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  2. 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 ]

  3. 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 ...

  4. 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.

  5. 3M - Wikipedia

    en.wikipedia.org/wiki/3M

    3M made $35.4 billion in total sales in 2021 and ranked number 102 in the Fortune 500 list of the largest United States corporations by total revenue. [10] As of 2021, the company had approximately 95,000 employees and operations in more than 70 countries. [11] There are a few international subsidiaries, such as 3M India, 3M Japan, and 3M Canada.

  6. Lightning rod - Wikipedia

    en.wikipedia.org/wiki/Lightning_rod

    A weak point in most lightning diversion systems is in transporting the captured discharge from the lightning rod to the ground, though. [18] Lightning rods are typically installed around the perimeter of flat roofs, or along the peaks of sloped roofs at intervals of 6.1 m or 7.6 m, depending on the height of the rod. [19]

  7. Macadam - Wikipedia

    en.wikipedia.org/wiki/Macadam

    Because of the historic use of macadam as a road surface, roads in some parts of the United States (such as parts of Pennsylvania) are referred to as macadam, even though they might be made of asphalt or concrete. Similarly, the term "tarmac" is sometimes colloquially applied to asphalt roads or aircraft runways. [22]

  8. Electrical wiring in North America - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring_in_North...

    The National Electrical Code (NEC) specifies that the black conductor represent the hot conductor, with significant voltage to earth ground; the white conductor represent the identified or neutral conductor, near ground potential; [11] and the bare/green conductor, the safety grounding conductor not normally used to carry circuit current.

  9. Grounding transformer - Wikipedia

    en.wikipedia.org/wiki/Grounding_transformer

    A grounding transformer. A grounding transformer or earthing transformer is a type of auxiliary transformer used in three-phase electric power systems to provide a ground path to either an ungrounded wye or a delta-connected system. [1] [2] Grounding transformers are part of an earthing system of the network.

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