Perhaps the U.S. Federal Dept of Agriculture could answer the question? 

Ralph Cameron
EMC Consulting and Suppression of Consumer Electronic Equipment
(After sale)

----- Original Message ----- 
From: "Nick Williams" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Friday, November 10, 2000 6:38 PM
Subject: RE: safe voltage limits for cattle ( cows horses etc)


> 
> 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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