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  2. Ladder logic - Wikipedia

    en.wikipedia.org/wiki/Ladder_logic

    Ladder notation is best suited to control problems where only binary variables are required and where interlocking and sequencing of binary is the primary control problem. Like all parallel programming languages , the sequential order of operations may be undefined or obscure; logic race conditions are possible which may produce unexpected results.

  3. Shelf (storage) - Wikipedia

    en.wikipedia.org/wiki/Shelf_(storage)

    When hanging shelves on a wall, home designers generally try to ensure that the shelf should be no wider than 1.4 x bracket's width and no wider than 1.2 x bracket's height. [citation needed] Spacing brackets for a long shelf should be no more than 4 x shelf-breadth between each bracket - this holds true for normal materials used at home. [9]

  4. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    As 535 mm is very close to 21 inches, these racks are sometimes called 21-inch racks. The gap between the posts is 500 millimetres (19.69 in). As 19-inch equipment has a maximum width of 17 + 1 ⁄ 4 inches (438.15 mm), they can easily be mounted in an ETSI rack by means of an ETSI bracket or adapter plate.

  5. Wire shelving - Wikipedia

    en.wikipedia.org/wiki/Wire_shelving

    Wire decking consists of wire mesh supported by metal supports and is intended to be load-bearing. The mesh is usually welded to the supports, but may be attached in other ways as well. In commercial and industrial applications, the wire mesh usually has a minimum wire gauge of 0.105 inches when round wire is used. The most common shelf size is ...

  6. Cable tray - Wikipedia

    en.wikipedia.org/wiki/Cable_tray

    In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction.

  7. Main distribution frame - Wikipedia

    en.wikipedia.org/wiki/Main_distribution_frame

    Small, single-sided MDF for a military base, 1940s Modern main distribution frame MDF at a central office with capacity for 67,000 users. In telephony, a main distribution frame (MDF or main frame) is a signal distribution frame for connecting equipment (inside plant) to cables and subscriber carrier equipment (outside plant).

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