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  2. Grounding resistance tester - Wikipedia

    en.wikipedia.org/wiki/Grounding_resistance_tester

    A grounding resistance tester also called an earth tester is a soil resistance measuring instrument. It is used for sizing and projecting grounding grids. [1]Digital Earth resistance tester Analog Grounding resistance tester schematic Graph of Comparison analog and digital grounding resistance testers

  3. Groundbed - Wikipedia

    en.wikipedia.org/wiki/Groundbed

    The electrodes for electrical grounding are often called ground rods and are often made from steel with a copper clad surface – typically 1 to 2 m long and 20 millimetres (0.79 in) in diameter. These are driven vertically into the ground and bonded together with bare copper wire. [1]

  4. Isolated ground - Wikipedia

    en.wikipedia.org/wiki/Isolated_ground

    An isolated ground (IG) (or Functional Earth (FE) in European literature) is a ground connection to a local earth electrode from equipment where the main supply uses a different earthing arrangement, one of the common earthing arrangements used with domestic mains supplies.

  5. Earthing system - Wikipedia

    en.wikipedia.org/wiki/Earthing_system

    While the national wiring regulations for buildings of many countries follow the IEC 60364 terminology, in North America (United States and Canada), the term "equipment grounding conductor" refers to equipment grounds and ground wires on branch circuits, and "grounding electrode conductor" is used for conductors bonding an earth/ground rod ...

  6. Ufer ground - Wikipedia

    en.wikipedia.org/wiki/Ufer_Ground

    The extremely dry soil conditions would have required hundreds of feet of rods to be driven into the earth to create a low impedance ground to protect the buildings from lightning strikes. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. Ufer was given the task of finding a lower cost and more practical alternative to ...

  7. California land to be returned to Yurok Tribe - AOL

    www.aol.com/california-land-returned-yurok-tribe...

    Rosie Clayburn is a descendant of the Yurok Tribe, which had its territory — called 'O Rew in the Yurok language — ripped from them nearly two centuries ago. "As the natural world became ...

  8. Ring ground - Wikipedia

    en.wikipedia.org/wiki/Ring_ground

    A halo ground is a type of ring ground that, instead of being installed outside and underground, is installed inside, near the top of a building or structure. The ground reference for all equipment inside the area being protected is separate from the halo.

  9. How New Orleans' security measures failed to prevent a ... - AOL

    www.aol.com/news/vehicle-attacks-difficult...

    Options include permanent concrete blocks, metal bollards that can retract to let emergency vehicles through, temporary metal barricades, police vehicles, and trucks filled with sand.

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