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Are USB sockets on wall outlets live all the time, even when the switch is off?



The 2019 Stack Overflow Developer Survey Results Are InCan I add a standard receptacle on a GFCI circuitHow do I shut off the power, so I can install a USB enabled electricity socket?Electricity passes through a bulb holder, even when the switch is offLegrand USB Outlet (USB socket dead after minimal use)Outdoor outlet tripping all other outlets when usedCurious “open ground” when using testers in seriesStrange one - Trip switch trips when switching off plugElectric shock through laptop case and LEDs stay dim but on when switch is offCapped off outlets and light switch wiring, now no power to half the houseTrying to add an outlet on other side of wall, 3 pairs of white/black wires and ground



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








5















I got a USB wall socket fitted. When it was installed, I tested the USB port with a tester with the switches off, but the USB outlet was live. Is this normal?










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  • 1





    Hello, and welcome to Home Improvement. It's hard to understand your question; would you edit it to clarify? (Some punctuation would be great...)

    – Daniel Griscom
    12 hours ago






  • 5





    Could you please provide the actual switch/outlet you used.

    – Ben
    10 hours ago











  • This can only be a UK question.

    – Harper
    2 hours ago

















5















I got a USB wall socket fitted. When it was installed, I tested the USB port with a tester with the switches off, but the USB outlet was live. Is this normal?










share|improve this question









New contributor




sean kelly is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.















  • 1





    Hello, and welcome to Home Improvement. It's hard to understand your question; would you edit it to clarify? (Some punctuation would be great...)

    – Daniel Griscom
    12 hours ago






  • 5





    Could you please provide the actual switch/outlet you used.

    – Ben
    10 hours ago











  • This can only be a UK question.

    – Harper
    2 hours ago













5












5








5








I got a USB wall socket fitted. When it was installed, I tested the USB port with a tester with the switches off, but the USB outlet was live. Is this normal?










share|improve this question









New contributor




sean kelly is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I got a USB wall socket fitted. When it was installed, I tested the USB port with a tester with the switches off, but the USB outlet was live. Is this normal?







electrical receptacle uk






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sean kelly is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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sean kelly is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 hours ago









manassehkatz

10.8k1440




10.8k1440






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asked 13 hours ago









sean kellysean kelly

262




262




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New contributor





sean kelly is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






sean kelly is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







  • 1





    Hello, and welcome to Home Improvement. It's hard to understand your question; would you edit it to clarify? (Some punctuation would be great...)

    – Daniel Griscom
    12 hours ago






  • 5





    Could you please provide the actual switch/outlet you used.

    – Ben
    10 hours ago











  • This can only be a UK question.

    – Harper
    2 hours ago












  • 1





    Hello, and welcome to Home Improvement. It's hard to understand your question; would you edit it to clarify? (Some punctuation would be great...)

    – Daniel Griscom
    12 hours ago






  • 5





    Could you please provide the actual switch/outlet you used.

    – Ben
    10 hours ago











  • This can only be a UK question.

    – Harper
    2 hours ago







1




1





Hello, and welcome to Home Improvement. It's hard to understand your question; would you edit it to clarify? (Some punctuation would be great...)

– Daniel Griscom
12 hours ago





Hello, and welcome to Home Improvement. It's hard to understand your question; would you edit it to clarify? (Some punctuation would be great...)

– Daniel Griscom
12 hours ago




5




5





Could you please provide the actual switch/outlet you used.

– Ben
10 hours ago





Could you please provide the actual switch/outlet you used.

– Ben
10 hours ago













This can only be a UK question.

– Harper
2 hours ago





This can only be a UK question.

– Harper
2 hours ago










2 Answers
2






active

oldest

votes


















24














In the US, no the USB ports will not have power when the outlet is not powered. Most outlets in the US don't have power switches on them, so if you switch them off there is no way for power to be provided.
US typical USB outlet



In the UK, outlets often have power switches. In that case, your USB ports are usually powered while the outlet switches are off. This is because the outlet assembly itself is always powered, but the switches only control the outlet and not the USB power transformer.



    UK typical USB outlet



You said cheers in your original post, so I'm assuming you're probably British and have the UK type of USB outlet. Yes, this is normal.



Other answers are assuming that you are in the US, where that wouldn't be normal.






share|improve this answer
































    4














    Sometimes power supplies/transformers can hold voltage in capacitors to make it look like they are on for a short time after they are unplugged. Rather than checking with a tester, plug a phone (or anything that actually consumes power) into the charger and operate the switch to see if it is still on when the switch is off.



    It's not impossible for the USB portion to have power all the time, but I've never seen a USB receptacle that would allow for it in the US.



    edit: UK outlets can have integrated switches where this is much more plausible. See the other answer for the UK...






    share|improve this answer




















    • 1





      I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

      – chasly from UK
      6 hours ago






    • 1





      @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

      – JPhi1618
      6 hours ago











    Your Answer








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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    24














    In the US, no the USB ports will not have power when the outlet is not powered. Most outlets in the US don't have power switches on them, so if you switch them off there is no way for power to be provided.
    US typical USB outlet



    In the UK, outlets often have power switches. In that case, your USB ports are usually powered while the outlet switches are off. This is because the outlet assembly itself is always powered, but the switches only control the outlet and not the USB power transformer.



        UK typical USB outlet



    You said cheers in your original post, so I'm assuming you're probably British and have the UK type of USB outlet. Yes, this is normal.



