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2. Overhead power line - Wikipedia

   en.wikipedia.org/wiki/Overhead_power_line

   Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains. Overhead line is designed on the principle of one or more overhead wires situated over rail tracks. Feeder stations at regular intervals along the overhead line supply power from the high-voltage grid.

3. Underground power line - Wikipedia

   en.wikipedia.org/wiki/Underground_power_line

   An underground power line provides electrical power with underground cables. Compared to overhead power lines, underground lines have lower risk of starting a wildfire and reduce the risk of the electrical supply being interrupted by outages during high winds, thunderstorms or heavy snow or ice storms. An added benefit of undergrounding is the ...

4. Electrical grid - Wikipedia

   en.wikipedia.org/wiki/Electrical_grid

   The frequency was standardised at 50 Hz, and the 225 kV network replaced 110 kV and 120 kV. Since 1956, service voltage has been standardised at 220/380 V, replacing the previous 127/220 V. During the 1970s, the 400 kV network, the new European standard, was implemented.

5. Copper tubing - Wikipedia

   en.wikipedia.org/wiki/Copper_tubing

   Rigid copper is a popular choice for water lines. Rigid or "Hard" copper tubing is generally referred to as "pipe". Copper "piping" is referred to by nominal pipe size, or the inner diameter. It is joined using a solder/sweat, roll grooved, compression, or crimped/pressed connection.

6. AT&T to eliminate copper wire phone lines to most users. Who ...

   www.aol.com/t-eliminate-copper-wire-phone...

   "But if you're going to replace the old network, you have to make sure the new network will work when people need it the most and that it is reliable, that it doesn't die in a power outage," Costa ...

7. Commutator (electric) - Wikipedia

   en.wikipedia.org/wiki/Commutator_(electric)

   On large industrial machines (say, from several kilowatts to thousands of kilowatts in rating) it is economical to replace individual damaged segments, and so the end-wedge can be unscrewed and individual segments removed and replaced. Replacing the copper and mica segments is commonly referred to as "refilling".