RCBO with Functional Earth Lead.

[ELECNEWT]

I have read somewhere, (but I can't locate the source), that because the RCBO's electronic control operates at a very slightly higher potential than earth, there is a very small leakage to earth through the functional earth lead.
Is this correct or is my memory playing tricks?

 

[telectrix]

it's real purpose is just to make our lives more difficult, trying to get that poxy thin wire end to make a good contact in the terminal with a hulking 6mm cpc on the shower circuit in the same hole.

 

[telectrix]

mornin' pete.