enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. SP-1 switch - Wikipedia

   en.wikipedia.org/wiki/SP-1_switch

   A "two wire" version for local service, a four wire version for toll service. Two/four wire versions were also available as was a TOPS variant that was used to provide Operator services. The first four wire switch (four wire-tops, i.e., it provided toll switching and operator services) was placed in service in Thunder Bay circa 1972.

3. Number One Electronic Switching System - Wikipedia

   en.wikipedia.org/wiki/Number_One_Electronic...

   Type 12A Line Grids with 2:1 LCR were only about 5 inches (12 cm) wide, with eight 4x4 Stage 0 line switches with ferrods and cutoff contacts for 32 lines, connected internally to four 4x8 Stage 1 switches connecting to B-links. Type 14A Line Grids with 4:1 LCR were about 16x12x5 inches (40x30x12 cm) with 64 lines, 32 A-links and 16 B-links.

4. British telephone socket - Wikipedia

   en.wikipedia.org/wiki/British_telephone_socket

   Plug-in extension kits are available for customers with this type of installation. The two wires from the exchange are denoted the B leg at −48 V relative to ground when the line is not in use and the A leg which is near ground potential when the line is not in use. The A leg goes to pin 5 and the B leg to pin 2 in the master socket ...

5. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   The Carter system, also known as the Chicago system, was a method of wiring three-way switches in the era of early knob-and-tube wiring. This now-obsolete wiring method has been prohibited by the USA National Electrical Code since 1923, [ 2 ] even in new knob-and-tube installations which are still permitted under certain circumstances.

6. Punch down tool - Wikipedia

   en.wikipedia.org/wiki/Punch_down_tool

   A punch down tool, punchdown tool, IDC tool, or a Krone tool (named after the Krone LSA-PLUS connector), is a small hand tool used by telecommunication and network technicians. It is used for inserting wire into insulation-displacement connectors on punch down blocks , patch panels , keystone modules , and surface mount boxes (also known as ...

7. Network protector - Wikipedia

   en.wikipedia.org/wiki/Network_protector

   A network protector is a type of electric protective device used in electricity distribution systems. The network protector automatically disconnect its associated distribution transformer from the secondary network when the power starts flowing in reverse direction. Network protectors are used on both spot networks and grid networks. The ...

8. Residual-current device - Wikipedia

   en.wikipedia.org/wiki/Residual-current_device

   A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...

9. FASTON terminal - Wikipedia

   en.wikipedia.org/wiki/FASTON_terminal

   The terminal system consists of tabs (male) and receptacles (female). There are free-hanging wire and circuit board mounted versions of both tabs and receptacles. All widths come mostly in one of two tab thicknesses: 0.032 and 0.020 in (0.8 and 0.5 mm). A hand tool exists for inserting the terminals: the AMP Universal Handle. [citation needed]