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tank/hv earth electrode and nearby concrete pad with mounted lighting column

psychicwarrior
Hello - good day to all !


Any experience/experiences that might provide a few tips/watch out fors etc, most gratefully received.


Contemplating the run of buried SWA cabled over 100m for outdoor lighting (and electric gates) passing by a pole mounted transformer, where it's been confirmed by the distributor that there is a Tank/HV earth electrode setup  at the pole. Whilst explaining this was not a rigid rule (more a guide and just as well as it shuts off the only feasible route), it was suggested best [in this case] to stay out of a 9m radius if burying cables - but the situation would be helped if this had to be compromised, by running the cabling in ducting/conduit when in the ground.


What are opinions on the siting of concrete pads with threaded rod to secure [conductive] column lighting in this context; this would seem a more serious concern within the 9m advice, is it a no-no, is there anything that can be done to mitigate (aside to using all non-conducting materials), or is it a non-issue (I feel not) ? 


I have no experience of such a long distance, but any tips and advice on pulling SWA along duct for over 100m would be uiseful too :-)   \\m/


Thank you all

Habs

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  • 0
    Interesting question about the Earthing arrangement.


    I guess another possible approach would be to make each lighting column etc its own little TT island with its own independent local electrode - that way it's remains at the same(*) potential as the ground it is stood on - whatever that might be.


    (*) well same-ish - TT earths can be a little different from the actual potential of the soil around the rod due to leakage currents and the electrode resistance - but usually that's not too significant.


       - Andy,
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  • 0
    Interesting question about the Earthing arrangement.


    I guess another possible approach would be to make each lighting column etc its own little TT island with its own independent local electrode - that way it's remains at the same(*) potential as the ground it is stood on - whatever that might be.


    (*) well same-ish - TT earths can be a little different from the actual potential of the soil around the rod due to leakage currents and the electrode resistance - but usually that's not too significant.


       - Andy,
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