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11kV Overheads and Water Spray.

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You a are farmer. You have potato fields that need watering due to the lack of rain and the hot weather. You tow your water sprayer trailer out to the potato field and connect up the pipes. The water can be mains or deep bore hole sourced. The spray is very high pressure and reaches a great height. In fact it reached the 11kV overhead cables that run across your field.

Is there any danger?

Here is a static system, but yours is mobile on a tyred trailer. It does though show the height of the sprays.

Large Lawn Field Irrigation System - Bing video

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    Reasonably clean fresh water isn't a particularly good conductor. We already know that a few cm of water in a plastic pipe usually has sufficient resistance to prevent an electric shock. An 11kV line is 11kV L-L so around 6.35kV L-earth -  so less than 30x 230V - so even if we had a continuous column of water between the nozzle and HV line, and taking into account the larger c.s.a. compared to a 15mm pipe, it seems plausible we'd still have a reasonable resistance in our favour.

        - Andy,

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  • 0

    Reasonably clean fresh water isn't a particularly good conductor. We already know that a few cm of water in a plastic pipe usually has sufficient resistance to prevent an electric shock. An 11kV line is 11kV L-L so around 6.35kV L-earth -  so less than 30x 230V - so even if we had a continuous column of water between the nozzle and HV line, and taking into account the larger c.s.a. compared to a 15mm pipe, it seems plausible we'd still have a reasonable resistance in our favour.

        - Andy,

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