduit

    Galvanized rigid conduit (GRC) is galvanized steel tubing, with a tubing wall that is thick enough to allow it to be threaded. Its common applications are in commercial and industrial construction. [1] It is designed to protect wire and connectors. Intermediate metal conduit (IMC) is a steel tubing heavier than EMT but lighter than RMC. It may ...

  8. Ground-level power supply - Wikipedia

    en.wikipedia.org/wiki/Ground-level_power_supply

    A number of ground-level power supply systems were developed from the 1970s through the 1990s, [8] but were not reliable or safe enough for commercial use. [9]The first ground-level power supply system developed to modern safety standards was the Ansaldo Stream, [7] although a competing system, Alstom APS, was the first to be commercially implemented in 2003.

  9. Browser hijacking - Wikipedia

    en.wikipedia.org/wiki/Browser_hijacking

    A program called "Conduit Search Protect", better known as "Search Protect by conduit", can cause severe system errors upon uninstallation. It claims to protect browser settings but actually blocks all attempts to manipulate a browser through the settings page; in other words, it makes sure the malicious settings remain unchanged.