Discussion
Looks like the RCD on the sex pond is faulty:

Diagnosis based on - it was full of water, when dried out worked a bit but keeps tripping. Connecting the pond directly to a plug FOR TEST PURPOSES ONLY it works fine.
I don't think there is anything fundamentally different between the above in-line RCD, and plugging directly into something like this:
https://www.screwfix.com/p/british-general-ip66-13...
other than that the in-line RCD forces you to use one.
Circuit is on RCBO at the consumer unit anyway. However electricity + pond + family needs due caution, natch. Thoughts?

Diagnosis based on - it was full of water, when dried out worked a bit but keeps tripping. Connecting the pond directly to a plug FOR TEST PURPOSES ONLY it works fine.
I don't think there is anything fundamentally different between the above in-line RCD, and plugging directly into something like this:
https://www.screwfix.com/p/british-general-ip66-13...
other than that the in-line RCD forces you to use one.
Circuit is on RCBO at the consumer unit anyway. However electricity + pond + family needs due caution, natch. Thoughts?
404 Page not found said:
I'm guessing that one has a trip current of 10mA, whereas the socket will be 30mA. It'll be fine though.
I'm hoping you are being sarcastic.OP: what is the trip rating on the dead RCD? I wouldn't want to get into a hot tub fed with a 30mA trip.
https://toughleads.co.uk/products/replacement-hot-...
Edited by Mr Pointy on Monday 14th June 18:30
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