Warp wrote:
> because it will be I = 40kV/R, which is much higher than with a wall socket,
> where it's I = 230V/R.

You're assuming the same R in both cases here, also. However, with a wall 
socket, R is the resistance of the human, while with the fence, R is the 
resistance down to the ground, which includes shoes, grass, perhaps gloves, 
etc. Also, if you grab the fence with both hands, you're not going to get 
current across your heart; at least, not like you do with a socket.

-- 
Darren New, San Diego CA, USA (PST)
    Ada - the programming language trying to avoid
    you literally shooting yourself in the foot.

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