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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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    A certain Nuclear Power Station near Edinburgh has a similar problem as the instrument earth cables (and there were the best part of 50,000 of them) all had their screens and armour separately earthed only to a central Earth Bar. This was achieved using insulated glands at every junction box and carefully designed earth bonds between the glands of the multicore cables back the the control room and the smaller cables to the instruments.

    The risk of this arrangement arose if someone was touching one of these glands when a fault occurred on the 400kV substation nearby but this was calculated and deemed small.

    As an added safety feature in the situation being discussed, if the insulated gland is made off first then the risk of anyone getting a shock while touching the gland during an HV earth fault is even lower.
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    A certain Nuclear Power Station near Edinburgh has a similar problem as the instrument earth cables (and there were the best part of 50,000 of them) all had their screens and armour separately earthed only to a central Earth Bar. This was achieved using insulated glands at every junction box and carefully designed earth bonds between the glands of the multicore cables back the the control room and the smaller cables to the instruments.

    The risk of this arrangement arose if someone was touching one of these glands when a fault occurred on the 400kV substation nearby but this was calculated and deemed small.

    As an added safety feature in the situation being discussed, if the insulated gland is made off first then the risk of anyone getting a shock while touching the gland during an HV earth fault is even lower.
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