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28-11-2020, 11:50 AM #1
How to test for electricity leak?
Started netting some fish to give them a once over, one of the koi seems to have a bent back.
Now I look at the fish everyday and never noticed this and is very prominent now I've seen it.
So I've either damaged it when netting (hopefully not the case!), disease or potential electric leak. So wanting to cover all bases and wanted to check an electric leak.
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28-11-2020, 02:36 PM #2
multi meter, ~240V
negative probe to earth and positive tip in water.
though you may get some induced voltage from pumps/heaters.
it should be low, less than 10v
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28-11-2020, 03:20 PM #3
cheers
so test it as it's all running, then if i switch it all off does it lose any charge straight away?
then i can turn one each item 1 by 1, testing as i go?Last edited by CBKOI; 28-11-2020 at 03:31 PM.
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john1 Thanked / Liked this Post
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03-12-2020, 09:44 AM #4
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06-12-2020, 11:26 AM #5
If you have RCD or RCBO protection on your pond electrics that should start to trip out if you are leaking more than about 20 to 25 mA from live or neutral to earth even on a 30 mA trip as you'll have a slight leak on most things that on their own won't trip but when added together will trip.
Dave's idea sounds like a good place to start though and if you detect any voltage it's probably a good idea to swap the item that's causing it before it becomes a bigger problem.
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06-12-2020, 04:10 PM #6
Im trying to remember where i read it. But outside electrics can get very tricky depending on what you incoming supply is TT, TNS, TNCS.
They had a broken neutral on a site i worked on years ago for temporary power. When a digger clipped a power cable.
Everything metal and bonded to earth went live and nothing tripped!.
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Frimley Koi keeper, freddyboy Thanked / Liked this Post
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06-12-2020, 06:17 PM #7
Sounds like a bad one.
You would have thought that if it was damaged while it was live it would have tripped something but if it not live and livened up later maybe it wouldn't have tripped when livened up as the RCD might not have been able to register the fault if that makes sense?
I would have thought that PME would be the one that might not register a neutral earth issue in the right or wrong situations maybe?
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davethefish1, freddyboy Thanked / Liked this Post
The Daily pond temp thread
Just kept 12 overnight for the first time. Hitting 12.8 in the daytime but bang on 12 first thing...