There is also now a T2 SPD in the consumer unit in between the upfront 300 mA RCD and the 30 mA RCBOs, but I cannot see that has any bearing on things.
There is also now a T2 SPD in the consumer unit in between the upfront 300 mA RCD and the 30 mA RCBOs, but I cannot see that has any bearing on things.
well if there is a surge, ever so briefly that SPD will look like a low impedance until the surge has passed- it could, just about, if you had a single wire surge, say an over voltage on L but not N or the other way about create an LE path that would fire the front end RCD but not the RCBOs, but it is a bit of a stretch .
