What are these holes for on this travel adaptor?












6















I have a standard European travel adaptor. What are the two holes on the top and bottom for?



image






europe power







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    6















    I have a standard European travel adaptor. What are the two holes on the top and bottom for?



    image






    europe power







    share|improve this question



























      6












      6








      6








      I have a standard European travel adaptor. What are the two holes on the top and bottom for?



      image






      europe power







      share|improve this question
















      I have a standard European travel adaptor. What are the two holes on the top and bottom for?



      image






      europe power




      europe power






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 7 hours ago







      D Manokhin

















      asked 8 hours ago









      D ManokhinD Manokhin

      98224




      98224






















          4 Answers
          4






          active

          oldest

          votes


















          12














          All the middle holes are there for accepting various types of ground (earth) pins.



          Specifically, the top two holes are there for British plugs (BS 546, BS 1363), while the bottom two are there for Brazilian, Danish and Swiss plugs. As always, Wikipedia has the gory details:



          https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets






          share|improve this answer



















          • 4





            The lower part of the upper hope looks like it would accept a US plug.

            – phoog
            7 hours ago











          • Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

            – phoog
            5 hours ago








          • 1





            If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

            – Henning Makholm
            4 hours ago













          • It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

            – David Richerby
            3 hours ago



















          4














          Your adapter is designed to acept a wide range of plug types, unfortunately this also tends to mean it accepts none of them well. The "for export only" label doesn't inspire confidence either.



          The holes you have circled in red are to accept the earth pins of the aforementioned wide variety of different plug types. Exactly what is hard to tell from the photo but I'm pretty sure at least UK, US and Australian plugs are supported by that hole combination.



          Depending on just how crappy the adapter in question is you may or may not find it actually provides an earth connection between the Earth contacts on the Schuko style plug and the earth pin holes in the socket.






          share|improve this answer



















          • 1





            proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

            – dlatikay
            6 hours ago













          • @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

            – user29850
            5 hours ago











          • The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

            – trognanders
            4 hours ago








          • 3





            Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

            – Peter Green
            4 hours ago











          • This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

            – Peter M
            38 mins ago



















          2














          Various grounding pins.



          Check Wikipedia on plugs and sockets, to see the variation.



          I guess it makes a lot of sense to place the holes similar to what people are used to, and as far as I remember from that list (it's been a while since I spend hours reading through it), all plugs have the grounding pin placed symmetrically in relation to the live pins. And that has resulted in that layout.






          share|improve this answer































            0














            That is not a standard socket. That is entirely an invention of the Chinese junk sellers.



            It has not been approved by any competent testing laboratory, and it definitely never will. This type of socket is simply trying to adapt too many kinds of plugs, at the expense of safety, and it would not be able to be listed even if it was made by a competent builder. As such, the junk sellers don't even try to make a safe product. Hence the "for export only" sticker: export it to a jurisdiction we're not responsible for.



            Use a listed adapter made for your specific plug-socket pair.



            Note that CE is not the mark of a reputable testing agency. UL, CSA, TUV, SGS, NTL, ETL are.



            Hazards of cheapie multi-plug adapter by Big Clive



            John Ward on these... And his teardown.






            share|improve this answer

























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              4 Answers
              4






              active

              oldest

              votes








              4 Answers
              4






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              12














              All the middle holes are there for accepting various types of ground (earth) pins.



              Specifically, the top two holes are there for British plugs (BS 546, BS 1363), while the bottom two are there for Brazilian, Danish and Swiss plugs. As always, Wikipedia has the gory details:



              https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets






              share|improve this answer



















              • 4





                The lower part of the upper hope looks like it would accept a US plug.

                – phoog
                7 hours ago











              • Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

                – phoog
                5 hours ago








              • 1





                If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

                – Henning Makholm
                4 hours ago













              • It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

                – David Richerby
                3 hours ago
















              12














              All the middle holes are there for accepting various types of ground (earth) pins.



