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Bonding of temporary metal fences at a Railway station platform

tattyinengland
HI Chaps


One of the jobs I need to do in the near future is bond some temporary metal fences at a railway station platform.


I would not normally bond metal fences, but I know that this a requirement in this case; metal fences, metal stairways from the platform up to the overhead concourse etc


The overhead train HV lines are probably 5m away from these fences.


Do anyone have any further information for me so that I can understand why we are bonding these fences and what we are trying to achieve? 


I suppose its something to do with the HV side of things..................


Any help would be much appreciated


Kind Regards


Tatty
Parents
  • 0
    Thank you Graham. 


    Wow I did not know that the actual track was a current carrying conductor...... I assume that there must be multiple earthed connections all the way down it (Perhaps to rods? or is the metal to ground contact sufficient due to the area of coverage?) 


    So in bonding this fencing and stairwells between the platform and the overhead concourse, I'm trying to achieve zero potential difference between those items and an HV earthed point?


    Does that mean my bonding needs to go back to the HV side of the transformer somehow/somewhere, because I'm sure from the little I've seen, the existing fence bonding seems to go into local - assumed by me - LV distribution cabinets/boxes - but I havn't seen into them yet and havn't had a chance to do so yet. 


    Anything to do with HV is totally outside of my experience, including the earthing side, but I'm half sure this is an LV earthing thing. Is that correct?


    Kind Regards


    Tatty
Reply
  • 0
    Thank you Graham. 


    Wow I did not know that the actual track was a current carrying conductor...... I assume that there must be multiple earthed connections all the way down it (Perhaps to rods? or is the metal to ground contact sufficient due to the area of coverage?) 


    So in bonding this fencing and stairwells between the platform and the overhead concourse, I'm trying to achieve zero potential difference between those items and an HV earthed point?


    Does that mean my bonding needs to go back to the HV side of the transformer somehow/somewhere, because I'm sure from the little I've seen, the existing fence bonding seems to go into local - assumed by me - LV distribution cabinets/boxes - but I havn't seen into them yet and havn't had a chance to do so yet. 


    Anything to do with HV is totally outside of my experience, including the earthing side, but I'm half sure this is an LV earthing thing. Is that correct?


    Kind Regards


    Tatty
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