RCD suddenly Tripping

[bren1916]

Is there anything else connected without a plug? Boiler, lights, garden circuit, cooker?

Only the house alarm and that’s the first thing I did last night was swap out the 13a fuse to that.

 

[JohnD]

That does not disconnect the neutral conne tor.

Neither do light switches

Modern switched spurs usually do (e.g. for a boiler)

 

[EFLImpudence]

Please don't call them spurs.

 

[pcaouolte]

Please don't call them spurs.

It might confuse Totenham fans and cowboys.

 

[JohnD]

Please don't call them spurs.

But what term does OP know?

 

[SUNRAY]

Please don't call them spurs.

I agree the accessory with a switch is not a spur..

But...

But what term does OP know?

I'll usually stick whith what the other person understands as long as it makes sense and isn't likely to cause confusion.
There could just about be an arguement for the switch/fuse device, the cable and the sockets on the end to be collectively called a socket spur, I personally wouldn't but if a customer was describing that part of a bigger circuit as such I'd rather we understood each other and fall in line.

 

[crystal ball]

I did some work for a guy who called every accessory a plug, and pronounced conduit "condwee"

 

[SUNRAY]

and pronounced conduit "condwee"

Isn't that the French pronounciation... Oh won't that be where the word came from?

 

[EFLImpudence]

Isn't that the French pronounciation?

Wee.

 

[SUNRAY]

Wee.

Now now no need to p155about

 

[bren1916]

Update: turns out it was wiring arcing in a bedroom socket causing the issues. Seems to be sorted now but took hours to locate, even with all the MCB’s off in that CU the RCD was still tripping. Thanks for all help & advice offered, much appreciated

 

[SUNRAY]

Update: turns out it was wiring arcing in a bedroom socket causing the issues. Seems to be sorted now but took hours to locate, even with all the MCB’s off in that CU the RCD was still tripping. Thanks for all help & advice offered, much appreciated

It seems strange that it was arcing with the power off, however I've stopped being surprised by symptoms and causes.

 

[bren1916]

It seems strange that it was arcing with the power off, however I've stopped being surprised by symptoms and causes.

Agreed, but even with every MCB off on CU#1, plugging any appliance into a socket served directly by the CU#2 tripped the RCD on CU#1 which just added to the confusion. Seems the electrician that installed CU#2 didn’t do everything by the book which is disappointing.

 

[SUNRAY]

Agreed, but even with every MCB off on CU#1, plugging any appliance into a socket served directly by the CU#2 tripped the RCD on CU#1 which just added to the confusion. Seems the electrician that installed CU#2 didn’t do everything by the book which is disappointing.

These things do crop up sometimes even when correctly installed. I recall RFlighting (one of our highly respected contributers) posted a video on here showing very strange behaviour of RCBOs in a CU or Distribution Board interacting with each other.