Kiwi,
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This would be important in areas such as milking sheds where electrical equipment is directly connected to live beasts.
I don't think I understand what you are saying here.
All of the cups and vacuum equipment are isolated from Earth, using rubber hoses, sure they do use peristaltic type pumps, but the less metal you have in a place like a dairy shed, the better off you are.
I will say this for free, after we changed over to AS/NZS 3000, animals were afforded the same protection as humans, from electric shock, which sets up an interesting scenario, considering we use electric fences.
An Electric fence on an RCD??. [Linked Image]
We'll see what Brian says.
It'll be worth reading I can tell you!!. [Linked Image]