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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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    @mapj   thank you.  Dont spend time on it. I am going to have to discuss further with property owner in any case.


    Thank you all for the contribution - as always, most helpful.


    For completeness and in case anyone is interested, the distributor has effectively stated clearly to avoid their 'hot zone' of any metal work rising from the ground etc  and anything near to the boundary to be all insulated - with any buried cables kept as far away as poss and if they cross, to have them in non-conductive ducting.    They were unable to provide details due to not having enough soil resistivity records, but did once again stated in this TX case  the 9m radius is their recommendation.   I did get back some figures of,  for the 20 ohm electrode, expect worst case to be a rise of earth potential of ~4900V.


    It would be folly without any other engineering expertise and calculation etc...to ignore the advice, so Im happy to adhere to it !


    Thank you again all.

    Habs
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  • 0
    @mapj   thank you.  Dont spend time on it. I am going to have to discuss further with property owner in any case.


    Thank you all for the contribution - as always, most helpful.


    For completeness and in case anyone is interested, the distributor has effectively stated clearly to avoid their 'hot zone' of any metal work rising from the ground etc  and anything near to the boundary to be all insulated - with any buried cables kept as far away as poss and if they cross, to have them in non-conductive ducting.    They were unable to provide details due to not having enough soil resistivity records, but did once again stated in this TX case  the 9m radius is their recommendation.   I did get back some figures of,  for the 20 ohm electrode, expect worst case to be a rise of earth potential of ~4900V.


    It would be folly without any other engineering expertise and calculation etc...to ignore the advice, so Im happy to adhere to it !


    Thank you again all.

    Habs
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