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Ok thanks WestwardI would go for this as it offers double pole isolation whereas the rcbos do not.
Discuss Need some ideas - RCD tripping but everything tests fine.... in the UK Electrical Forum area at ElectriciansForums.net
Ok thanks WestwardI would go for this as it offers double pole isolation whereas the rcbos do not.
I don't have one, useful, probably invaluable but not essential. I do a lot of fault finding jobs as well.Maybe start a thread asking for recommendations?
Doing domestic, a earth clamp meter is essential...
So does a main switch.I would go for this as it offers double pole isolation whereas the rcbos do not.
Uh-Oh look what I've started now......So does a main switch.
what's the betting he will have to go back!So far the 'swapped' RCCB hasn't gone again
Isolation was probably the wrong wording. A single pole rcbo may disconnect the circuit as required under certain fault conditions but does not disrupt the neutral which is considered a live conductor, a double pole upstream rcd will.So does a main switch.
Tin hat on I've never quite got the significance of disconnecting the neutral on a TT. If an RCBO wont disconnect it on a TT it wont on a TN , so whats the difference?>Isolation was probably the wrong wording. A single pole rcbo may disconnect the circuit as required under certain fault conditions but does not disrupt the neutral which is considered a live conductor, a double pole upstream rcd will.
Why is there nothing in 7671 about sp RCBO's on TT systems?Neutral is deemed being at earth potential for TN systems.
Cos I suppose there's a main switch that isolates both Live & Neutral, but I'm no expert here!
It is a much discussed grey area. An rcbo is not there to necessarily provide isolation but disconnection in the event of a fault which a single pole device will do. It confuses me and it is not clear anywhere with mixed opinions given.I know I've read somewhere about SP RCBO's not being suitable for TT systems but cant remember where and am still sceptical. In fact on our last NICEIC visit I asked the question and got a blank look.
If anyone can shed any light......
No, it's tripping at 19mA on ramp test with everything on. (23mA disconnected). So there is nornally 4mA leakage.Coming into the discussion a bit late, but isn't 8 megohm a bit on the low side (I relegalise its within acceptable limits) for a two up two down. Wouldn't it be an idea to get that to a higher figure, then dodgy appliances wouldn't have such an impact?
OP did you say you've measured 19 mA? Think most 30mA RCD start tripping at 21, so you've not much scope.
Not that I can see. Why do you ask - can a dirty supply operate RCDs????Any industrial workshops ,garages nearby ?
(or road dug up for new street lights ?)
Reply to Need some ideas - RCD tripping but everything tests fine.... in the UK Electrical Forum area at ElectriciansForums.net
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