How essential dust shutters on wall socket?

Discussion in 'Broadband' started by Eddie, May 3, 2009.

  1. Eddie

    Eddie Guest

    Is the dust really likely to cause problems for the electrical
    contacts if I remove the dust shutter on my socket, leave the
    socket empty for many months and then later put a plug n?

    Please don't ask why: it's too complicated to explain!

    I'm half hoping the shutter is present as a second level of dust
    protection because there might be some dust-removing capability
    built into the design of the plug and socket.

    Any experiences of this?

    Thank you for any info!
     
    Eddie, May 3, 2009
    #1
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  2. I believe the purpose of the shutter is electrical safety, not dust
    protection. Telephone line voltages are classified as Low Voltage,
    whereas what you would think of as low voltage is actually Extra Low
    Voltage. Telephone voltages are in the same class as mains electricity,
    and can peak at around 110 volts, even without worrying about mains
    earth faults.

    As I recall, telephone sockets had to bend the rules to be allowed at all.

    Note it is bad practice to post to newsgroup and its child.
     
    David Woolley, May 3, 2009
    #2
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  3. Eddie

    Graham Guest

    I agree the x-post to two groups was unnecessary, but I have
    never thought of u.t.b as inferior to u.t

    Interestingly, trailing extension-lead sockets rarely if ever
    have shutters, and they are more accessible to little fingers
    and even tongues!

    Unless the air is particularly contaminated with dust particles
    I think the OP is worrying too much.
     
    Graham, May 3, 2009
    #3
  4. Eddie

    Woody Guest

    Sorry Graham, wrong.

    Trailing socket outlets ALWAYS have shutters - IMSMC it is part
    of BS1363.
     
    Woody, May 3, 2009
    #4
  5. Eddie

    Graham. Guest

    Well non of the bog-standard extension leads I have here are shuttered.
    No doubt they are manufactured in the Far East, but they are widely
    on sale here from reputable sources and Supermarkets.
    Ditto for socket doublers etc.
    Ditto for ADSL filter/splitters.
     
    Graham., May 3, 2009
    #5
  6. I think that we are confusing two different items here! Mains sockets are
    always shuttered, telephone sockets are normally shuttered except extension
    cords. There is nothing dangerous about telephone line voltages - 50v DC
    line voltage and about 75volts AC ringing voltage BUT both at very low
    current, albeit ringing current can make you jump but it's certainly not
    dangerous.

    Peter
     
    Peter Andrews, May 3, 2009
    #6
  7. The 30mA used by earth leakage circuit breakers is a compromise. Even
    30mA could kill you.
    Or if there is a broken neutral on a PME mains distribution system.
     
    David Woolley, May 3, 2009
    #7
  8. Eddie

    Old Codger Guest

    I am not aware of any dust shutters for UK sockets. *All* UK 13A
    sockets have to be fitted with shutters that are released by the longer
    earth pin on the associated plug. You would have to take the socket to
    pieces to remove this shutter. Its purpose is safety, stopping little
    fingers inserting foreign matter into the live or neutral socket. It
    will not keep dust out.

    Perhaps you are thinking of the plastic child safety covers that can be
    purchased (plastic sheet with plastic pins attached matching 13A plug
    pins). Again, these are intended to be safety covers, nothing to do
    with preventing dust entering the socket, although they are likely to
    reduce the dust that does enter. Some experts consider these next to
    useless as a safety devices and some consider they actually reduce safety.

    --
    Old Codger
    e-mail use reply to field

    What matters in politics is not what happens, but what you can make
    people believe has happened. [Janet Daley 27/8/2003]
     
    Old Codger, May 3, 2009
    #8
  9. Eddie

    Abo Guest

    <confession>
    I wish I'd known that earlier, I just wired in an extension for someone
    and 'tested' the cable by sticking my tongue on the end...
    </confession>
     
    Abo, May 3, 2009
    #9
  10. Eddie

    Paulg0 Guest

  11. Eddie

    Petert Guest

    The shutters are there to prevent small, or not so small, children
    inserting thing such as pens, pencils or fingers into the sockets -
    hence the interlink with the earth socket.

    Probably best you don't remove the shutters in case of the above and
    if they have already been removed then I strongly suggest you have the
    sockets replaced.

    Your knowledge of domestic electrics is obviousl minimal so i would
    suggest that you don't dabble.
     
    Petert, May 3, 2009
    #11
  12. Eddie

    Petert Guest


    You seem to have either not read properly what the OP asked or read it
    and failed to understand - he was talking about mains sockets i.e.
    240V

    Alternatively I have misunderstood him, and he wasn't asking about
    mains sockets, but was asking about telephone sockets.


    There is of course a third alternative - he wasn't sure what he was
    talking about
     
    Petert, May 3, 2009
    #12
  13. Eddie

    Graham Guest

    The OP Eddie is referring to telephone sockets. Why would he
    post this in u.t and u.t.b if he was referring to mains sockets?
    Likewise, my comment about extension leads not being shuttered
    referred to telephone sockets.
    Now, with that in mind can someone explain why there is a
    discrepancy between the requirement for shuttering on wall-
    mounted telephone sockets and the apparent lack of the same
    requirement on extension leads and adapters?
     
    Graham, May 3, 2009
    #13
  14. Eddie

    J G Miller Guest

    J G Miller, May 4, 2009
    #14
  15. Eddie

    Phil W Lee Guest

    {pedant}
    Isn't it officialy 230V now?
    {/pedant}

    I think that would be off topic in telecom newsgroups.
    The implication is therefore that he was referring to telecom sockets,
    but his actual post isn't clear.
    It's probably safe to assume that telecom sockets are what is meant,
    as long as mention is made of that being the assumption.
    All things are possible, but in a telecom group, some are more likely
    than others.
     
    Phil W Lee, May 4, 2009
    #15
  16. Eddie

    Eeyore Guest

    Indeed. 42V peak and below is extra low voltage. Telephone lines sit at 48V.

    Ringing voltage.

    I'd say it's relevant to both. I have no trouble with that. I only read the
    broadband group so would have missed it otherwise.

    Graham
     
    Eeyore, May 4, 2009
    #16
  17. Eddie

    Petert Guest

    The OP Eddie may be referring to telephone sockets, but as there's
    been no sign of him replying to any of the follow-up posts we may
    never know
     
    Petert, May 4, 2009
    #17
  18. Eddie

    Graham. Guest

    Graham., May 4, 2009
    #18
  19. Eddie

    Graham. Guest

    Graham., May 4, 2009
    #19
  20. Eddie

    J G Miller Guest

    I do not think it would work too well for that purpose ;)

    But that plug is the "old" standard (gradually being replaced
    by RJ11) plug that is used in both the Netherlands and Belgium.

    The socket on the wall would look like this or similar --

    <http://www.samfund.COM/pics/n-4b.jpg>

    To use with standard RJ11 cables one merely connects a adaptor plug
    with a built in RJ11 socket into the above outlet.
     
    J G Miller, May 4, 2009
    #20
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