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Posted by Joseph Meehan on May 18, 2008, 2:53 pm
> letterman@invalid.com wrote:
>
>> HOW IN THE HECK CAN RUBBER CONDUCT ELECTRICITY ?
>
> It can't/doesn't.
>
>> Therefore, the rubber itself is conductive. WTF??????
>
> I suggest that, in the past, you have simply been LUCKY that your wet,
> plastic hose hasn't transmitted a shock.
>
> The rubber hose was probably wet and/or full of water which WILL conduct
> electricity.
Pure water is a very poor conductor. Salt water is at least a fair
conductor. Other things dissolved in water can increase its conductivity as
well.
Pure water has a very high resistivity, but it is finite. The value is
2.5x10^+5 ohm meters at 20C. and 1 atm pressure. In contrast, liquid mercury
has a resistivity of 9.58x10^-7
Rubber is usually a very good insulator (high resistance) but as noted,
rubber hoses are seldom all rubber. Rubber is not naturally black. Carbon
black is added to improve resistance to sun light in products like tyres and
hoses.
> Perhaps you were wearing different shoes, boots or
> overshoes when you got nailed.
>
> Just like your livestock has learned to avoid the wire, you have learned
> to NOT allow the hose (rubber or otherwise) to contact the working fence
> wire. Good luck although I don't think you'll need it: Once is enough
> to learn about the effects of a fencer.
>
> Also, ensure the fencer is properly grounded. Happy feeding.
> --
> :)
> JR
--
Joseph Meehan
Dia 's Muire duit
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