Rcbo???

[Kev2632]

Im scratching my head here at this, its probably because of the time off night but i cant get my head round this at all, here in the picture is a contactor for the outside lights, now this is one of many contactors throughout the building. there is contactors at each consumer but there is 1 Photocell controlling everything,so all the contactors was linked out to bring them in at the same time. Now every circuit is on its own RCBO, you will notice that they have joined all the neutrals in a connectore block, wouldnt that affect the RCBOS? as they are all coming from different circuits??

 

[Engineer54]

SO would all these RCBO's still be able to detect a borrowed neutral from another circuit, or will it not as the neutrals are all common to each other in this setup???

The neutrals are all common, there are no split DP zones on the system...

 

[Kev2632]

The neutrals are all common, there are no split DP zones on the system...

So then the RCBO's won't trip then borrowing neutrals from other circuits will it????
Thanks

 

[Engineer54]

Think about it, ....the neutral is common to all 3 phases, so the sensing circuit won't see any imbalance. You can have a whole 36 pole 3 phase board with all single or multi phase RCBO's protecting every circuit, ....no tripping!!!

 

[SimpleSimon]

No, but they're not borrowing neutrals. Just imagine in your head that all neutrals in that building are connected to one HUGE neutral bar. (even though you view it as different neutral bars in the building.) so each RCBO neutral fly lead after going through the electronics is connected to the same neutral zone regardless of different boards hence no inbalance no tripping

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