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
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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
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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
New contributor
|
show 8 more comments
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
New contributor
2
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
2 days ago
8
Could you please provide the actual switch/outlet you used.
– Ben
2 days ago
4
This can only be a UK question.
– Harper
2 days ago
4
@Harper How can you be so sure? From what I can tell, "outlet" is quite an unusual word in the UK.
– Wilson
yesterday
3
I'm surprised a question with so little background information has 12 upvotes already!
– Bort
yesterday
|
show 8 more comments
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
New contributor
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
electrical receptacle uk
New contributor
New contributor
edited 2 days ago
manassehkatz
10.9k1440
10.9k1440
New contributor
asked 2 days ago
sean kellysean kelly
6413
6413
New contributor
New contributor
2
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
2 days ago
8
Could you please provide the actual switch/outlet you used.
– Ben
2 days ago
4
This can only be a UK question.
– Harper
2 days ago
4
@Harper How can you be so sure? From what I can tell, "outlet" is quite an unusual word in the UK.
– Wilson
yesterday
3
I'm surprised a question with so little background information has 12 upvotes already!
– Bort
yesterday
|
show 8 more comments
2
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
2 days ago
8
Could you please provide the actual switch/outlet you used.
– Ben
2 days ago
4
This can only be a UK question.
– Harper
2 days ago
4
@Harper How can you be so sure? From what I can tell, "outlet" is quite an unusual word in the UK.
– Wilson
yesterday
3
I'm surprised a question with so little background information has 12 upvotes already!
– Bort
yesterday
2
2
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
2 days 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
2 days ago
8
8
Could you please provide the actual switch/outlet you used.
– Ben
2 days ago
Could you please provide the actual switch/outlet you used.
– Ben
2 days ago
4
4
This can only be a UK question.
– Harper
2 days ago
This can only be a UK question.
– Harper
2 days ago
4
4
@Harper How can you be so sure? From what I can tell, "outlet" is quite an unusual word in the UK.
– Wilson
yesterday
@Harper How can you be so sure? From what I can tell, "outlet" is quite an unusual word in the UK.
– Wilson
yesterday
3
3
I'm surprised a question with so little background information has 12 upvotes already!
– Bort
yesterday
I'm surprised a question with so little background information has 12 upvotes already!
– Bort
yesterday
|
show 8 more comments
2 Answers
2
active
oldest
votes
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.
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.
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.
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
2
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
1
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
1
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
2
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
|
show 3 more comments
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...
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
2 days 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
2 days ago
2
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
add a comment |
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2 Answers
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2 Answers
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active
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votes
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.
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.
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.
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
2
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
1
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
1
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
2
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
|
show 3 more comments
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.
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.
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.
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
2
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
1
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
1
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
2
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
|
show 3 more comments
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.
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.
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.
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.
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.
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.
edited yesterday
Brock Adams
2,22821527
2,22821527
answered 2 days ago
DotesDotes
2,735414
2,735414
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
2
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
1
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
1
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
2
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
|
show 3 more comments
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
2
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
1
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
1
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
2
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
Unless the entire outlet is on a switched spur. where switching off the spur would turn off the USB (and the outlets regardless of the switches on the outlet)
– ratchet freak
yesterday
2
2
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
That's a correct description of the UK situation. I've just removed one and while it was off the wall I measured the power consumption of the USB charger: 2W with nothing plugged in and the switches off
– Chris H
yesterday
1
1
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
@Rich exactly, it takes some power to even know whether there's anything there to charge. The maximum output of the one pictured would be about 15W (mine 10W). That's one of the reasons I took mine out, and I don't like having stuff I can't turn off easily.
– Chris H
yesterday
1
1
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
@ChrisH thanks for the explanation. It's a shame there isn't a physical switch to control the USB ports, either like the ones for the plugs or one that is activated by something being inserted into the USB socket.
– Rich
yesterday
2
2
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
@Rich you and I would prefer a switch, but it adds cost and I guess many people want the convenience of just plugging in the USB. I doubt you could switch the mains side with something operated by inserting a plug, because mains switches require a certain amount of material and therefore force to be robust enough, but switching the 5V side by insertion wouldn't help as the power supply would be idling as it is now.
– Chris H
yesterday
|
show 3 more comments
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...
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
2 days 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
2 days ago
2
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
add a comment |
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...
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
2 days 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
2 days ago
2
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
add a comment |
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...
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...
edited 2 days ago
answered 2 days ago
JPhi1618JPhi1618
11k22548
11k22548
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
2 days 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
2 days ago
2
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
add a comment |
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
2 days 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
2 days ago
2
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
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
2 days 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
2 days 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
2 days 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
2 days ago
2
2
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
Update - Yes, completely charged my phone from 80% to 100% while mains sockets switched off.
– chasly from UK
yesterday
add a comment |
sean kelly is a new contributor. Be nice, and check out our Code of Conduct.
sean kelly is a new contributor. Be nice, and check out our Code of Conduct.
sean kelly is a new contributor. Be nice, and check out our Code of Conduct.
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-electrical, receptacle, uk
2
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
2 days ago
8
Could you please provide the actual switch/outlet you used.
– Ben
2 days ago
4
This can only be a UK question.
– Harper
2 days ago
4
@Harper How can you be so sure? From what I can tell, "outlet" is quite an unusual word in the UK.
– Wilson
yesterday
3
I'm surprised a question with so little background information has 12 upvotes already!
– Bort
yesterday