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2. Ground and neutral - Wikipedia

   en.wikipedia.org/wiki/Ground_and_neutral

   We also see the thick wires in standard colors (two yellow/green ground and two blue neutral), as well as markings PEN (protected earth and neutral), PE (protective earth) and N (neutral). The three bars for the three "live" phases (marked L1, L2 and L3) are also visible on the bottom right.

3. Electrical wiring in North America - Wikipedia

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

   For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three-phase systems. Black, Red and Blue are used for hot wires and White is used as the neutral wire in a 120/208 V circuit. Brown, Orange and Yellow are used as hot wires and gray is used as the neutral wire in a 277/ ...

4. Overhead wire marker - Wikipedia

   en.wikipedia.org/wiki/Overhead_wire_marker

   Markers are often installed on overhead lines near airfields, or at river crossings where there is a possibility of float-equipped aircraft using the river. Some markers contain conductor marking lights or strobe lights to improve visibility at night or in fog. An overhead line obstruction warning marker near an airstrip.

5. Overhead power line - Wikipedia

   en.wikipedia.org/wiki/Overhead_power_line

   A grounded wire is sometimes strung along the tops of the towers to provide lightning protection. An optical ground wire is a more advanced version with embedded optical fibers for communication. Overhead wire markers can be mounted on the ground wire to meet International Civil Aviation Organization recommendations. [6]

6. Underground power line - Wikipedia

   en.wikipedia.org/wiki/Underground_power_line

   An underground cable marker. Markers are put at regular intervals to show the route and warn of the hazard of digging into the cable. Undergrounding is more expensive, since the cost of burying cables at transmission voltages is several times greater than overhead power lines, and the life-cycle cost of an underground power cable is two to four ...

7. Overhead line - Wikipedia

   en.wikipedia.org/wiki/Overhead_line

   The wire is not round but has grooves at the sides to allow the hangers to attach to it. Sizes were (in cross-sectional area) 85, 100, or 150 mm 2. To make the wire stronger, 0.04% tin might be added. The wire must resist the heat generated by arcing and thus such wires should never be spliced by thermal means.

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   mail.aol.com/?offerId=netscapeconnect-en-us

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9. IEC 60446 - Wikipedia

   en.wikipedia.org/wiki/IEC_60446

   The international standard IEC 60446 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors was a standard published by the International Electrotechnical Commission (IEC) that defined basic safety principles for identifying electrical conductors by colours or numerals, for example in ...