    Other answers are assuming that you are in the US, where that wouldn't be normal.






    share|improve this answer





























      24














      In the US, no the USB ports will not have power when the outlet is not powered. Most outlets in the US don't have power switches on them, so if you switch them off there is no way for power to be provided.
      US typical USB outlet



      In the UK, outlets often have power switches. In that case, your USB ports are usually powered while the outlet switches are off. This is because the outlet assembly itself is always powered, but the switches only control the outlet and not the USB power transformer.



          UK typical USB outlet



      You said cheers in your original post, so I'm assuming you're probably British and have the UK type of USB outlet. Yes, this is normal.



      Other answers are assuming that you are in the US, where that wouldn't be normal.






      share|improve this answer



























        24












        24








        24







        In the US, no the USB ports will not have power when the outlet is not powered. Most outlets in the US don't have power switches on them, so if you switch them off there is no way for power to be provided.
        US typical USB outlet



        In the UK, outlets often have power switches. In that case, your USB ports are usually powered while the outlet switches are off. This is because the outlet assembly itself is always powered, but the switches only control the outlet and not the USB power transformer.



            UK typical USB outlet



        You said cheers in your original post, so I'm assuming you're probably British and have the UK type of USB outlet. Yes, this is normal.



        Other answers are assuming that you are in the US, where that wouldn't be normal.






        share|improve this answer















        In the US, no the USB ports will not have power when the outlet is not powered. Most outlets in the US don't have power switches on them, so if you switch them off there is no way for power to be provided.
        US typical USB outlet



        In the UK, outlets often have power switches. In that case, your USB ports are usually powered while the outlet switches are off. This is because the outlet assembly itself is always powered, but the switches only control the outlet and not the USB power transformer.



            UK typical USB outlet



        You said cheers in your original post, so I'm assuming you're probably British and have the UK type of USB outlet. Yes, this is normal.



        Other answers are assuming that you are in the US, where that wouldn't be normal.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 1 hour ago









        Brock Adams

        2,22821527




        2,22821527










        answered 11 hours ago









        DotesDotes

        2,585314




        2,585314























            4














            Sometimes power supplies/transformers can hold voltage in capacitors to make it look like they are on for a short time after they are unplugged. Rather than checking with a tester, plug a phone (or anything that actually consumes power) into the charger and operate the switch to see if it is still on when the switch is off.



            It's not impossible for the USB portion to have power all the time, but I've never seen a USB receptacle that would allow for it in the US.



            edit: UK outlets can have integrated switches where this is much more plausible. See the other answer for the UK...






            share|improve this answer




















            • 1





              I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

              – chasly from UK
              6 hours ago






            • 1





              @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

              – JPhi1618
              6 hours ago















            4














            Sometimes power supplies/transformers can hold voltage in capacitors to make it look like they are on for a short time after they are unplugged. Rather than checking with a tester, plug a phone (or anything that actually consumes power) into the charger and operate the switch to see if it is still on when the switch is off.



            It's not impossible for the USB portion to have power all the time, but I've never seen a USB receptacle that would allow for it in the US.



            edit: UK outlets can have integrated switches where this is much more plausible. See the other answer for the UK...






            share|improve this answer




















            • 1





              I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

              – chasly from UK
              6 hours ago






            • 1





              @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

              – JPhi1618
              6 hours ago













            4












            4








            4







            Sometimes power supplies/transformers can hold voltage in capacitors to make it look like they are on for a short time after they are unplugged. Rather than checking with a tester, plug a phone (or anything that actually consumes power) into the charger and operate the switch to see if it is still on when the switch is off.



            It's not impossible for the USB portion to have power all the time, but I've never seen a USB receptacle that would allow for it in the US.



            edit: UK outlets can have integrated switches where this is much more plausible. See the other answer for the UK...






            share|improve this answer















            Sometimes power supplies/transformers can hold voltage in capacitors to make it look like they are on for a short time after they are unplugged. Rather than checking with a tester, plug a phone (or anything that actually consumes power) into the charger and operate the switch to see if it is still on when the switch is off.



            It's not impossible for the USB portion to have power all the time, but I've never seen a USB receptacle that would allow for it in the US.



            edit: UK outlets can have integrated switches where this is much more plausible. See the other answer for the UK...







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited 6 hours ago

























            answered 13 hours ago









            JPhi1618JPhi1618

            10.9k22548




            10.9k22548







            • 1





              I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

              – chasly from UK
              6 hours ago






            • 1





              @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

              – JPhi1618
              6 hours ago












            • 1





              I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

              – chasly from UK
              6 hours ago






            • 1





              @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

              – JPhi1618
              6 hours ago







            1




            1





            I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

            – chasly from UK
            6 hours ago





            I have the British type as shown in Dotes' answer. I'm trying the experiment and so far it is charging my phone perfectly well with both switches off. I'll look in a few minutes but I'm pretty sure no capacitors are doing the charging.

            – chasly from UK
            6 hours ago




            1




            1





            @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

            – JPhi1618
            6 hours ago





            @chaslyfromUK, that makes sense. Our receptacles are different in the US and don't have integrated switches like that so it would be hard for this to happen. The UK based answer is right, but I'm leaving this answer because it can explain why voltages or small led lights stay on even after a charger is unplugged or switched off.

            – JPhi1618
            6 hours ago










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