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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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    I'll have a good look tonight for a link on-line , but basically it is really a "by request" option applied to the standard metal poles at the factory, I think originally  to make them last longer when installed at seasides and in contaminated ground with high acidity or whatever. The process is that either just the roots, or the whole thing, is covered in in a thin overlayer of glass fibre and resin, which as well as being weather proof is also a  very much an insulator. It is then over painted.  I imagine it is one of those 'call us for special options' type of things, as I cannot quickly see it in the catalogues.

    Also on the 'options' front many of the steel post designs can either have a root for burial like a spike, or can be fitted with a welded flat flange about a foot square with holes for large bolts, so you do not have to have metal deep in the earth if you do not mind forming  a large concrete cube instead. Equally the forces are substantial so that requires some mech eng input to do safely.

    The more common (=cheap) and more or  less standard  corrosion proofing  is that the end of the thing is dipped into some trouser-wrecking sticky gunk that looks like tar, but that is not what you want at all.

    I need to back track on what I said about concrete posts - apparently no one wants them any more, so new ones are not being made- I imagine the sheer weight and perhaps what they do in a car crash has lead to their falling out of favour.
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    I'll have a good look tonight for a link on-line , but basically it is really a "by request" option applied to the standard metal poles at the factory, I think originally  to make them last longer when installed at seasides and in contaminated ground with high acidity or whatever. The process is that either just the roots, or the whole thing, is covered in in a thin overlayer of glass fibre and resin, which as well as being weather proof is also a  very much an insulator. It is then over painted.  I imagine it is one of those 'call us for special options' type of things, as I cannot quickly see it in the catalogues.

    Also on the 'options' front many of the steel post designs can either have a root for burial like a spike, or can be fitted with a welded flat flange about a foot square with holes for large bolts, so you do not have to have metal deep in the earth if you do not mind forming  a large concrete cube instead. Equally the forces are substantial so that requires some mech eng input to do safely.

    The more common (=cheap) and more or  less standard  corrosion proofing  is that the end of the thing is dipped into some trouser-wrecking sticky gunk that looks like tar, but that is not what you want at all.

    I need to back track on what I said about concrete posts - apparently no one wants them any more, so new ones are not being made- I imagine the sheer weight and perhaps what they do in a car crash has lead to their falling out of favour.
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