Another multiplus RCD/GFCI question

[B51-technician (Alfredo)]

Hello @victronitnerd , I think we discussed your topic here in that post:

Earth/neutral bonding with multiplus

Hello @ShallowAl . Interesting question Cascading RCDs requires at least the right RCD types in terms of current and trigger delay. In the diagram attached (sorry for the german text, source ABB), you see a main RCD (in your words, the upstream RCD) and a cascaded RCD. The two curves and its areas should never interfere to avoid a double release. That’s the general part of the story from my point of view. Main RCDs as first ones in the cascade are “S” types (selective). I…

In a nutshell, cascading RCDs requires the right RCD types at the right position - in terms of current and trigger delay. Main RCDs, as first ones in the cascade, need to be “S” types (selective).