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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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  • Former Community Member
    0 Former Community Member
    advice on pulling SWA along duct for over 100m would be uiseful too :-)   \\m/


    I'll see what you receive regarding proximity to HV and LV earthing but regarding cable pulling in duct, I have a very simple work rule approach:

    "whoever digs and buries the duct, pulls the cable in"


    I'll even lend them a cable sock to suit the cable size and put a heatshrink cap on the end of the cable!


    I've done many pulls over 250 m with up to 120 mm2 4c SWA but I've laid the duct.


    Last month's one some 50 miles away of 240 m with 16 mm2 4c SWA was the same policy and so glad.The builder put in 50 m coils of 104/110 duct and the blue 6 or 7 mm blue rope and 3/4 of way down the duct, the rope broke. I wasn't there to watch but he had to dig several holes and open up the duct to find the end and then cobra rod to put the rope back in. He blamed the rope but I think it could have been due the the drum jamming on unwinding from a lash up on a scaffold pole, or backfilling material not being graded crushing the duct and neither helped by using a tractor to pull the cable in!


    I use a 110 V capstan winch that fits onto the tow bar and am making up another, as I found a 0.37 kW 240 V one to adapt in exchange for half hour fault finding on a farm last week. I love bartering!!


    Regards


    BOD
Reply
  • Former Community Member
    0 Former Community Member
    advice on pulling SWA along duct for over 100m would be uiseful too :-)   \\m/


    I'll see what you receive regarding proximity to HV and LV earthing but regarding cable pulling in duct, I have a very simple work rule approach:

    "whoever digs and buries the duct, pulls the cable in"


    I'll even lend them a cable sock to suit the cable size and put a heatshrink cap on the end of the cable!


    I've done many pulls over 250 m with up to 120 mm2 4c SWA but I've laid the duct.


    Last month's one some 50 miles away of 240 m with 16 mm2 4c SWA was the same policy and so glad.The builder put in 50 m coils of 104/110 duct and the blue 6 or 7 mm blue rope and 3/4 of way down the duct, the rope broke. I wasn't there to watch but he had to dig several holes and open up the duct to find the end and then cobra rod to put the rope back in. He blamed the rope but I think it could have been due the the drum jamming on unwinding from a lash up on a scaffold pole, or backfilling material not being graded crushing the duct and neither helped by using a tractor to pull the cable in!


    I use a 110 V capstan winch that fits onto the tow bar and am making up another, as I found a 0.37 kW 240 V one to adapt in exchange for half hour fault finding on a farm last week. I love bartering!!


    Regards


    BOD
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