              Specifically, the top two holes are there for British plugs (BS 546, BS 1363), while the bottom two are there for Brazilian, Danish and Swiss plugs. As always, Wikipedia has the gory details:



              https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets






              share|improve this answer



















              • 4





                The lower part of the upper hope looks like it would accept a US plug.

                – phoog
                7 hours ago











              • Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

                – phoog
                5 hours ago








              • 1





                If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

                – Henning Makholm
                4 hours ago













              • It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

                – David Richerby
                3 hours ago














              12












              12








              12







              All the middle holes are there for accepting various types of ground (earth) pins.



              Specifically, the top two holes are there for British plugs (BS 546, BS 1363), while the bottom two are there for Brazilian, Danish and Swiss plugs. As always, Wikipedia has the gory details:



              https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets






              share|improve this answer













              All the middle holes are there for accepting various types of ground (earth) pins.



              Specifically, the top two holes are there for British plugs (BS 546, BS 1363), while the bottom two are there for Brazilian, Danish and Swiss plugs. As always, Wikipedia has the gory details:



              https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 7 hours ago









              jpatokaljpatokal

              114k17351513




              114k17351513








              • 4





                The lower part of the upper hope looks like it would accept a US plug.

                – phoog
                7 hours ago











              • Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

                – phoog
                5 hours ago








              • 1





                If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

                – Henning Makholm
                4 hours ago













              • It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

                – David Richerby
                3 hours ago














              • 4





                The lower part of the upper hope looks like it would accept a US plug.

                – phoog
                7 hours ago











              • Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

                – phoog
                5 hours ago








              • 1





                If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

                – Henning Makholm
                4 hours ago













              • It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

                – David Richerby
                3 hours ago








              4




              4





              The lower part of the upper hope looks like it would accept a US plug.

              – phoog
              7 hours ago





              The lower part of the upper hope looks like it would accept a US plug.

              – phoog
              7 hours ago













              Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

              – phoog
              5 hours ago







              Or the upper hole, rather. A grounded US plug is NEMA 5-15P. The ungrounded analog of that plug (NEMA 1-15P) lacks the pin that would go into the hole in question, but the blades would fit into the inner part of the outer holes on the bottom of the image.

              – phoog
              5 hours ago






              1




              1





              If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

              – Henning Makholm
              4 hours ago







              If this adapter accepts a Danish grounded plug, the ground pin would surely go in one of the top two holes, probably the topmost.

              – Henning Makholm
              4 hours ago















              It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

              – David Richerby
              3 hours ago





              It's not entirely accurate to decribe BS546 plugs as "British". Obviously, it is a British standard but these plugs have been obsolete in the UK for decades. A friend of mine had to use them in a university hall of residence 25 years ago and they were staggeringly anachronistic even then. They are used in various other countries, though.

              – David Richerby
              3 hours ago













              4














              Your adapter is designed to acept a wide range of plug types, unfortunately this also tends to mean it accepts none of them well. The "for export only" label doesn't inspire confidence either.



              The holes you have circled in red are to accept the earth pins of the aforementioned wide variety of different plug types. Exactly what is hard to tell from the photo but I'm pretty sure at least UK, US and Australian plugs are supported by that hole combination.



              Depending on just how crappy the adapter in question is you may or may not find it actually provides an earth connection between the Earth contacts on the Schuko style plug and the earth pin holes in the socket.






              share|improve this answer



















              • 1





                proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

                – dlatikay
                6 hours ago













              • @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

                – user29850
                5 hours ago











              • The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

                – trognanders
                4 hours ago








              • 3





                Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

                – Peter Green
                4 hours ago











              • This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

                – Peter M
                38 mins ago
















              4














              Your adapter is designed to acept a wide range of plug types, unfortunately this also tends to mean it accepts none of them well. The "for export only" label doesn't inspire confidence either.



              The holes you have circled in red are to accept the earth pins of the aforementioned wide variety of different plug types. Exactly what is hard to tell from the photo but I'm pretty sure at least UK, US and Australian plugs are supported by that hole combination.



