I know I have seen an RCBO with an earth wire but not a clue why RCD's don't have them and neither do MCB's and today to find a v-ELCB would be hard they went out with the ark. I would be interested to find out why any RCBO requires an earth.
I bet Sparx has an answer?
1. The "functional earth" flying lead is the earth reference required in order to detect lost supply neutral; without this flying lead, the RCBO will not (adequately?) detect earth leakage unless the supply neutral is intact.
OK for a TN-C-S supply is the neutral is not intact then neither with the earth so I still can't see quite why it is there. Still looking!
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