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Cattle deaths

lyledunn
Some 10 prize bullocks died in quick succession whilst housed over winter in a cattle shed. The government vet was unable to reach a conclusion on cause but apparently does not discount electric shock as an indirect cause. 

The shed comprises steel columns and trusses with corrugated iron sheeting over. The floor comprises re-Inforced concrete slats over the slurry tank. The pens have steel barriers supported by steel posts all of which are heavily corroded but still making contact with other albeit fortuitously.

The earthing system is TT with the shed steelwork on its own providing a substantially low impedance of 5 ohms using a loop tester. A 100mA RCD protects the rather ropey lighting circuits.defccf32df3c757507a0db6ad0a35f87-huge-a5af3537-8eae-4a3c-9126-68fa60b61ac7.jpg

whilst the floor could be wet, I can’t conceive how a voltage difference could be established even if the steelwork was at 230v

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    Sparkingchip:

    This feels like a teaching my grandmother to suck eggs conversation.


    Do the farm buildings share an earth connection through a pipe or cable with the farmhouse or another installation that is TN earthed with circuits that are not RCD protected?


    Do the farm buildings share an earth connection through a pipe or cable with the farmhouse or another installation that is TT earthed with circuits that are RCD protected, but one of those RCDs is faulty rather than the 100 mA RCD that is upfront of the farm buildings installation?


    Andy Betteridge.


     






    Andy, yes, all those issues checked. Mike, no other equipment other than a couple of corroded light fittings. 

    Would anyone care to speculate whether a voltage gradient could be established across the slatted re-enforced concrete floor? Suppose the RCD was indeed faulty and current was limited only by the impedance of the steel frame to earth which was circa 5ohms.

     

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  • 0

    Sparkingchip:

    This feels like a teaching my grandmother to suck eggs conversation.


    Do the farm buildings share an earth connection through a pipe or cable with the farmhouse or another installation that is TN earthed with circuits that are not RCD protected?


    Do the farm buildings share an earth connection through a pipe or cable with the farmhouse or another installation that is TT earthed with circuits that are RCD protected, but one of those RCDs is faulty rather than the 100 mA RCD that is upfront of the farm buildings installation?


    Andy Betteridge.


     






    Andy, yes, all those issues checked. Mike, no other equipment other than a couple of corroded light fittings. 

    Would anyone care to speculate whether a voltage gradient could be established across the slatted re-enforced concrete floor? Suppose the RCD was indeed faulty and current was limited only by the impedance of the steel frame to earth which was circa 5ohms.

     

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