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Detecting cut cable

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  • 04-04-2021 11:18am
    #1
    alan4cult
    Registered Users Posts: 1,583 ✭✭✭


    Is there any device that will detect a cable cut, similar to a device in an alarm circuit.

    Example: if I cut an outdoor cable, I will probably trigger the RCD but it's not guaranteed that it will. I'm looking for a device that would detect that current is not travelling to the other end. Does such a device exist that would then disconnect the power?


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    #2
    Henry.
    Closed Accounts Posts: 26 ✭Henry.


    alan4cult wrote: »
    Is there any device that will detect a cable cut, similar to a device in an alarm circuit.

    Example: if I cut an outdoor cable, I will probably trigger the RCD but it's not guaranteed that it will. I'm looking for a device that would detect that current is not travelling to the other end. Does such a device exist that would then disconnect the power?
    When you say current, how much ?


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    #3
    punisher5112
    Registered Users Posts: 24,647 ✭✭✭✭punisher5112


    Cut off power so if it's still live you don't get a bang off it.....

    There are cable finders for buried cables, I actually have 2 industrial ones but well out of date on commission.

    Were you digging?


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    #4
    Henry.
    Closed Accounts Posts: 26 ✭Henry.


    Of the top of my head ,the 2 basic ways im familiar with is

    Monitoring at the origin using current sensing, that requires a connected load

    Monitoring at the remote end, that requires a separate pair to monitor the voltage (?) at the remote end

    You can probably do the latter monitoring wirelessly

    Probably other methods available


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    #5
    alan4cult
    Registered Users Posts: 1,583 ✭✭✭alan4cult


    punisher5112 wrote: »
    Cut off power so if it's still live you don't get a bang off it.....

    There are cable finders for buried cables, I actually have 2 industrial ones but well out of date on commission.

    Were you digging?
    No no I'm not digging, I'm more curious if such a device exists. SWA should trigger an RCD due to either a neutral/earth fault or a line/earth or line/netural but it also may not. If it's a perfect cut with a non metallic object


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    #6
    brightspark
    Registered Users Posts: 2,637 ✭✭✭brightspark


    Something like this, though it would be dependant on a reasonably constant load.
    (often used to detect failure of heating circuits)

    https://ie.rs-online.com/web/p/monitoring-relays/8577075/?cm_mmc=IE-PLA-DS3A-_-google-_-CSS_IE_EN_Relays_Whoop_HI-_-(IE:Whoop!)+Monitoring+Relays-_-8577075&matchtype=&pla-356934343345&gclid=CjwKCAjwx6WDBhBQEiwA_dP8rfokc0hm1pWhswEvAMe2wITdcaQoc9n4suk0dRX6jKK-0pLvpD1hExoC1b0QAvD_BwE&gclsrc=aw.ds


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