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Light sockets

Former Community Member
Former Community Member
Something that has puzzled me for years.


Bayonet cap and Edison screw light bulbs can be removed without tools thus exposing potentially live terminals and presenting a distinct shock hazard.  made worse by the fact that you often need to stand on a chair to remove the bulb.   There are millions of these installed yet the regs seem quite happy with the situation.
  • 0
    Not the car 'BNC'  the connector was named the BNC (for Bayonet Neill–Concelman) after its bayonet mount locking mechanism and its inventors, Paul Neill and Carl Concelman. (He is the C of C connector fame as well)

    M.

  • 0

    .

    One problem with lampholders is that if the bulb fails it is not always obvious whether or not the holder is live.  Especially if it has two way switching..






    With the table and desk lamps it’s usually fairly obvious how to ensure the lamp can be replaced safely, simply unplug them.


  • 0
    dcbwhaley:


     


    I was sent on a training course for the PAT.  Which was boring but not as boring as testing brand new IEC leads.

     






    You could have failed the exam on purpose, like many school caretakers do to get out of having to do it.


  • 0
    In a house where I once lived there were circular, surface mounted light switches. One could simply unscrew the cover and reveal live parts.


    Does anyone remember those "Clix" two-pin plugs? No tools required! The cover unscewed. The pins slid up and the bare wire was inserted in loops at the top of the pins. The pins were pushed down and the cover replaced, tightening onto the pin tops to secure the connections.


    Some things have improved.
  • 0
    Those are MHV connectors Mike, I have used them at 3 kV, no problems of contact but fiddly to fit.
  • Former Community Member
    0 Former Community Member
    I doubt I could have held my job as  a senior design engineer if I couldn't pas the PAT exaM :-)
  • 0
    Dennis i have some of those cute little 2 pin clix plugs they are doing sterling service for plugging in my colored lamps in my disco room. They fit into a 2 pin 3 way adaptor. I can hear the elf and safety brigade having kittens now Lol
  • 0
    Kelly Marie Angel:

    Dennis i have some of those cute little 2 pin clix plugs they are doing sterling service for plugging in my colored lamps in my disco room. They fit into a 2 pin 3 way adaptor. I can hear the elf and safety brigade having kittens now Lol


    It's nice to know there are still some around, Kelly. I chucked the last of mine away years ago. However I still have a couple of ancient Christmas tree lighting sets with BC adaptors (that's how they were sold in those days). The plug into a BC 2-way adaptor.


    (BC adaptor?  What's that, Grandad?)


  • 0


    Can you use an Edison screw in a bayonet socket? (just google Bulb with PIR Inside)


    Socket: Bayonet cap (BC) [B22] male to Edison screw (ES) [E27] female. This adaptor allows you to use a Edison screw light bulb in a bayonet lamp socket. Easy and simple to use; no need to change fittings. Just plug in original fitting and attach the light bulb

    I bought a couple of these at a local British supermarket because German supermarkets in this country nearly all have a pile of unbought Edison screw type bulbs for sale. Anyhow the ES type I wanted had a internal PIR , very good and it worked when you walked into a shed no need for a switch on and off, worked with the cat as well going in and out.  However you could insert the bayonet end the wrong way around which leave the edison screw live and my experements showed that when you screw out the bulb a few exposed threads are live before it disconnects ,(it was inserted the wrong way around in the BC lampholder)


    www.google.com/search GBGB863GB863&oq=bulb+with+pir+inside&aqs=chrome..69i57.15976j0j7&sourceid=chrome&ie=UTF-8

    jcm



  • 0
    I attended a NAPIT “code breaker” session at an exhibition a little before C19 hit us. They showed a series of PowerPoint pics and asked the audience to ascribe a code to what they saw. One was a pendant hanging from a ceiling rose where some 25mm of the inner cores of the pendant were exposed. As far as NAPIT was concerned, the situation was worthy of a Code 2 as it was potentially dangerous. So I asked, what Mr Whaley asked in his OP. A little flustered, the presenter parried with the contention that the lamp holder, which was minus lamp, complied with BS7671 2018 so therefore could not be considered dangerous. I countered with a personal experience of 3 separate incidents where ordinary persons had received a significant shock from the contacts of lamp holders. None were reported and I suspect that is the case for most such occurrences. So no evidence of issues allows this anomaly to persist.

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