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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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    So, it appears that only direct contact with H.V. overhead lines may cause an electrocution.

    I wouldn't go that far - other risks will still be there even if the probabilities are lower. As that American document points out you can get a hazardous voltage gradient over the ground in some circumstances (Equipment touching the line, line down or a vanilla earth fault on the HV system) - so certainly still possible to be electrocuted without direct contact. I like the 'shuffle' idea (I'd only come across 'bunny hops' suggested before).

    Also note the US HV lines are generally more hazardous than ours - because they distribute a HV PEN conductor they have no means of detecting Earth faults - so their lines are almost always remain live under many fault conditions. This side of the pond HV connections are all L-L so earth faults currents can be distinguished from load current and most supplies will disconnect. Not 100% reliable as fault currents too low to cause disconnection can still easily kill, and not every HV circuit might have the disconnection equipment, but still far fewer dead bodies overall than with the American system.

       - Andy.

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  • 0

    So, it appears that only direct contact with H.V. overhead lines may cause an electrocution.

    I wouldn't go that far - other risks will still be there even if the probabilities are lower. As that American document points out you can get a hazardous voltage gradient over the ground in some circumstances (Equipment touching the line, line down or a vanilla earth fault on the HV system) - so certainly still possible to be electrocuted without direct contact. I like the 'shuffle' idea (I'd only come across 'bunny hops' suggested before).

    Also note the US HV lines are generally more hazardous than ours - because they distribute a HV PEN conductor they have no means of detecting Earth faults - so their lines are almost always remain live under many fault conditions. This side of the pond HV connections are all L-L so earth faults currents can be distinguished from load current and most supplies will disconnect. Not 100% reliable as fault currents too low to cause disconnection can still easily kill, and not every HV circuit might have the disconnection equipment, but still far fewer dead bodies overall than with the American system.

       - Andy.

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