What does that mean, on its last core?Just noticed my earth rod is on its last core so need cutting and reconnecting dumb as it may sound do I need to turn off power
Thanks
I think I need some education here. Under what circumstances is it necessary, or even desirable, to "keep a safe distance" from an earth rod - and, while we are at it, what is that "safe distance"?The whole idea of this View attachment 300362 is to keep you a safe distance from the earth rod,....
Unless an earth fault occurs in the installation at the time. If that happens the earth wire will be at 230volts. This could be fatal to the OP.I would turn off supply before fixing and wear gloves, but likely even if you don't you will not get a shock.
The actual load is irrelevant. One needs to consider the 'worst case' scenario, which would be a low-impedance L-E fault, leading to the potential of the earth rod (above 'true earth') rising to virtually supply potential (230 V or whatever).I would also like to know safe distance, since an earth rod can be 60 Ω, a 3 kW heater connected to earth instead of neutral due to a fault, would raise the voltage at the earth rod to 177 volt, this would reduce as the distance to earth rod is increased, ...
I think that's roughly true - but it's the direction of the gradient I'm talking about ....It seems the gradent is in a logarithmic progression,
The gradient' is a gradient over distance. What point are you trying to make?and the distance will also affect the effect,
I'm not sure of the voltages for different species, but large 4-legged animals are obviously at greater risk, since they have the ability to have quite large distances between points of contact with the ground, which can be an issue if there is a very large voltage gradient.seems 25 volt is enough to kill a cow,
I don't think you'll ever find a general answer to that question, because 'it depends' on so many factors in an individual case.Using 4 legs worse than 2, and shoes clearly help, and the larger the stride the worse, but as yet not seen any figures as to at what distance the gradent is safe.
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