3phase Earth leakage and inverter

[Dylboy]

Hello : )

So now the second time I have seen this.

Basically the red and yellow phase supplies grid power to the non essentials, then the Blue is from the inverter.

However they have it all in 1 x 4 pole earth leakage.

You will see in the picture how there are now two neutral conductors at the top of the earth leakage as one is from Gris main neutral and the second is the neutral from the inverter.


So now basically it is one earth leakage for both grid and inverter supplies circuits and no splitting of neutral bars.


I am searching regs and annex P shows split neutral bars and all that. But that is informative and not normative.

Now I want to change this so the grid which is now a 2 phase be on the 4 pole ELU and then the inverter to have its own 2 pole.

What in the regs can help me motivate the change. I tried searching split neutrals and 6.12.4 popped up and it confused me a bit.

Also there is a bunch to do on the DB as you will see in the pic.

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[Dylboy]

Found what was looking for as the inverter only supplies part of the installation.

7.12.3.1.4 Where only part of an installation is switched to the alternative
supply in the same distribution board, the neutral bar shall be split (see
figures P.2 and P.3).

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