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Discuss Another socket puzzle: Why the extra terminal? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    Here's an old accessory made to BS1363. You can connect it to a ring and plug 13A plugs into it. What is the fourth terminal for?

    I've blanked off some text moulded into the bakelite so as not to give too many hints at first. Nothing else is hidden.

    4 terminal socket.jpg
     
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  2. Michael Sands
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    Michael Sands Regular EF Member

    Location:
    Scotland
    You need to stop biting your fingernails
     
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  3. littlespark
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    littlespark Electrician's Arms

    Location:
    Scottish Borders
    Some form of switch?
    The socket is energised only when there’s power to that terminal, lower current than the ring?

    Just a guess
     
  4. Timbo
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    Timbo Regular EF Member

    Location:
    Sussex
    Business Name:
    TechFix Services
    Is that a fused output?
     
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  5. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    Yes. What for?
     
  6. Spoon
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    Spoon Forum Mentor

    Location:
    Lancashire
    You might be onto something there, as the cable hole size is smaller than the others..
     
  7. SJD
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    SJD Forum Mentor

    Location:
    Braccan heal
    Fused output for e.g. a round pin lighting socket?
     
  8. anthonybragg
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    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    I was going to go for clean earth?
     
  9. littlespark
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    littlespark Electrician's Arms

    Location:
    Scottish Borders
    Ah... 13a socket and a 5 amp on the same plate... for all the old lamps that people had plugged in
     
  10. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    Surely the point of BS1363 was that all appliances had the same plug, eliminating other kinds of socket? A lighting point controlled by a wall switch, fed by the lighting circuit, might reasonably use a round pin socket to avoid other appliances being connected. But this is off the ring, so why not use more 13A sockets?
     
  11. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
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    What's a a clean earth?
     
  12. littlespark
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    littlespark Electrician's Arms

    Location:
    Scottish Borders
    One with no polluting human beings on it
     
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  13. telectrix
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    telectrix Scouser and Proud of It Respected Member

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    deleted, need more beer.
     
  14. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Show us the front then.
     
  15. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    I ripped chunks off both thumbnails ages ago using them as emergency screwdrivers, but my hands have taken such a beating with working round the clock for months that all my finger tips are basically worn through the skin and the nails worn and split. I was even contemplating wearing gloves which I hate!
     
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