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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
    What about using insulated glands on one end of each SWA so that the lamp post, which is earthed by its bolts into the ground, serves as the earth connection for the armour of one of the SWA cables connected to it but there is no earth connection from any of the lampposts back to the source of the LV.

    The maximum voltage difference which anyone could touch would be across one of the insulated glands but the chances of anyone removing the shroud and touching the gland when there was an HV fault will be minute and the voltage not that great either. If the holding down bolts do not give a sufficiently low resistance to clear a fault then additional earth rods might be required at each lamppost.
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  • 0
    What about using insulated glands on one end of each SWA so that the lamp post, which is earthed by its bolts into the ground, serves as the earth connection for the armour of one of the SWA cables connected to it but there is no earth connection from any of the lampposts back to the source of the LV.

    The maximum voltage difference which anyone could touch would be across one of the insulated glands but the chances of anyone removing the shroud and touching the gland when there was an HV fault will be minute and the voltage not that great either. If the holding down bolts do not give a sufficiently low resistance to clear a fault then additional earth rods might be required at each lamppost.
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