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  2. Computer case screws - Wikipedia

    en.wikipedia.org/wiki/Computer_case_screws

    The #6-32 UNC screw has a thread pitch of 1/32 in (0.031250 inches (0.7938 mm)).. The #6-32 UNC is a UTS screw specifying a major thread diameter of #6 which is defined as 0.1380 inches (3.51 mm); and 32 tpi (threads per inch) which equates to a thread pitch of 0.031250 inches (0.7938 mm).

  3. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    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. In contrast to the 19-inch standards, ETSI also defined the size of the rack enclosure: the four allowed widths are 150, 300, 600, 900 millimetres (5.9, 11.8, 23.6, 35.4 in) and ...

  4. M.2 - Wikipedia

    en.wikipedia.org/wiki/M.2

    A size comparison of an mSATA SSD (left) and an M.2 2242 SSD (right) M.2, pronounced m dot two [1] and formerly known as the Next Generation Form Factor (NGFF), is a specification for internally mounted computer expansion cards and associated connectors.

  5. NVM Express - Wikipedia

    en.wikipedia.org/wiki/NVM_Express

    Historically, most SSDs used buses such as SATA, SAS, or Fibre Channel for interfacing with the rest of a computer system. Since SSDs became available in mass markets, SATA has become the most typical way for connecting SSDs in personal computers; however, SATA was designed primarily for interfacing with mechanical hard disk drives (HDDs), and it became increasingly inadequate for SSDs, which ...

  6. Hitachi Rail Italy Driverless Metro - Wikipedia

    en.wikipedia.org/wiki/Hitachi_Rail_Italy...

    The Hitachi Rail Italy Driverless Metro is a class of driverless electric multiple units and corresponding signaling system. Manufactured by Hitachi Rail Italy (formerly AnsaldoBreda) and Hitachi Rail STS (former name Ansaldo STS) in Italy, it is or will be used on the Copenhagen Metro, a people mover at Princess Nourah Bint Abdul Rahman University, the Brescia Metro, the Thessaloniki Metro ...

  7. List of driverless train systems - Wikipedia

    en.wikipedia.org/wiki/List_of_driverless_train...

    AnsaldoBreda Driverless Metro / Ansaldo STS DTG [11] Line M2: Line M3: 29 September 2019: AnsaldoBreda Driverless Metro / Ansaldo STS CBTC Line M4: 28 March 2020: France: CDGVAL: Line 1: 3 April 2007: VAL system: Line 2: 27 June 2007: Lille Metro: Line A: 25 April 1983: VAL system: First line to use the VAL system Line B: 1 April 1989: Lyon ...

  8. NEMA enclosure types - Wikipedia

    en.wikipedia.org/wiki/NEMA_enclosure_types

    Below is a list of NEMA enclosure types; these types are further defined in NEMA 250- Enclosures for Electrical Equipment. Each type specifies characteristics of an enclosure, but not, for example, a specific enclosure size. Note that higher numbers do not include the lower-numbered tests. For example, types 3, 4 and 6 are intended for outdoor ...

  9. Electrical wiring - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring

    Each phase of the circuit is run in a separate grounded metal enclosure. The only fault possible is a phase-to-ground fault, since the enclosures are separated. This type of bus can be rated up to 50,000 amperes and up to hundreds of kilovolts (during normal service, not just for faults), but is not used for building wiring in the conventional ...