The Manuals have this Primary connection to Gnd (Item (F) in the diagram):
How is this different to the PE Gnd of AC In and AC Out1 and AC out 2?
In my case it’s for a house, and my house has it’s own ground spike (live and neutral are from the power company). Do I connect the primary Gnd, and PE Gnd of AC In/Out1/Out2 all two that Gnd spike? I.e. all 4 Gnds to the same point?
In the old forums there was a post that all ground connections are internally connected anyway.
IIRC, Main-reason that single screw is called “Main-Ground” is that you do not rely on PE from AC1 (could be shore, which disconnects) or any of the AC-Outs. (Could just be used as the PE for attached consumers)
PE of AC In and the chassis are bonded.
If you lose the grid the PE on AC out 1 is connected to chassis PE. AC out 2 is only powered when the grid is available.
So depending on how the unit is connected to your loads (grid parallel or inline) would determine if you need an additional chassis PE (in the case you couldn’t rely on the PE from AC In).
I use ACin and ACout1 and have connected PE to both of their PE terminals. I have left the PE connection of the Mutliplus-housing n.c. I think this is also in line with the Multipuls user manual:
The MultiPlus is a safety class I product (supplied with an earthing terminal for safety purposes). Its AC input and/or output terminals and/or earthing point on the outside of the product must be equipped with an an uninterruptible earthing point for safety purposes.
Note “and/or”
If you need to connect the housing to the earthing system highly depends on your local electrical code.
The earth connections on ACin and ACout are protective grounds, while the housing is connected trough a separate conductor, the functional ground. Its purpose is not to protect people from hazardous voltages in the event of an equipment failure, it is used to ensure that equipment complies with electromagnetic compatibility rules
According to the manual, at least the multiplus i just looked up, complies to a few of the IEC EMC standards 61000-x, so im going to go out on a limb and say that item F should not be denoted as a PE
which shouldn’t matter in the case of a normal detached house, should it? In other words, I think a PE connection to ACin and ACout is sufficient in such a case?
Your grid code tells you if it matters or not. Id say part of the reason why there are EMC rules is because there have been issues
