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Discuss Does a TP&N RCB work if not connected correctly? in the Commercial Electrical Talk area at ElectrciansForums.co.uk.

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  1. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    I'm not being stupid here. Not correctly, as in, not as the labels on the device says

    So, the situation is, I have a TP&N distribution board with a regular 125A 4 pole mainswitch. The terminals serve in order- N, L1, L2, L3 with the neutral on the left.
    This installation is to have a 300mA RCD mainswitch fitted.
    The manufacturer of the distribution board can supply the RCD, but the connections are marked 1,3,5,N on top and 2,4,6,N on bottom. ie, the neutral is on the right of the switch module.

    The paperwork with the RCD says that the load and supply can be reversed.. ie, fit the thing upside down, but that's not going to look great.

    It also says that the RCD can work as a 2 pole device using 1-2 (not 3-4 and 5-6)and the N, and these can be reversed. (putting live into the N terminal, and neutral on the 1-2 poles)
    If so, can I do it this way and still use the other 2 phases in the middle terminals?

    I have already asked the manufacturer for their technical advice and await their reply. You lot are much quicker.

    How does a TP&N RCD work and will it work if I connect it up the way I need to?
    Will I need to add a new enclosure before the board with the RCD in it, with the cables in the right positions?
    I know the answer to this one, but can I ask the fairies to pull the fuses and i'll put the rcd in place of the suppliers isolator

    I'll post photos of the equipment when I have some. My description isn't too clear now I've read it over.
     
  2. buzzlightyear
    Offline

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    who's board is it?
     
  3. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders

    Its Contactum Defender B
    Seems a bit daft to make a board that you cant swap out mainswitches when you need to.
     
  4. buzzlightyear
    Offline

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
  5. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
  6. Matthewd29
    Offline

    Matthewd29 Regular EF Member

    Location:
    Belfast
    Board design changed last year alone with order or main switch connections as I had the same issue. Did your wholesaler sell you an older board?
     
  7. spinlondon
    Online

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    As far as I’m aware, with TP&N RCDs, all conductors pass through the coil.
    As long as they’re in balance the RCD doesn’t operate.
    As such, it should not matter which way round the conductors are connected.
     
  8. Lucien Nunes
    Offline

    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    The RCD operation itself, as far as detecting imbalance, should work any which way. But if the contacts are sequenced, it is important on a TP+N system that the neutral is connected to the N pole of the device, so that the lines are never connected without it.
     
  9. spinlondon
    Online

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    Was thinking simultaneous operation due to the manufacturer’s stating the device can be used for double pole operation, with the neutral in either pole.
     
  10. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    Hmm. Conflicting opinions there.
    Still waiting for contactum technical to get back to me.
    In the meantime, a photograph of the RCD itself. Hard to see the terminal markings, but you can see the schematic diagram if you zoom in.
    2611AA61-9985-45B9-AF79-52C7ED45E2F3.jpeg

    I’m thinking it doesn’t matter, but I don’t want to test the theory without a little back up.
     
  11. telectrix
    Offline

    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    as long as contrectum email you that it's OK, your arse is covered.
     
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