questions about SWA and earthing

I'm wondering if the equipment for ponds are double insulated / SELV hence earthing is matter less?
The pump I reconnected yesterday wasn't - 3 core flex and the earth wire was definitely connected to something in contact with the water.
 
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I'm wondering if the equipment for ponds are double insulated / SELV hence earthing is matter less?
Ponds themselves are insulated, aren't they?

As in small garden ponds, I mean - I don't think people tend to build those using puddled clay, do they?
 
I imagine they'd have a plastic liner of some nature, wether or not this provides good electrical isolation I don't know. Might it act like a capacitor?
 

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