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2. Ground and neutral - Wikipedia

   en.wikipedia.org/wiki/Ground_and_neutral

   The three bars for the three "live" phases (marked L1, L2 and L3) are also visible on the bottom right. In electrical engineering, ground and neutral (earth and neutral) are circuit conductors used in alternating current (AC) electrical systems. The neutral conductor returns current to the supply.

3. Electrical wiring in North America - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_North...

   Electrical switch. Earthing systems. v. t. e. Electrical wiring in North America follows the regulations and standards applicable at the installation location. It is also designed to provide proper function, and is also influenced by history and traditions of the location installation. The US National Electrical Code is applicable to many areas ...

4. Three-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Three-phase_electric_power

   Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. Three-phase electric power (abbreviated 3ϕ [1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. [2] It is a type of polyphase system employing three wires (or ...

5. Overhead power line - Wikipedia

   en.wikipedia.org/wiki/Overhead_power_line

   Shield wires on transmission lines may include optical fibers (optical ground wires/OPGW), used for communication and control of the power system. HVDC Fenno-Skan with ground wires used as electrode line. At some HVDC converter stations, the ground wire is used also as the electrode line to connect to a distant grounding electrode.

6. Optical ground wire - Wikipedia

   en.wikipedia.org/wiki/Optical_ground_wire

   An optical ground wire (also known as an OPGW or, in the IEEE standard, an optical fiber composite overhead ground wire) is a type of cable that is used in overhead power lines. Such cable combines the functions of grounding and communications. An OPGW cable contains a tubular structure with one or more optical fibers in it, surrounded by ...

7. Earthing system - Wikipedia

   en.wikipedia.org/wiki/Earthing_system

   Electrical installations. An earthing system (UK and IEC) or grounding system (US) connects specific parts of an electric power system with the ground, typically the equipments conductive surface, for safety and functional purposes. [1] The choice of earthing system can affect the safety and electromagnetic compatibility of the installation.