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RCD TRIPPING after hoover gets plugged in

It did but no one has commented on your post.

Were you not correct in saying both should have tripped with the neutral in the wrong bar?

Does that not suggest the other might be suspect?
Indeed. Both RCDs see an imbalanced current flow, one on the live, the other on the neutral. Unless, as Martygturner suggested, the neutral somehow ended up on the non-RCD neutral bar.
 
Indeed. Both RCDs see an imbalanced current flow, one on the live, the other on the neutral. Unless, as Martygturner suggested, the neutral somehow ended up on the non-RCD neutral bar.

When two RCD's, are in series, and an imbalance occurs, either rcd can trip, it will be a race situation - the first to trip, will then remove the imbalance. I have never known both in series to trip, but I suppose it might be possible.
 
What do you mean by 'in series'?

If a circuit neutral is placed in the neutral bar of the another RCD then they will both trip.
Just imaging placing one RCBO's circuit neutral in the neutral terminal of another RCBO.

In this thread, I, and presumably Ragnar, didn't think about a third neutral bar - high-integrity board.
 
Yes, just didn't get why some were saying only one tripped.
 
Sorry if I have confused everyone - I obviously misread something somewhere.

Still not exactly sure of the situation.
 
But both should trip, as both have an imbalance.
,
The imbalance disappears, as soon as the first (most sensitive) one trips, so with the imbalance removed, why would the second one trip?

My outdoor supply, feeding garage, workshop, summerhouse, and several sockets, is fitted with a self-contained RCD, at the garage end. I added an RCD at the house-supply end, leaving the second. I sometimes do, accidentally, cause the RCD, one, or the other to trip.

Which one of the two which trip, is completely random. I don't recall ever having both simultaneously trip.
 
My outdoor supply, feeding garage, workshop, summerhouse, and several sockets, is fitted with a self-contained RCD, at the garage end. I added an RCD at the house-supply end, leaving the second. I sometimes do, accidentally, cause the RCD, one, or the other to trip.
That's not the same as a neutral in the wrong bar.

Move one of your neutrals and see what happens.
 

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