You lose me when you say things that are as untrue as the manufacturers say about their products.
From what I have read from a French electrician they do in fact nuisance trip.
First off, where did you read that?
Like any sensitive equipment a RCD may trip on current imbalance, it isn?t a regular occurrence. Items with SMPS have an inherent leakage, too many on a circuit and they will trip just as a GFCI will.
Not what I have heard from UK sparkies on UK forums. Crack open a European RCD and its just a toroid coil with a solenoid. In terms of functionality an RCD is exactly like a GFCI, and if a GFCI is tripping than it is sensing a ground fault.
When RCD?s came out they were a bit temperamental, that?s 40+ years ago.
As you know from the other side, there?s usually an underlying fault causing the trip. Spurious tripping is very rare, electricians trying to find a get out is more common.
Now we use current ramp testing the actual time/current curve is recorded in situe for every RCD unit installed.
The RCD and RCBO?s in my flat were tested just before I moved in. A month ago I had an independent test carried out, the results were within 2% of the previous results.
The tests were carried out by someone you know Mr Brooke's ;-) He?s a stickler for the regulations.