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2. Copper - Wikipedia

   en.wikipedia.org/wiki/Copper

   The environmental cost of copper mining was estimated at 3.7 kg ... [122] [123] Copper wire is used in ... 100% of the Daily Value was 2.0 mg, but as of ...

3. Copper conductor - Wikipedia

   en.wikipedia.org/wiki/Copper_conductor

   Copper is the electrical conductor in many categories of electrical wiring. [ 3][ 4] Copper wire is used in power generation, power transmission, power distribution, telecommunications, electronics circuitry, and countless types of electrical equipment. [ 5] Copper and its alloys are also used to make electrical contacts.

4. Underground power line - Wikipedia

   en.wikipedia.org/wiki/Underground_power_line

   Above-ground lines cost around $10 per 1-foot (0.30 m) and underground lines cost in the range of $20 to $40 per 1-foot (0.30 m). [9] In highly urbanized areas, the cost of underground transmission can be 10–14 times as expensive as overhead. [10] However, these calculations may neglect the cost of power interruptions.

5. Electrical wiring - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring

   Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in a structure. Wiring is subject to safety standards for design and installation. Allowable wire and cable types and sizes are specified according to the circuit operating voltage and electric ...

6. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   The conduit methods were known to be of better quality, but cost significantly more than K&T. [2] In 1909, flexible armored cable cost about twice as much as K&T, and conduit cost about three times the price of K&T. [5] Knob and tube wiring persisted since it allowed owners to wire a building for electricity at lower cost.

7. Oxygen-free copper - Wikipedia

   en.wikipedia.org/wiki/Oxygen-free_copper

   Oxygen-free copper ( OFC) or oxygen-free high thermal conductivity ( OFHC) copper is a group of wrought high-conductivity copper alloys that have been electrolytically refined to reduce the level of oxygen to 0.001% or below. [ 1][ 2] Oxygen-free copper is a premium grade of copper that has a high level of conductivity and is virtually free ...