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Rcbo???

Discussion in 'Electrical Forum' started by Kev2632, Feb 17, 2012.

Discuss Rcbo??? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Kev2632
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    Kev2632 Regular EF Member

    fr_57_size880.jpg

    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??
     
  2. micknew
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    micknew Electrician's Arms

    Location:
    Kent
    Post deleted after reading again.
     
    Last edited: Feb 17, 2012
  3. JASON
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    JASON Electrician's Arms

    Location:
    Button Pressing
    Interesting.

    Surely it will only be the line's that go through the contactor?
     
  4. Kev2632
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    Kev2632 Regular EF Member

    Yea but what im meaning is you will see how they have all the neutrals joined together for the supplys and the control side of the contactor, but they are off different Circuits, so wont the RCBO trip as all the neutrals are connected together?
     
  5. Kev2632
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    Kev2632 Regular EF Member

    So it doesnt matter if other neutrals are joined together with each other then?? where as if it was say like a split load RCD board and the neutrals were all joined together it would trip wouldnt it?
     
  6. Plonker 3
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    Plonker 3 Guest

    Not when RCBOs are used they aren't.
     
  7. D80
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    D80 Guest

    What is the actual fault/problem?
     
  8. Kev2632
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    Kev2632 Regular EF Member


    Im just trying to get my head round it grr its late haha, but i keep comparing the RCBO'S to like a split load RCD Board, why is it that you can connect all the neutrals together like that on RCBO's but if i was do something like that with a split RCD board it would trip the RCD because it sharing neutrals from a different RCD's??
     
  9. Plonker 3
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    Plonker 3 Guest

    I think the problem here is that because it is controlled from a photocell everything switches on at the same time, so it is possible that the RCBO isnt sensing a imbalance in the conductors. The only time it would trip a RCBO is if there is something switched on and the other RCBO is receiving the neutral imbalance.
     
  10. nickblake
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    nickblake Trusted Advisor

    Looking at the Picture there only appears to be 2 wires going into the Contactor what you may have is a single RCBO supplying the contactor and multiple circuits going from the contactor to the lights hence the reason why all the neutrals are joined ,looking at the picture it looks like a 3 phase board with the tripple pole being marked L1L2L3 , looking at the contactor again it looks like just one of the contacts is being used , it may be me as i shouldnt have gone to specsavers , what can be done is a Day light sensor having a low current capacity using a Contactor with a higher current rating , or am i totally looking at the worng pic
     
  11. Geoffsd
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    Geoffsd Guest

    The final circuit neutrals will have to be separated.

    That's why they are connected to the top of the RCBOs and not to a neutral bar.
     
  12. Kev2632
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    Kev2632 Regular EF Member

    im having a stupid moment here to myself, sorry im not explaining myself properly

    there is no fault with this photo,

    All im trying too get my head round is, Why on RCBO can all the neutrals by connected together on the 1 neutral bar? wont the other RCBO see any imbalance from the other ones? because i know on a 240v Split load RCD board you cant share neutrals from other RCD'S so why can you connect all the neutrals together on RCBO'S?
     
  13. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    Being old and a little short of eagle eyed,I have difficulty seeing the detail in the picture
    i will make a comment though

    Are you sure its circuit neutrals that you believe you are seeing connector blocked ?
    Its probable the contactors are switching the lives only and what you are seeing is the coil feed and neutrals in and then out to the next contactor, all these fed from one circuit down the line
     
  14. Kev2632
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    Kev2632 Regular EF Member

    im having a stupid moment here to myself, sorry im not explaining myself properly

    there is no fault with this photo,

    All im trying too get my head round is, Why on RCBO can all the neutrals by connected together on the 1 neutral bar with there neutral lead? wont the other RCBO see any imbalance from the other ones? because i know on a 240v Split load RCD board you cant share neutrals from other RCD'S so why can you connect all the neutrals together on RCBO'S?
     
    Last edited: Feb 17, 2012
  15. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    The rcbos are likely to be single pole,the outgoing neutral will be the circuit load side
    The feed neutrals of the rcbos are looped at the neutral bar
    Where are you thinking that the neutrals are being grouped?

    The neutrals have to go through the rcbo to maintain balance
    If there are any parrallel paths for that neutral,it will imbalance
     
    Last edited: Feb 17, 2012
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