Rcd spur

[ericmark]

I assumed that was the case. However my point was RCD's do seem to trip for what seems no reason and likely due to spikes on the supply. I have noted my mothers RBCO's have never tripped, and my son and daughters do not seem to have as many trips as we get, I will assume because mine are old and no electronics?

 

[Taylortwocities]

I will assume because mine are old and no electronics

Its known as the natural hostility of inanimate objects

 

[endecotp]

For some reason which I don't understand, the test button on RCD sockets (and maybe also RCD FCUs) appears to create a L-E 'fault' for the test

An advantage of doing it that way is that it proves earth connectivity to the socket.

 

[EFLImpudence]

Plus, of course, stand-alone RCDs don't have an earth to do it that way.

 

[Iggifer]

Plus, of course, stand-alone RCDs don't have an earth to do it that way.

MEM circa MEMERA 2000 boards did. Just saying! Not sure whether they actually used it for testing but they had a FE

 

[securespark]

More…. waht make is the RCD spur, Greenbrook?
If so then there are some very similar stories to yours on the Screweyfix site
CLICK

And here....me and RF are not exactly fans of Greenbrook's handiwork...

 

[JohnW2]

For some reason which I don't understand, the test button on RCD sockets (and maybe also RCD FCUs) appears to create a L-E 'fault' for the test

An advantage of doing it that way is that it proves earth connectivity to the socket.

That is true, but it can also result in problems if there is another upstream RCD.

Kind Regards, John

 

[JohnW2]

Plus, of course, stand-alone RCDs don't have an earth to do it that way.

Indeed, give that hardly any RCDs have an earth connection, it's clear why their test button does what it does. What I was pondering/asking was why RCD sockets do not (usually, if ever) do the same thing - but endecotp has given one possible explanation.

Kind Regards, John

 

[JohnW2]

I assumed that was the case. However my point was RCD's do seem to trip for what seems no reason and likely due to spikes on the supply.

Experiences obvioulsy vary. I have lived with about a dozen RCDs for 20+ years, and cannot recall any occasion on which one has operated 'without good reason'.

I have noted my mothers RBCO's have never tripped, and my son and daughters do not seem to have as many trips as we get, I will assume because mine are old and no electronics?

Possibly, although I would have expected the opposite - that RCDs with electronics (which virtually all now seem to be) would be more susceptible to 'nuisance trips'

Kind Regards, John

 

[EFLImpudence]

Plus, of course, stand-alone RCDs don't have an earth to do it that way.

Indeed, give that hardly any RCDs have an earth connection, it's clear why their test button does what it does. What I was pondering/asking was why RCD sockets do not (usually, if ever) do the same thing - but endecotp has given one possible explanation.

I would think it is because they can but endecotp explanation is very useful.