unlikely or not it happens .. Seen it enough times on different installs .. Sometimes it does sometimes it doesn't..I would find it highly unlikely that the RCD would ever trip with a lamp blowing.
i will let the professionals debate that... I've witnessed it .. All I know is it happens..So, what is the fault path that causes an RCD to trip when a load such as a lamp with no physical connection to earth fails?
You haven't.i will let the professionals debate that... I've witnessed it .. All I know is it happens..
Then it is perfectly legal for you to do the work yourself - you don't need to notify anyone.Yes it would be using an existing lighting circuit.
It does have RCD protection on a board for the lighting circuit on that 1 floor.
No not a bathroom it's a bedroom .. With a unboarded loft above it which makes access easy. Hence why I even considered doing it myself. I assume work like this has to be certified to meet local authority rules these days..
your diyer never said he was a professional so fail to see why you want to trip him up .... Seems unhelpful... Suspect I got the views I can work with . Thank you everyone who responded ..Here was me trying to get the DIYer to trip himself up and so called electricians fall into the trap as well!You haven't.
If there was a leakage current neutral to earth which under normal loads would not trip the rcd, if an arc forms during the blowing of a filament, high currents occur and any leakage current might increase past the tripping current of an RCD. Would this do it?So, what is the fault path that causes an RCD to trip when a load such as a lamp with no physical connection to earth fails?
+1Just be careful mate and if you are not sure of anything. Call someone in. Underneath all the unhelpfulness and sarcasm is a bunch of forum members that do not want to see anyone hurt.
Theoretically possible, highly unlikely, and even less likely that anyone has seen this happen hundreds of times, definitely not be a common occurrence.If there was a leakage current neutral to earth which under normal loads would not trip the rcd, if an arc forms during the blowing of a filament, high currents occur and any leakage current might increase past the tripping current of an RCD. Would this do it?
In our old house the MCB always tripped when a lamp blew.Theoretically possible, highly unlikely, and even less likely that anyone has seen this happen hundreds of times, definitely not be a common occurrence.
Measure the voltage on the N-E.After safe isolation of a circuit (mcb), cutting a cutting a cable will sometimes trip an rcd. I haven't worked that one out.
would induced currents to the bare cpc in t&e under arcing conditions be enough to trip it?Theoretically possible, highly unlikely, and even less likely that anyone has seen this happen hundreds of times, definitely not be a common occurrence.
Yeah that would explain the tripping on cutting, so it couldn't have been "safe" isolation then.Measure the voltage on the N-E.
After safe isolation of a circuit (mcb), cutting a cable will sometimes trip an rcd. I haven't worked that one out.
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