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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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    Sparkingchip:..

    <snip>

    so so how do you install a cable without armour buried in a duct?




    If you are are a DNO,  earthed concentric wiring, but if you are to BS7671 then you can still use an armoured cable - the armour can remain earthed at the origin and linked to be continuous all the way along, and will do its duty and  blow the supply fuse when a digger finds it, but until that moment, the armour does not have any connection to the terra-firma around it.

    PS I'm not a street light expert, I'm transplanting knowledge of things done near radio transmitters, where earthing and and what is at what voltage also matter. Things like aircraft warning  lights on transmitter towers are something else, and involve isolation transformers in strange places.


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  • 0
    Sparkingchip:..

    <snip>

    so so how do you install a cable without armour buried in a duct?




    If you are are a DNO,  earthed concentric wiring, but if you are to BS7671 then you can still use an armoured cable - the armour can remain earthed at the origin and linked to be continuous all the way along, and will do its duty and  blow the supply fuse when a digger finds it, but until that moment, the armour does not have any connection to the terra-firma around it.

    PS I'm not a street light expert, I'm transplanting knowledge of things done near radio transmitters, where earthing and and what is at what voltage also matter. Things like aircraft warning  lights on transmitter towers are something else, and involve isolation transformers in strange places.


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