              Depending on just how crappy the adapter in question is you may or may not find it actually provides an earth connection between the Earth contacts on the Schuko style plug and the earth pin holes in the socket.






              share|improve this answer



















              • 1





                proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

                – dlatikay
                6 hours ago













              • @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

                – user29850
                5 hours ago











              • The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

                – trognanders
                4 hours ago








              • 3





                Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

                – Peter Green
                4 hours ago











              • This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

                – Peter M
                38 mins ago














              4












              4








              4







              Your adapter is designed to acept a wide range of plug types, unfortunately this also tends to mean it accepts none of them well. The "for export only" label doesn't inspire confidence either.



              The holes you have circled in red are to accept the earth pins of the aforementioned wide variety of different plug types. Exactly what is hard to tell from the photo but I'm pretty sure at least UK, US and Australian plugs are supported by that hole combination.



              Depending on just how crappy the adapter in question is you may or may not find it actually provides an earth connection between the Earth contacts on the Schuko style plug and the earth pin holes in the socket.






              share|improve this answer













              Your adapter is designed to acept a wide range of plug types, unfortunately this also tends to mean it accepts none of them well. The "for export only" label doesn't inspire confidence either.



              The holes you have circled in red are to accept the earth pins of the aforementioned wide variety of different plug types. Exactly what is hard to tell from the photo but I'm pretty sure at least UK, US and Australian plugs are supported by that hole combination.



              Depending on just how crappy the adapter in question is you may or may not find it actually provides an earth connection between the Earth contacts on the Schuko style plug and the earth pin holes in the socket.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 7 hours ago









              Peter GreenPeter Green

              5,3801326




              5,3801326








              • 1





                proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

                – dlatikay
                6 hours ago













              • @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

                – user29850
                5 hours ago











              • The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

                – trognanders
                4 hours ago








              • 3





                Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

                – Peter Green
                4 hours ago











              • This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

                – Peter M
                38 mins ago














              • 1





                proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

                – dlatikay
                6 hours ago













              • @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

                – user29850
                5 hours ago











              • The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

                – trognanders
                4 hours ago








              • 3





                Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

                – Peter Green
                4 hours ago











              • This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

                – Peter M
                38 mins ago








              1




              1





              proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

              – dlatikay
              6 hours ago







              proper British sockets have a mechanical lock that prevents anything from being inserted into the live and neutral before the (longer) grounding prong makes contact. this is probably absent here too.

              – dlatikay
              6 hours ago















              @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

              – user29850
              5 hours ago





              @dlatikay Of course it's absent - otherwise US, EU and other plugs wouldn't activate the shutters.

              – user29850
              5 hours ago













              The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

              – trognanders
              4 hours ago







              The plug into the outlet side of the adapter does not have an earth ground prong, so this is definitely circumventing grounding. Plugging a device with a grounded plug into a non-grounded outlet is always unsafe, regardless of adapter quality.

              – trognanders
              4 hours ago






              3




              3





              Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

              – Peter Green
              4 hours ago





              Schuko style plugs don't use a pin for earthing, they use side contacts. Those side contacts appear to be present on the OPs adapter, whether they are actually connected properly is another matter of course.

              – Peter Green
              4 hours ago













              This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

              – Peter M
              38 mins ago





              This would not suit Australian plugs. The power and neutral in Australian plugs are flat and at an angle. This adapter doesn't look it supports that geometry. And that is without going on about how bad the earth hole looks like.

              – Peter M
              38 mins ago











              2














              Various grounding pins.



              Check Wikipedia on plugs and sockets, to see the variation.



              I guess it makes a lot of sense to place the holes similar to what people are used to, and as far as I remember from that list (it's been a while since I spend hours reading through it), all plugs have the grounding pin placed symmetrically in relation to the live pins. And that has resulted in that layout.






              share|improve this answer




























                2














                Various grounding pins.



                Check Wikipedia on plugs and sockets, to see the variation.



