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  • In a 3-Pin Plug, one pin is larger than the rest. Why?

    K@RTHIK

    Member

    Updated: Oct 26, 2024
    Views: 1.1K
    in a 3plug pin why one pin is designed larger than the rest,any reason for this!
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Replies

  • pikachu1994

    Member • Aug 27, 2012

    the reasons are (1) that it has to operate the safety shutters fitted to the corresponding socket outlet, enabling the line and neutral pins to enter the socket, and (2) it ensures that the appliance is always earthed before it is energised and de-energised before being unearthed.
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  • Saandeep Sreerambatla

    Member • Aug 28, 2012

    Normal terms the big one is for earthing!
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  • pikachu1994

    Member • Aug 28, 2012

    if it is wrong please correct me
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  • sndgpr26

    Member • Aug 28, 2012

    pikachu1994
    the reasons are (1) that it has to operate the safety shutters fitted to the corresponding socket outlet, enabling the line and neutral pins to enter the socket, and (2) it ensures that the appliance is always earthed before it is energised and de-energised before being unearthed.
    these two reasons may not justify because it can be done by keeping the third plug of same size also.
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  • [Prototype]

    Member • Aug 29, 2012

    Its just kept bigger to explicitly distinguish it as a Ground so you don't plug it incorrectly.

    [​IMG]
    (Sorry I am not very good in drawing & things, so bear with this)

    You see, you're supposed to plug-in A = GND, B = live/neutral, C= live/neutral. If both A, B & C are of same size, what's there to stop me from pluggin A = live/neutral, B=GND or any other way than it should be? You would say it idiotic to plug that way, but such mistakes do happen since humans are involved & sometimes, the curiosity bugs bite hard as well.😛
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  • naveee

    Member • Aug 29, 2012

    why earthing is needded ?????👎
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  • naveee

    Member • Aug 29, 2012

    sndgpr26
    these two reasons may not justify because it can be done by keeping the third plug of same size also.
    y earthing is need???
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  • naveee

    Member • Aug 29, 2012

    can anyone explain me y earthing is need ????
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  • [Prototype]

    Member • Aug 29, 2012

    naveee
    can anyone explain me y earthing is need ????
    Current always flows in the path having lowest resistance from higher potential to lower potential. Take a case where you've a device with a metallic body & a live getting shorted with it. Now, if there is no ground connected to the body of the device & you touch it, you know what's gonna happen. Here, you'll be the path having lowest resistance connected to the lower potential aka the earth.
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  • naveee

    Member • Aug 29, 2012

    [Prototype]
    Current always flows in the path having lowest resistance from higher potential to lower potential. Take a case where you've a device with a metallic body & a live getting shorted with it. Now, if there is no ground connected to the body of the device & you touch it, you know what's gonna happen. Here, you'll be the path having lowest resistance connected to the lower potential aka the earth.
    this implies only to a device having metallic bodies..... ?????
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  • Jeffrey Arulraj

    Member • Aug 29, 2012

    if you are not yet sure your body offers a resistance of about a mega ohm if there is an alternative path having lesser resistance then you are safe else i don't want to say

    a continuation of @[protype]'s post
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  • Jeffrey Arulraj

    Member • Aug 29, 2012

    naveee
    this implies only to a device having metallic bodies..... ?????
    not so all devices have some resistance but if that is higher than your body you are at a greater risk

    in general that is the reason all devices have metal bodies
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  • [Prototype]

    Member • Aug 29, 2012

    naveee
    this implies only to a device having metallic bodies..... ?????
    Not at all, but its highly expected in the devices having metallic body. You cannot estimate the number of ways you can get in contact with the live. A cut in a wire, a breakage in device exposing internal parts, handling with wet hands & the list never ends...
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  • naveee

    Member • Aug 29, 2012

    another..... a two pin plug wire which has a cut in a wire.... if get in to the contact of tht wire will i be eltrocuted????
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  • naveee

    Member • Aug 29, 2012

    [Prototype]
    Not at all, but its highly expected in the devices having metallic body. You cannot estimate the number of ways you can get in contact with the live. A cut in a wire, a breakage in device exposing internal parts, handling with wet hands & the list never ends...
    since a two pin plug wire which has a cut in a wire.... if get in to the contact of tht wire will i be eltrocuted???? ....becoz two pin wont hav a earth ???? conection ?
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  • [Prototype]

    Member • Aug 29, 2012

    naveee
    since a two pin plug wire which has a cut in a wire.... if get in to the contact of tht wire will i be eltrocuted???? ....becoz two pin wont hav a earth ???? conection ?
    BINGO! Provided you didn't wear any shoes & touching the ground with bare foot, or not lying such a way that some of your bare body part is touching the wall.
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  • naveee

    Member • Aug 29, 2012

    wat is the diff between transistor and radio ??????
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  • [Prototype]

    Member • Aug 29, 2012

    naveee
    wat is the diff between transistor and radio ??????
    Prefer creating your own thread with doubts that are not related to the topic of this thread. You'll be served better that way & others will also find it easily if they have similar doubts.
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  • sndgpr26

    Member • Aug 29, 2012

    naveee
    y earthing is need???
    when the two wires get shorted
    and suddenly when you touch it you yourself will be the low resistance path for current to flow
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  • Jeffrey Arulraj

    Member • Aug 30, 2012

    [Prototype]
    BINGO! Provided you didn't wear any shoes & touching the ground with bare foot, or not lying such a way that some of your bare body part is touching the wall.
    this way of dying is not really cool for the pain and agony is too much better dont use shorted switches try to get them fixed and check the earth once in a while
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  • priya ts

    Member • Aug 30, 2012

    for the high safety of human,the earthpin is larger than others
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  • akshetty

    Member • Aug 30, 2012

    its safety & identify to earthing pin..
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  • nirwan19

    Member • Aug 30, 2012

    K@RTHIK
    in a 3plug pin why one pin is designed larger than the rest,any reason for this!
    In 3 pin plug .....
    1> we have 1 live , neutral and earth.
    2> Bigger one is for earth as you said.
    3> Why bigger ?:-
    Ans:- because earth is used to bypass the access current , at the time of any accident . we choose it bigger because it will have less resistance comparatively, So at the time of any accident , then that current will choose the path having low resistance , as you may now .
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  • naveee

    Member • Aug 31, 2012

    priya ts
    for the high safety of human,the earthpin is larger than others
    i thought it is for identification betwn phase nad neutral pin
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  • Naman Agarwal

    Member • Aug 31, 2012

    earthing is done just to provide a path to leakage current if it is there iin the circuit...
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  • Naman Agarwal

    Member • Oct 5, 2012

    3rd pin is larger because larger the area of cross section, lesser is the resistance and thats why leakage current will opt for this path to flow ...thats why 3rd pin is kept larger...
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  • Jeffrey Arulraj

    Member • Oct 6, 2012

    naman2511
    3rd pin is larger because larger the area of cross section, lesser is the resistance and thats why leakage current will opt for this path to flow ...thats why 3rd pin is kept larger...
    True to the part pal
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