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  2. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    The best example is Flanges, there are multiple holes in the Flanges, the circle through the center of these holes is known as the pitch circle, and the diameter of this circle is known as Pitch Circle Diameter, in short PCD. PDM, PDMS: product data management, product data manager [app], product data management system [app]

  3. Wetting current - Wikipedia

    en.wikipedia.org/wiki/Wetting_current

    Providing a sufficient amount of wetting current is a crucial step in designing systems that use delicate switches with small contact pressure as sensor inputs. Failing to do this might result in switches remaining electrically "open" when pressed, due to contact oxidation. [4] [5]

  4. Electrical wiring - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring

    Installing electrical wiring by "chasing" grooves into the masonry structure of the walls of a building. Materials for wiring interior electrical systems in buildings vary depending on: Intended use and amount of power demand on the circuit; Type of occupancy and size of the building; National and local regulations

  5. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.

  6. Will California homeowners relocate or rebuild? Both are costly

    www.aol.com/california-homeowners-relocate...

    Tens of thousands of California residents will be forced to decide whether to permanently relocate or face construction bills after a wildfire crisis that’s weakened California’s insurance.

  7. Printed circuit board - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board

    Through-hole (leaded) resistors Through-hole devices mounted on the circuit board of a mid-1980s Commodore 64 home computer A box of drill bits used for making holes in printed circuit boards. While tungsten-carbide bits are very hard, they eventually wear out or break. Drilling is a considerable part of the cost of a through-hole printed ...

  8. Here’s the last day to send your gifts in time for the holidays

    www.aol.com/last-day-send-gifts-time-143042135.html

    The National Retail Federation confirmed this month that holiday spending could increase by as much as 3.5% from last year and hit a new record of $989 billion.

  9. A Washington, D.C. man has been arrested for threatening flight attendants on a United Airlines plane traveling from Houston to New Jersey. Kedus Yacob Damtew, 38, was charged with one count of ...