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Safe Disconnection to Undertake Work.

Zoomup
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.


Parents
  • 0
    Job done. Hooray. Thanks for the advice all. I noted Mike's suggestion ref. S.W.A. sizes and markings. I could not see any markings but I measured the cables o/d  sizes. That left me with three possibilities in the meter shed, but no cable there had an external  protective conductor running with it.


    So, I had a walk around the farm and there were no animals just lots of sheds and outbuildings. There was nobody to be seen. I saw many S.W.A. cables entering sheds and other buildings close to where the window man has his workshop. It appeared that the supply came from a locked shed then onto the window man's workshop. The place looked deserted. Today I noticed a planning notice to change use from agricultural to other uses, perhaps the owner is going to rent out the outbuildings.


    With nobody working there and no animals to kill I took Bod's advice and turned off one likely switch fuse by the meter. What could I lose?


    Blow me, when I went back to the window man's workshop I found that it was the correct one. The old switch fuse had no provision for locking off, so I removed the fuses and hid them safely away.


    I checked for a dead supply using three different tests. All dead. I was then able to connect up the new 4 way three phase distribution board easily. The Zs is 0.53 Ohms at the existing board in the window man's workshop. The earthing is P.M.E., which initially found strange for a farm.


    Z.


Reply
  • 0
    Job done. Hooray. Thanks for the advice all. I noted Mike's suggestion ref. S.W.A. sizes and markings. I could not see any markings but I measured the cables o/d  sizes. That left me with three possibilities in the meter shed, but no cable there had an external  protective conductor running with it.


    So, I had a walk around the farm and there were no animals just lots of sheds and outbuildings. There was nobody to be seen. I saw many S.W.A. cables entering sheds and other buildings close to where the window man has his workshop. It appeared that the supply came from a locked shed then onto the window man's workshop. The place looked deserted. Today I noticed a planning notice to change use from agricultural to other uses, perhaps the owner is going to rent out the outbuildings.


    With nobody working there and no animals to kill I took Bod's advice and turned off one likely switch fuse by the meter. What could I lose?


    Blow me, when I went back to the window man's workshop I found that it was the correct one. The old switch fuse had no provision for locking off, so I removed the fuses and hid them safely away.


    I checked for a dead supply using three different tests. All dead. I was then able to connect up the new 4 way three phase distribution board easily. The Zs is 0.53 Ohms at the existing board in the window man's workshop. The earthing is P.M.E., which initially found strange for a farm.


    Z.


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