I remember being told once that cows are particularly susceptible to electric shock, although it was in one of those conversations which was completely unattributable.

ISTR there is something in the EN60335 series which covers this. 60335-2-71 (Appliances for breeding and rearing animals) is not quite the right thing (I have a copy in front of me) since it deals mostly with heating appliances (heat lamp, incubators) but it does (in effect) specify an upper limit of 24V for parts with which animals might possibly come into contact (section 6.1).

I can't add further to the information already supplied w.r.t electric fencers, but have you thought about looking at milking machine standards?

Hope this helps

Nick.

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