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  2. Cross-linked polyethylene - Wikipedia

    en.wikipedia.org/wiki/Cross-linked_polyethylene

    A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.

  3. Underground power line - Wikipedia

    en.wikipedia.org/wiki/Underground_power_line

    Underground and underwater crossings may be a practical alternative to crossing rivers. For example, as of 2024, the Public Service Commission of Wisconsin determined that the installation cost of a 69-kilovolt aboveground power line is $284,000 per mile. In contrast, an equivalent underground line costs $1.5 million per mile.

  4. Pothead - Wikipedia

    en.wikipedia.org/wiki/Pothead

    A three phase electric circuit terminated with a pothead Crossarms with two three phase electric circuits terminated with potheads. A pothead is a type of insulated electrical terminal used for transitioning between overhead line and underground high-voltage cable or for connecting overhead wiring to equipment like transformers. [1]

  5. Twist-on wire connector - Wikipedia

    en.wikipedia.org/wiki/Twist-on_wire_connector

    Twist-on wire connectors are not generally recommended for use with aluminum wire in the United States. [1] The U.S. Consumer Product Safety Commission disapproves wire nuts for aluminum wire; instead, special crimp connectors are called for, and as of 2011 the CPSC asserted qualified, second-preference approval of a certain kind of screw ...

  6. Plumbing - Wikipedia

    en.wikipedia.org/wiki/Plumbing

    These sizing schemes allow for universal adaptation of transitional fittings. For instance, 1/2" PeX tubing is the same size as 1/2" copper tubing. 1/2" PVC on the other hand is not the same size as 1/2" tubing, and therefore requires either a threaded male or female adapter to connect them.

  7. Earthing system - Wikipedia

    en.wikipedia.org/wiki/Earthing_system

    Exposed-conductive-parts within a consumer installation are connected with Earth via this connection at the transformer, and thus via the supply cable(s). The conductor that connects an exposed-conductive-part of the consumer's electrical installation to Earth is called the protective earth ( PE ; see also: Ground ) conductor.

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  9. Electrical wiring in North America - Wikipedia

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

    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 with ridged, grooves or white stripes on the surface of lamp cord. NEC 2008 400.22(f) allows surface marking with ridged, grooves or white stripes on the surface of lamp cord.

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