                I guess it makes a lot of sense to place the holes similar to what people are used to, and as far as I remember from that list (it's been a while since I spend hours reading through it), all plugs have the grounding pin placed symmetrically in relation to the live pins. And that has resulted in that layout.






                share|improve this answer


























                  2












                  2








                  2







                  Various grounding pins.



                  Check Wikipedia on plugs and sockets, to see the variation.



                  I guess it makes a lot of sense to place the holes similar to what people are used to, and as far as I remember from that list (it's been a while since I spend hours reading through it), all plugs have the grounding pin placed symmetrically in relation to the live pins. And that has resulted in that layout.






                  share|improve this answer













                  Various grounding pins.



                  Check Wikipedia on plugs and sockets, to see the variation.



                  I guess it makes a lot of sense to place the holes similar to what people are used to, and as far as I remember from that list (it's been a while since I spend hours reading through it), all plugs have the grounding pin placed symmetrically in relation to the live pins. And that has resulted in that layout.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 7 hours ago









                  HenrikHenrik

                  2,3991415




                  2,3991415























                      0














                      That is not a standard socket. That is entirely an invention of the Chinese junk sellers.



                      It has not been approved by any competent testing laboratory, and it definitely never will. This type of socket is simply trying to adapt too many kinds of plugs, at the expense of safety, and it would not be able to be listed even if it was made by a competent builder. As such, the junk sellers don't even try to make a safe product. Hence the "for export only" sticker: export it to a jurisdiction we're not responsible for.



                      Use a listed adapter made for your specific plug-socket pair.



                      Note that CE is not the mark of a reputable testing agency. UL, CSA, TUV, SGS, NTL, ETL are.



                      Hazards of cheapie multi-plug adapter by Big Clive



                      John Ward on these... And his teardown.






                      share|improve this answer






























                        0














                        That is not a standard socket. That is entirely an invention of the Chinese junk sellers.



                        It has not been approved by any competent testing laboratory, and it definitely never will. This type of socket is simply trying to adapt too many kinds of plugs, at the expense of safety, and it would not be able to be listed even if it was made by a competent builder. As such, the junk sellers don't even try to make a safe product. Hence the "for export only" sticker: export it to a jurisdiction we're not responsible for.



                        Use a listed adapter made for your specific plug-socket pair.



                        Note that CE is not the mark of a reputable testing agency. UL, CSA, TUV, SGS, NTL, ETL are.



                        Hazards of cheapie multi-plug adapter by Big Clive



                        John Ward on these... And his teardown.






                        share|improve this answer




























                          0












                          0








                          0







                          That is not a standard socket. That is entirely an invention of the Chinese junk sellers.



                          It has not been approved by any competent testing laboratory, and it definitely never will. This type of socket is simply trying to adapt too many kinds of plugs, at the expense of safety, and it would not be able to be listed even if it was made by a competent builder. As such, the junk sellers don't even try to make a safe product. Hence the "for export only" sticker: export it to a jurisdiction we're not responsible for.



                          Use a listed adapter made for your specific plug-socket pair.



                          Note that CE is not the mark of a reputable testing agency. UL, CSA, TUV, SGS, NTL, ETL are.



                          Hazards of cheapie multi-plug adapter by Big Clive



                          John Ward on these... And his teardown.






                          share|improve this answer















                          That is not a standard socket. That is entirely an invention of the Chinese junk sellers.



                          It has not been approved by any competent testing laboratory, and it definitely never will. This type of socket is simply trying to adapt too many kinds of plugs, at the expense of safety, and it would not be able to be listed even if it was made by a competent builder. As such, the junk sellers don't even try to make a safe product. Hence the "for export only" sticker: export it to a jurisdiction we're not responsible for.



                          Use a listed adapter made for your specific plug-socket pair.



                          Note that CE is not the mark of a reputable testing agency. UL, CSA, TUV, SGS, NTL, ETL are.



                          Hazards of cheapie multi-plug adapter by Big Clive



                          John Ward on these... And his teardown.







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