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Safe Disconnection to Undertake Work.

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Scene. An old farm building now used as a double glazing frame maker's workshop.


The supply comes from an old shed about 40 metres away, where the meter is. The old shed has some 70s/80s rusty M.E.M. isolators that feed several S.W.A. cables that exist the shed in many directions underground. I suspect that one feeds the main farmhouse, another a rented cottage and the others various farm buildings. There is no clear labelling of the isolators.


What is the best way to locate the frame maker's  building supply where I have to work?


Somewhere I have a circuit i/d set, if I can find it, but that will need access to the live parts and I do not wish to turn off the wrong isolator.


Z.


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    Humm, what about a transformer generating a small current connected between your chosen building's earth terminal and a temporary electrode - the circuit should then be completed by the supplier's electrodes and the supply PEs - so should be flowing (unbalanced) in the SWA to that building, A clamp meter around the entire cable should then be able to detect your test current.


    (non-conducting helmet on)


        - Andy.
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  • 0
    Humm, what about a transformer generating a small current connected between your chosen building's earth terminal and a temporary electrode - the circuit should then be completed by the supplier's electrodes and the supply PEs - so should be flowing (unbalanced) in the SWA to that building, A clamp meter around the entire cable should then be able to detect your test current.


    (non-conducting helmet on)


        - Andy.
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