+ Post New Thread
Page 1 of 2 12 LastLast
Results 1 to 15 of 27
Wireless Networks Thread, Whats the term I'm looking for? Copper between buildings in Technical; Whats the potential problem with running copper cables between buildings causing electric shock?...
  1. #1


    Join Date
    Oct 2006
    Posts
    3,387
    Thank Post
    183
    Thanked 350 Times in 279 Posts
    Rep Power
    147

    Whats the term I'm looking for? Copper between buildings

    Whats the potential problem with running copper cables between buildings causing electric shock?

  2. #2

    localzuk's Avatar
    Join Date
    Dec 2006
    Location
    Minehead
    Posts
    17,088
    Thank Post
    511
    Thanked 2,308 Times in 1,784 Posts
    Blog Entries
    24
    Rep Power
    803
    From what I was told, its all about the difference in earth voltage between buildings. Also, if the buildings each use different phases, there is potential for issues there too.

  3. #3

    Join Date
    May 2008
    Posts
    213
    Thank Post
    2
    Thanked 27 Times in 27 Posts
    Rep Power
    17
    Think technically it may actually be 'Potential difference' but the problem is what is described above!

  4. #4
    soveryapt's Avatar
    Join Date
    Jan 2009
    Location
    Lancashire
    Posts
    2,356
    Thank Post
    617
    Thanked 274 Times in 241 Posts
    Rep Power
    77
    If you're doing a new run I'd advise looking into Fibre. Obviously gets rid of the issues you're talking about and can give you a better connection.

    Ok, it's more expensive to put in place and you may have to upgrade your switches at each end if you've not got the facility there, but it allows for better expansion. Obviously, depends on how many computers your talking about running too I guess to make sure it is effective, or if there are plans for increasing the numbers etc.

    To the question in hand though, if you're running between buildings there are always risks involved, but you can minimise these, such as by using surge protectors on the Cat5, but (and I've never really done this so I don't know for sure) often the cost of doing that can be nearly as expensive as for getting a fibre run in anyway.

    In terms of the Earth differences, it's worth getting this checked by a sparky as if its a really bad setup it could have quite a huge difference which could lead to quite high voltage differences, which again can be got round through using fibre instead (we've just had some new Portable Cabins put on site, and all the networking is done over Fibre because of these very concerns by the LEA team that arranged the install (we literally have a cabin with 1 PC in that has a fibre run all of it's own, and there isn't even room in the cabin to put in another computer realistically. It has it's own WiFi should they want to use laptops or something in there though).

  5. #5


    Join Date
    Oct 2006
    Posts
    3,387
    Thank Post
    183
    Thanked 350 Times in 279 Posts
    Rep Power
    147
    Cheers people.

    we are getting a load of huts while our school is rebuilt. Meeting today so I need to get "their" heads out of the sand and highlight every issue I can think of. I know one thing which will be suggested is "will it be cheaper to just run copper?"

  6. #6

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,713
    Thank Post
    269
    Thanked 1,115 Times in 1,011 Posts
    Rep Power
    345
    Quote Originally Posted by j17sparky View Post
    I know one thing which will be suggested is "will it be cheaper to just run copper?"
    not when they have to rebuild because on a electrical fire!

  7. #7
    soveryapt's Avatar
    Join Date
    Jan 2009
    Location
    Lancashire
    Posts
    2,356
    Thank Post
    617
    Thanked 274 Times in 241 Posts
    Rep Power
    77
    Quote Originally Posted by j17sparky View Post
    will be suggested is "will it be cheaper to just run copper?"
    To do it safely I doubt there would be much difference in the cost of copper vs fibre (when you've got the surge protection etc in place). Worth checking figures yourself on the cost of such things to see if money could be saved, or more to the point what the end cost difference would be to do it properly.

  8. #8

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,713
    Thank Post
    269
    Thanked 1,115 Times in 1,011 Posts
    Rep Power
    345
    Yep worth doing it properly - also remember that temporary buildings never tend to be very temporary - ours are still here and where put in 20 years ago!

  9. #9

    HarryMonkey's Avatar
    Join Date
    Mar 2007
    Location
    Milton Keynes
    Posts
    1,065
    Thank Post
    50
    Thanked 196 Times in 148 Posts
    Rep Power
    169
    The problem could occur when the two (or more) buildings are fed by different phases of a 3 phase supply. Should an electrical fault occur which then passes via the copper network cables, you have effectively joined 2 phases giving you 440v through the supply.

    One other selling point you could use is that if you use fibre, it can be run through the same conduit as the mains feed, whereas if you use copper it will require a conduit of its own, as it is not permitted to run mains with anything else through the same enclosure, which will clearly involve more cost.

  10. #10

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    12,959
    Thank Post
    586
    Thanked 1,493 Times in 1,339 Posts
    Rep Power
    397
    Are there any documented cases of mains voltage being fed down cat5 by faulty equipment?

    Ben

  11. #11
    Jamman960's Avatar
    Join Date
    Sep 2007
    Location
    London/Kent
    Posts
    959
    Thank Post
    173
    Thanked 191 Times in 153 Posts
    Rep Power
    45
    out of interest - If different parts of a building use different phases could that also cause a problem?

  12. #12

    nephilim's Avatar
    Join Date
    Nov 2008
    Location
    Dunstable
    Posts
    11,094
    Thank Post
    1,428
    Thanked 1,692 Times in 1,265 Posts
    Blog Entries
    2
    Rep Power
    362
    Copper will be an issue because of the different phases, even in the same building...if they wish to risk electrical fires, signal degradation and be outdated, then copper is the way to go.

    Fibre has little risk, and in the long term will be cheaper

  13. #13

    Join Date
    Apr 2010
    Posts
    1,832
    Thank Post
    62
    Thanked 161 Times in 133 Posts
    Rep Power
    64
    what happens if lightning hits the copper?

  14. #14

    HarryMonkey's Avatar
    Join Date
    Mar 2007
    Location
    Milton Keynes
    Posts
    1,065
    Thank Post
    50
    Thanked 196 Times in 148 Posts
    Rep Power
    169
    I'm sure there are cases where this may have happened. However, these are there as precautions. Would you really want to be the first docemented case simply because it hadn't happened before?

  15. #15

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    12,959
    Thank Post
    586
    Thanked 1,493 Times in 1,339 Posts
    Rep Power
    397
    Quote Originally Posted by Jamman960 View Post
    out of interest - If different parts of a building use different phases could that also cause a problem?
    Yes if you connect one cab to another using copper and the switches are powered from circuits on different phases you have the same potential issue.

    NICEIC will not allow 2 power sockets on different phases that are within reach of each other to be in existence.

    Ben

  16. Thanks to plexer from:

    Jamman960 (25th May 2011)

SHARE:
+ Post New Thread
Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 10
    Last Post: 8th December 2010, 09:27 AM
  2. Cat5e or 6 for gigabit copper network
    By meastaugh1 in forum Wireless Networks
    Replies: 51
    Last Post: 11th March 2010, 01:38 PM
  3. [Video] 3D Projection on Buildings
    By mattx in forum Jokes/Interweb Things
    Replies: 1
    Last Post: 18th December 2009, 06:10 PM
  4. Linking 2 Buildings..
    By Grommit in forum Wireless Networks
    Replies: 35
    Last Post: 13th December 2007, 08:03 PM
  5. Linking two buildings
    By adamyoung in forum Wireless Networks
    Replies: 6
    Last Post: 28th May 2006, 06:41 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •