I'll bet anyone who'll take it that it's not a faulty circuit breaker.
I would not personally disagree with any of that.If the electrician is not required to actually check that the sockets work then that makes no sense at all because, in effect, the installation is not fit for the purpose [ irrespective of the issue - MCB or whatever it subsequently proves to be] .... If the testing and certification regime does not include such a basic check then all I can say is that the entire system (IMHO) is flawed from the consumer's point of view.
Do I take it you mean that the (standard) tests do not necessarily mean it will work?John - Yes, I agree that the tests mean it will work.
Yes, as you say, I've often observed that one cannot test an MCBs overload functionality. However that does not mean that one cannot, or should not, test to make sure that it doesn't trip when a legitimate load is applied.However, there isn't, as you have commented in the past, any test for the MCBs so I suppose all you can do is switch on and if the customer has a problem later it will just have to be investigated then. ... We are thinking of an MCB tripping unnecessarily; what about the opposite?
Surely what we are discussing is a possible scenario in which testing by plugging in your test equipment would not necessary mean that "it can't NOT work" with a real load?As above - all the sockets should be tested, in fact. ... If not by plugging in a kettle but the test equipment and if all is satisfactory then really they can't NOT work.
How could that cause an MCB to operate in response to application of a very small load?It'll be an incorrectly connected RCD/RCBO
No, if all the tests are done then it will work.Do I take it you mean that the (standard) tests do not necessarily mean it will work?John - Yes, I agree that the tests mean it will work.
Quite.Yes, as you say, I've often observed that one cannot test an MCBs overload functionality. However that does not mean that one cannot, or should not, test to make sure that it doesn't trip when a legitimate load is applied.
When Belboz asked I took it to mean the actual socket did not work.Surely what we are discussing is a possible scenario in which testing by plugging in your test equipment would not necessary mean that "it can't NOT work" with a real load?
I can't disagree with that rule (albeit to implement in a on-line forum!), but, with that caveat ...I'll bet its not a circuit breaker which is tripping either. First rule of fault finding : disregard everything the customer thinks is wrong.
Its a volex MCB and CU , will an NSB20 Wylex fit ?
Hang on! - you can't 'not count' one of the things that would cause the circuit not to work, despite satisfactory 'standard test' results!!!No, if all the tests are done then it will work. I was not counting a faulty MCB.
Well, that's the same question RF is asking/implying - as you both say, if it were an RCBO, then the answer could be simple. What we do have is:Are we totally sure it is an MCB and not RCD which is tripping? It could be an RCBO on the non-RCD side..
madman41: As you've been asked before, does this volex device have a test button? What is written on it (model/type No. etc.)?Its a volex MCB and CU , will an NSB20 Wylex fit ?
Fair enough - but it could have been alright when fitted.Hang on! - you can't 'not count' one of the things that would cause the circuit not to work, despite satisfactory 'standard test' results!!!No, if all the tests are done then it will work. I was not counting a faulty MCB.
The question was asked.I can't disagree with that rule (albeit to implement in a on-line forum!), but, with that caveat ...I'll bet its not a circuit breaker which is tripping either. First rule of fault finding : disregard everything the customer thinks is wrong.Its a volex MCB and CU , will an NSB20 Wylex fit ?
Kind Regards, John
Added a picture hope this helps. and no test button on trip switch in house as its an MCB
... but that would be a different situation. I was talking about the situation (possibly like the OP's) in which the circuit was not 'alright' when installed (incapable to supply power to a load), despite satisfactory results from all the standard tests.Fair enough - but it could have been alright when fitted.Hang on! - you can't 'not count' one of the things that would cause the circuit not to work, despite satisfactory 'standard test' results!!!No, if all the tests are done then it will work. I was not counting a faulty MCB.
Ah, I missed that ... the evidence that it really is an MCB seems to be approaching overwhelming! ... and, relatively unusual though it is, that seems (to me) to make the 'faulty MCB' explanation ablout the only one I can think of.Added a picture hope this helps. and no test button on trip switch in house as its an MCB
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