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Wireless Networks Thread, Installing underground Cat5e cable in Technical; Run 2 x Cat5E cables, And 3-4 pieces of sturdy string/wire as well, so if you ever do get Optics ...
  1. #16
    ahuxham's Avatar
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    Run 2 x Cat5E cables,
    And 3-4 pieces of sturdy string/wire as well, so if you ever do get Optics in there, or need anything else, you can just pull it through,

  2. #17

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    Fibre all the way. Your sparks WILL be concerned about a copper connection between buildings, or rather they should be...

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    Geoff's Avatar
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    Also be aware that electrically connecting two buildings like that may be a breach of your local building codes.

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    I agree with what others have said - stick some fibre in and be done. It's the right way to do the job.

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    In my last job, a school had a cat5 cable suspended between two buildings, naked to the elements. As far as I'm aware, it's been working without issue for quite a few years.

    Don't worry too much about insulating the cables using armoured CAT5. There's a reason why the wires are twisted

  6. #21

    localzuk's Avatar
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    Quote Originally Posted by fafster View Post
    In my last job, a school had a cat5 cable suspended between two buildings, naked to the elements. As far as I'm aware, it's been working without issue for quite a few years.

    Don't worry too much about insulating the cables using armoured CAT5. There's a reason why the wires are twisted
    That is terrible advice! The twisted nature of the cable is there to prevent crosstalk between the individual wires inside the cable. *Not* to protect against external interference!

    Also, running a cable between 2 buildings, naked to the elements, is simply dangerous. If it is not grounded etc... then it is a lightning strike risk and as such you could lose equipment due to it, or even cause serious injury to someone should they be touching the equipment at the time!

  7. #22

    Geoff's Avatar
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    then it is a lightning strike risk and as such you could lose equipment due to it, or even cause serious injury to someone should they be touching the equipment at the time!
    This risk also exists with buried cable unless it is deeper than 18 inches/3 feet.

  8. #23

    localzuk's Avatar
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    Quote Originally Posted by Geoff View Post
    This risk also exists with buried cable unless it is deeper than 18 inches/3 feet.
    which is it? 18 inches or 3 feet? :P

  9. #24

    Geoff's Avatar
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    Quote Originally Posted by localzuk View Post
    which is it? 18 inches or 3 feet? :P
    Yes.

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    underground

    We have done this in a few buildings
    we put in a 4" drain pipe with Cat5 E cable , Fibre and most importantly a draw rope to pull in more cables. One important thing is Fire regulations we had a fall out with fire officer on this as cable entry points are a possible route for fire to enterr bulidings. We used low smoke cable but each end of the pipe had to have a fire proof gromit fitted. Fibre is now cheaper than copper wire as price off copper gone through the roof recently.

  11. #26


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    This job definitely requires armored fiber.
    Don't try and bodge it with copper cable - it isn't designed for it.
    We once 'bodged' an interconnect using standard internal fiber optics - within a month rats had gotten into the trench tunnels and shredded the fire to pieces. We then had to re-do the job with armored fiber. Sometimes the 'simple' route isn't the simplest or the cheapest.

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    Quote Originally Posted by localzuk View Post
    That is terrible advice! The twisted nature of the cable is there to prevent crosstalk between the individual wires inside the cable. *Not* to protect against external interference!
    The properties of the twisting also guard against a surprising level of outside interference. Granted, I'm not saying that running UTP outside is a good idea, just that it's possible.

  13. #28

    Andrew_C's Avatar
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    Twisting is DESIGNED as a common mode rejection strategy. In this context it matters not a darn. The right way is fibre, the wrong way is copper.

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    I know this is not ideal and would like to change it but we have a handful of buildings connected with external grade cat5 suspended to the eliments and have been for 8 years now with not issues.

    Although if doing it again i'd do with the fibre or Cat6.

  15. #30


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    Quote Originally Posted by Geoff View Post
    Yes.
    lol

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