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  2. Underground power line - Wikipedia

    en.wikipedia.org/wiki/Underground_power_line

    Underground cables need a narrower surrounding strip of about 1–10 meters to install (up to 30 m for 400 kV cables during construction), whereas an overhead line requires a surrounding strip of about 20–200 meters wide to be kept permanently clear for safety, maintenance and repair. Underground cables pose no hazard to low-flying aircraft ...

  3. The Underground Railroad (miniseries) - Wikipedia

    en.wikipedia.org/wiki/The_Underground_Railroad...

    The Underground Railroad is an American historical drama limited television series created and directed by Barry Jenkins based on the 2016 novel of the same name by Colson Whitehead. The series premiered on Amazon Prime Video on May 14, 2021.

  4. Electrical conduit - Wikipedia

    en.wikipedia.org/wiki/Electrical_conduit

    Box connectors join conduit to a junction box or other electrical box. A typical box connector is inserted into a knockout in a junction box, with the threaded end then being secured with a ring (called a lock nut ) from within the box, as a bolt would be secured by a nut.

  5. Fire screen - Wikipedia

    en.wikipedia.org/wiki/Fire_screen

    The three-panel fire screen, which covers the fireplace almost completely, has two side panels angled away from the central panel. It is an effective way of providing decoration in a room. The horse screen, or cheval screen (cheval is the French word for horse) was in common use from the 18th century. It is a wide screen having two feet on each ...

  6. Optimum HDTV viewing distance - Wikipedia

    en.wikipedia.org/wiki/Optimum_HDTV_viewing_distance

    0.8 H. This table can be used in a number of ways : Find the optimal distance for a given screen. Example: for a 4K UHD screen 140 cm high (112 inches diagonal), the optimal distance is 140 × 1.6 = 224 cm. Find the right screen size. Example: for a 1080 HDTV used at a distance of 250 cm, you need to find a screen whose height is close to ...

  7. Signalling control - Wikipedia

    en.wikipedia.org/wiki/Signalling_control

    On a rail transport system, signalling control is the process by which control is exercised over train movements by way of railway signals and block systems to ensure that trains operate safely, over the correct route and to the proper timetable. Signalling control was originally exercised via a decentralised network of control points that were ...

  8. Station box - Wikipedia

    en.wikipedia.org/wiki/Station_box

    A station box is a term in the construction industry: It describes a box-like underground structure for a transportation system, for example a metro or tube station. [1] Station boxes are built in two methods – "top-down" or "bottom-up". In the "bottom-up" method, a chamber as large as the station structure is dug into the ground into which ...

  9. Fire alarm call box - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_call_box

    Fire alarm call box. A fire alarm box, fire alarm call box, or fire alarm pull box is a device used for notifying a fire department of a fire or a fire alarm activation. Typically installed on street corners or on the outside of commercial buildings in urban areas, they were the main means of summoning firefighters before the general ...

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