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Testing Phone Wires

  • 15-08-2014 11:12am
    #1
    jmgall
    Registered Users Posts: 15 ✭


    Hi All,
    I have all my phone wires (Cat 5) running to a panel in my home office. Its a new house and I'm getting the phone line installed shortly.
    I need to test the wires to figure out which one is running outside to the Eircom box on the wall, I know I should have marked this in some way earlier but anyway !,

    I was thinking of hooking an old car battery to the wire outside and checking the other ends inside with a multimeter. The battery I have is almost flat so shouldn't be putting out the full 12V.

    Would this be safe enough to do ?
    Would I just hook the positave and negative to any of the cat 5 wires and check for voltage in the corrisponding coloured wires in each of the lines in the office ?
    Any other suggestions would be appricated.

    Thanks
    J
    Tagged:


Comments

  • #2
    Alun
    Registered Users Posts: 21,412 ✭✭✭✭Alun


    No need for a battery. Just strip and twist two wires of one pair on one end together and use the continuity tester or resistance measurement on your multimeter to test which one it is.


  • #3
    jmgall
    Registered Users Posts: 15 ✭jmgall


    Thanks Alun,
    So for example, twist the thick blue/white and thick white/blue (1 pair) together and same on the other ends and test which one has continuinity ??

    I'll give that a go.


  • #4
    ED E
    Registered Users Posts: 36,162 ✭✭✭✭ED E


    The technician installing it can use a toner to find the pair if needed.


  • #5
    Alun
    Registered Users Posts: 21,412 ✭✭✭✭Alun


    jmgall wrote: »
    Thanks Alun,
    So for example, twist the thick blue/white and thick white/blue (1 pair) together and same on the other ends and test which one has continuinity ??

    I'll give that a go.
    Yes, that's it.


  • #6
    same ol sh1te
    Closed Accounts Posts: 1,837 ✭✭✭same ol sh1te


    jmgall wrote: »
    Thanks Alun,
    So for example, twist the thick blue/white and thick white/blue (1 pair) together and same on the other ends and test which one has continuinity ??

    I'll give that a go.

    No, don't join the pairs at both ends, that serves no purpose. Twist the pair together outside and then test continuity by connecting your meter to each strand of the pair inside.


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  • #7
    Alun
    Registered Users Posts: 21,412 ✭✭✭✭Alun


    same ol sh1te wrote: »
    No, don't join the pairs at both ends, that serves no purpose. Twist the pair together outside and then test continuity by connecting your meter to each strand of the pair inside.
    Doh, I didn't read his reply properly :D

    No, don't do both ends, just the one!


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