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been working out what system this is here .. best i can work out is TNCS with added ground rod . earth wire connects to incoming neutral and also to a ground rod .. i was always told its TT but it can't be .Last edited by petehall347; 04-25-2024, 01:43 PM.
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ah i see whats been done now . its combined tns and tt which shouldn't be done . however it did provide grounding to the main system when the incoming ground neutral became detached from the ground . thinking best way of doing the mobile homes is having their own ground rods independent of the main supply by disconnecting the supply ground wires at the mobile homes supply and just using ground rods . TT .
this is how it stands but water pipe is ground rod . there is no metal water pipes on site .
[ATTACH=JSON]{"data-align":"none","data-size":"la...Last edited by petehall347; 04-24-2024, 04:12 AM.
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found something now and made it better . turned out the main earth rod that connects the supply neutral had corroded away so we no longer had that earth until i knocked it into the ground and watered it . now its just showing combined leakage of about 50 to 60ma . and the 2 other ground rods about 5ma as expected .
so its as i expected my supply and the other with ground rod was providing the earth .
plus i found the main cables were chewed by rats exposing the bare wires so coated them with conformal coating which lowered the leakage somewhat .
still not figured why the 30ma...
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latest findings today up till now . there are 2 of us that run off the supply from the rcd in question and we are about 120 metres maybe more from the supply .there is about 5ma leakage each measured across live neutral so that's good . now where it gets interesting is we both have local ground rods and both are carrying around 30ma each after isolating our consumer units so its looking like the problem is closer to source .our neutral to grounds measure about 1.2v so can call that good ....
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had a quick look today and getting leakage big style . i need to start isolating everything really and check again .. the main ground has about 60ma through it . the rcd tails are showing 28ma so should really be tripping . am thinking there is a bad neutral connection to find . might even be dc on the line blinding the rcd .. this is one of them jobs that can take 5 mins or 5 hours to sort out , ok the clamp meter i am not very impressed with it as the reading changes quite a bit depending on wire position . the instructions say wire in centre of clamp .well that is impractical really . ...
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i am a tenant and the electrics have always been a big mess here .
the big problem is there are 4 supplies maybe 5 from the rcd . we all have localised ground rods so no prob there . or that's part of it . 30ma rcd.s can trip around 21ma so it doesn't give us much leakage each . some modern equipment can soon add up to too much leakage if all on at same time . have been looking at loop testers and variable rcd testers . was looking at diy but better and easier to buy ready made .
my neutral ground is around 2v last time i checked .
pulling power from ground is something i have...
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