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2. Double switching - Wikipedia

   en.wikipedia.org/wiki/Double_switching

   Double switching is a crucial safety engineering practice in railway signalling, wherein it is used to ensure that a single false feed of current to a relay is unlikely to cause a wrong-side failure. It is an example of using redundancy to increase safety and reduce the likelihood of failure, analogous to double insulation .

3. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   single pole, centre off or single pole, triple throw Similar to SPDT. Some suppliers use SPCO/SPTT for switches with a stable off position in the centre and SPDT for those without. Serial switch or two-circuit switch [citation needed] DPST (2P1T) Double pole, single throw: Double pole: Double pole: Equivalent to two SPST switches controlled by ...

4. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   These switches appear externally similar to single pole, single throw (SPST) switches, but have extra connections which allow a circuit to be controlled from multiple locations. Toggling the switch disconnects one "traveler" terminal and connects the other. Electrically, a typical "3-way" switch is a single pole, double throw (SPDT) switch. By ...

5. Trolley pole - Wikipedia

   en.wikipedia.org/wiki/Trolley_pole

   A trolley pole is not attached to the overhead wire. The pole sits atop a sprung base on the roof of the vehicle, with springs providing the pressure to keep the trolley wheel or shoe in contact with the wire. If the pole is made of wood, a cable brings the electric current down to the vehicle. A metal pole may use such a cable, or may itself ...

6. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   As an example, the 5-15R is the common 125 V two-pole, three-wire receptacle rated for 15 A. The L5-15R, while sharing the same electrical rating, is a locking design that is not physically compatible with the straight-blade 5-15 design. The 5-30R has the same two-pole, three-wire configuration and 125 V rating, but is rated for 30 A.

7. College Football Playoff format changes: What's potentially ...

   www.aol.com/sports/college-football-playoff...

   The Group of Eight. If you haven’t noticed, the SEC and Big Ten, from a resource and success standpoint, are distancing themselves from the other conferences in college athletics.

8. It's about to be 'a perfect storm' for media dealmaking

   www.aol.com/finance/perfect-storm-media-deal...

   It's about to be one of the most active dealmaking years for media and entertainment companies in recent memory. 2024 saw crimped deal volumes as interest rates remained elevated and an ...

9. China, Trump talk up prospects for US-China collaboration

   www.aol.com/news/china-trump-talk-prospects-us...

   China's top diplomat said on Tuesday he hoped the incoming Trump administration would "make the right choice" and work with Beijing, hours after Donald Trump told reporters the COVID-19 pandemic ...