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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
    The issue as I was earlier thinking, is to limit any touch type voltage if unfortunately in contact with the metal work of the lamp post on its rods and pad (and anything else connected to it) during a HV fault and the ground or any other earthed position (but that would be unlikely with the distances between posts etc).  The closer the lamp post is to the HV electrode the worse it all gets.  Local LV circuit earth rods just add to the connection to the ground of course (like the concrete pad and threaded rods) of the lamp post setup so are not really solving anything in the HV fault case ?


    Not connecting each lampost together (using the insulating gland idea on the SWA earlier mentioned) would seem to be an option to limit cable based propogation of the voltage to other posts on the circuit.  It would be unlikely that any more than one post would be close to HV electrode area too.


    As I mentioned (other than all fully insulated lamp post setup perhaps if that were feasible) avoiding the vicinity (~9m in this case as suggested) of the HV electrode for a lamp post is really the better the choice (perhaps along with some other bolstering options as mentioned if really needed).


    AlanCapon has captured what I was trying to get my head around.


    Does everyone agree ?
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  • 0
    The issue as I was earlier thinking, is to limit any touch type voltage if unfortunately in contact with the metal work of the lamp post on its rods and pad (and anything else connected to it) during a HV fault and the ground or any other earthed position (but that would be unlikely with the distances between posts etc).  The closer the lamp post is to the HV electrode the worse it all gets.  Local LV circuit earth rods just add to the connection to the ground of course (like the concrete pad and threaded rods) of the lamp post setup so are not really solving anything in the HV fault case ?


    Not connecting each lampost together (using the insulating gland idea on the SWA earlier mentioned) would seem to be an option to limit cable based propogation of the voltage to other posts on the circuit.  It would be unlikely that any more than one post would be close to HV electrode area too.


    As I mentioned (other than all fully insulated lamp post setup perhaps if that were feasible) avoiding the vicinity (~9m in this case as suggested) of the HV electrode for a lamp post is really the better the choice (perhaps along with some other bolstering options as mentioned if really needed).


    AlanCapon has captured what I was trying to get my head around.


    Does everyone agree ?
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