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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
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    I think it's 25kV rather than 22kV and Network Rail rather than Railtrack  - but otherwise I'm in agreement with Graham. The bonding conductors can sometimes be much (much) larger than you'd expect from BS 7671 - presumably to cover the case where the return traction current is flowing through various bits of metalwork - which your temporary fencing might happen come into contact with.

      - Andy.
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  • 0
    I think it's 25kV rather than 22kV and Network Rail rather than Railtrack  - but otherwise I'm in agreement with Graham. The bonding conductors can sometimes be much (much) larger than you'd expect from BS 7671 - presumably to cover the case where the return traction current is flowing through various bits of metalwork - which your temporary fencing might happen come into contact with.

      - Andy.
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