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  2. Electrical conduit - Wikipedia

    en.wikipedia.org/wiki/Electrical_conduit

    EMT is available in trade sizes 1/2" through 4", and 10′ and 20′ lengths. Some manufacturers also produce EMT in a range of colors for easy system identification. Aluminum conduit , similar to galvanized steel conduit, is a rigid tube, generally used in commercial and industrial applications where a higher resistance to corrosion is needed.

  3. National Electrical Code - Wikipedia

    en.wikipedia.org/wiki/National_Electrical_Code

    The NEC specifies acceptable numbers of conductors in crowded areas such as inside conduit, referred to as the fill rating. If the accepted fill rating is exceeded, then all the cables in the conduit are derated, lowering their acceptable maximum ambient operating temperature. Derating is necessary because multiple conductors carrying full-load ...

  4. Overhead line - Wikipedia

    en.wikipedia.org/wiki/Overhead_line

    The catenary wire is made of copper or copper alloys of 70, 120 or 150 mm 2. The smaller cross sections are made of 19 strands, whereas the bigger has 37 strands. Two standard configurations for main lines consist of two contact wires of 100 mm 2 and one or two catenary wires of 120 mm 2, totaling 320 or 440 mm 2. Only one contact wire is often ...

  5. Coupling (piping) - Wikipedia

    en.wikipedia.org/wiki/Coupling_(piping)

    Pipe coupling (copper sweat) In piping and plumbing, a coupling (or coupler) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (), brazed or soldered (copper, brass etc.) together.

  6. Immigration advocates gear up to fight Trump promises in ...

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    The cozy slippers that are 'just like UGGs but at a great price' are down to $24. AOL. 25 hostess gifts from Walmart are way better than a bottle of wine. See all deals. In Other News.

  7. November retail sales top Wall Street's expectations

    www.aol.com/finance/november-retail-sales-top...

    A 2.4% month-over-month increase in motor vehicle and auto parts sales, as well as a 1.8% increase in online sales, drove the gains. November sales, excluding auto and gas, rose 0.2%, below ...

  8. Ukraine says it has laser weapon able to down targets flying ...

    www.aol.com/news/ukraine-says-laser-weapon-able...

    (Reuters) - Ukraine possesses a laser weapon capable of shooting down airborne targets at an altitude of more than 2 kilometres (1.2 miles), the country's drone forces commander said on Monday.

  9. Cast iron pipe - Wikipedia

    en.wikipedia.org/wiki/Cast_iron_pipe

    1.68 (42.672) 47.84 (1,215.136) BS 78 was finally superseded when the UK harmonised with incompatible European standards, however, the specified outer dimensions continue to remain in effect (albeit in metric form) as the standard pipe outer diameter for ductile iron pipe in Australia and New Zealand through the descendant specification, AS ...

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