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  2. Directional boring - Wikipedia

    en.wikipedia.org/wiki/Directional_boring

    Directional boring machine. Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig.

  3. Underground power line - Wikipedia

    en.wikipedia.org/wiki/Underground_power_line

    However, depending on the depth of the underground cable; greater EMF may be experienced on the surface. [4] The electric current in the cable conductor produces a magnetic field, but the closer grouping of underground power cables reduces the resultant external magnetic field, and further magnetic shielding may be provided.

  4. Through-the-earth mine communications - Wikipedia

    en.wikipedia.org/wiki/Through-the-earth_mine...

    Through-the-Earth transmission can overcome these restrictions by using ultra-low frequency (300–3000 Hz) signals, which can travel through several hundred feet of rock strata. The antenna cable can be located on the surface only at a mine site, and provide signal coverage to the mine.

  5. Electrical wiring in North America - Wikipedia

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

    In both those instances the white wire should be identified as being hot, usually with black tape inside junction boxes. The neutral wire is identified by gray or white insulated wire, perhaps using stripes or markings. With lamp cord wire the ribbed wire is the neutral, and the smooth wire is the hot. NEC 2008 400.22(f) allows surface marking ...

  6. College Football Playoff: Who has best, worst path to ...

    www.aol.com/college-football-playoff-best-worst...

    CFP: Nick Saban shares thoughts on bracket: 'My question about all the strength of schedule' College Football Playoff bracket: Easiest path to national championship 1) Georgia The team with the ...

  7. Man arrested in 1985 murder of couple at a Georgia church ...

    www.aol.com/man-arrested-1985-murder-couple...

    A Georgia man was arrested Monday in the 1985 murder of two people at a church, after the original suspect spent two decades in prison.

  8. Texas has spent millions placing razor wire along the border ...

    www.aol.com/texas-spent-millions-placing-razor...

    You're adding hundreds of miles to that smuggling journey." While effective, razor wire is not without drawbacks. More than a traditional border wall, wire needs to be constantly monitored. It ...

  9. Underground pneumatic boring - Wikipedia

    en.wikipedia.org/wiki/Underground_pneumatic_boring

    Underground pneumatic drills can be used in the installation of public utilities like power lines, gas lines, phone cables, and cable television. It can also be used to install residential lawn irrigation systems. Boring is especially useful when it is difficult or cost-prohibitive to plow or trench. Underground pneumatic boring can be a low ...

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