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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
    Do you need  a lighting stand within 9m of the TX electrodes, or just a cable route? The cable could be in a plastic pipe, then we would not care if the ground around it is ever live or not.  - the problem only arises is if a touchable lamp post is 'planted' within the  near field of the electrode.

    Even then so long as  the  exposed lamp post voltage can rise and fall with the local surface voltage, this is  the best case. The only hiccup is as Alan alludes, as there will be a definte slope in the ground potential ,  the lamp post poses  a comparable hazard to the bare foot step voltage.  

    Actually a concrete column or a one with a fibreglass clad base might be quite sensible, both exist.
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  • 0
    Do you need  a lighting stand within 9m of the TX electrodes, or just a cable route? The cable could be in a plastic pipe, then we would not care if the ground around it is ever live or not.  - the problem only arises is if a touchable lamp post is 'planted' within the  near field of the electrode.

    Even then so long as  the  exposed lamp post voltage can rise and fall with the local surface voltage, this is  the best case. The only hiccup is as Alan alludes, as there will be a definte slope in the ground potential ,  the lamp post poses  a comparable hazard to the bare foot step voltage.  

    Actually a concrete column or a one with a fibreglass clad base might be quite sensible, both exist.
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