Online assistance for electrical trade people Login  |  Register  |   Forgot Password
Assistance for electrical trade people




Click here to send Ron a pdf document for publication on this Topic

Documents must be less than 200k in pdf format

Posted By Topic: cow shed

Aug 17 2016 15:33

Are there any common problems to look for in a cow shed if the cows don't like one side of the rail. I have not been to the job yet but the farmer explains it that the cows don't like the right side of his shed. I did ask if anything has changed and he said its the same side as that the milk pump vsd is mounted on which was done a little while ago but the cows also get rattled when the wash down pump is flicked on.

Aug 17 2016 16:14

There's an entire handbook available from SNZ on cowsheds(HB 6117; $85.50).

It doesn't take much touch voltage to upset cows; and you need to follow very good earthing & bonding practices, including ensuring ow impedance to HF currents
You'l also need an oscilliscope rather ythan a normal volmetert designed for 50 Hz

Aug 17 2016 18:02

I spent may weeks finding a similar problem.

The problem was it would come a go and seamed to to get worse when it rained but not always.

Impedance meter is your friend.

assuming 3 phase supply

At the main switch Check

L1 - N
L2 - N
L3 - N

L1 - L2
L2 - L3
L1 - L3

Assuming the cable size are all the same you should get similar reading.

I was getting a high reading on the neutral cable (6 Ohms from memory) took me ages to find a bad connection join in the cable.

There is a AS/NZS standard that has a test procedure in it for testing neutrals, can remember the number


Aug 17 2016 18:26

AS/NZS 3017:2007
Electrical installations - Verification guidelines

Sep 19 2016 11:20

Is there anyone providing straight out testing for dairy sheds? An independent report would be beneficial.

Sep 19 2016 11:39

"Is there anyone providing straight out testing for dairy sheds? An independent report would be beneficial."

Can you explain more?

Sep 19 2016 19:02

Corkill systems offer a service for hunting down stray voltages in dairy sheds.


Sep 21 2016 10:43

Thanks Sarmajor. Looks like Advanced Dairy do it too. Bit closer to home. Cheers.