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House switch wires to USB? Possible?

post #1 of 8
Thread Starter 
Not sure were I could post a question like this but I figured this spot...

I want to mount a tablet on my wall above some regular light switches.
To charge the tablet, I wanted to tap into the house wires (that are going to the light switches) and use an adapter to convert it to a USB so I can charge the tablet behind the wall.

So almost like converting your regular 120v outlet to one of those USB outlets but I need this to happen behind the wall..

Any ideas?
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post #2 of 8
You could solder some 14 gauge solid wire to each of the pins on a usb charger, then heatshrink over them. Then just identify which wire nuts or screws on an outlet you need to attach the adapter to and you're done. There should be room for one of those tiny usb chargers in the wall box unless the original electricians were super messy or there are a lot of wires coming into the box.

Obviously turn the breaker off first lol. It can be done live but unless you're experienced and 100% comfortable with it, just shut off the breaker.
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post #3 of 8

In most places it's a requirement that any wiring connections are accessible with plates.  You would be best off installing a new electrical box above the light switches and one of the plugs you linked in the first post in there.

 

Now there is also the issue that sometimes power isn't actually going to the light switch, but instead the light switch is just connected to the light directly and switching one of the conductors.  If this is the case you wouldn't have a live and neutral in the light switch to feed the USB charger.

 

You did say it was multiple light switches though, so typically if it's multiple switches in one box, you will have power available that you can use to feed the new box in the wall for the new plug.

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post #4 of 8
Thread Starter 
Quote:
Originally Posted by axipher View Post

In most places it's a requirement that any wiring connections are accessible with plates.  You would be best off installing a new electrical box above the light switches and one of the plugs you linked in the first post in there.

Now there is also the issue that sometimes power isn't actually going to the light switch, but instead the light switch is just connected to the light directly and switching one of the conductors.  If this is the case you wouldn't have a live and neutral in the light switch to feed the USB charger.

You did say it was multiple light switches though, so typically if it's multiple switches in one box, you will have power available that you can use to feed the new box in the wall for the new plug.

Hmmm... Thanks for this feedback.
I didn't think about putting in a new box in the wall above the switches.
I was also thinking about what wires would be hot all the time also.
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post #5 of 8
That depends on your house wiring. You have have a hot in the box that is switched and sent to the light or you may have a hot coming from the light to be switched and returned. I am not sure about taking it from what comes from the light(one side would always be hot, but as for the code, I am unsure.).

Another box is a good idea for sure.
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post #6 of 8
Thread Starter 
Assuming I have a hot wires with a neutral - are there any slim wire to usb adapters that could fit inside a wall, someone could provide a link too?
I am not finding what I am looking for anywhere.
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post #7 of 8
Here in the uk they sell the front plates (wall mounted plug sockets) with usb ports included.
Do they do that in usa
post #8 of 8
Quote:
Originally Posted by dseg View Post

Assuming I have a hot wires with a neutral - are there any slim wire to usb adapters that could fit inside a wall, someone could provide a link too?
I am not finding what I am looking for anywhere.

 

Most likely you won't as any electrical connections in North American need to be accessible by simple removing a cover.  This is why you might see just plain blank cover plates along a wall sometimes, because a connection had to be made there and they can't just hide it behind the wall.

 

So because of this, there are laws that prevent the importing of electrical devices that don't meet these rules so most USB wall sockets are going to be like the one you linked in your first post which would either replace an existing plug in a wall box, or need a new wall box installed.

 

Unfortunately just like we can't talk about non-legal ways to aqcuire software, we really can't recommend devices that don't meet local building codes.  The last thing I would want is a 120 V down to 5 V USB charging adapter behind the wall that gets too hot one day and starts a fire because it wasn't certified by a proper safety organization.

 

 

Quote:
Originally Posted by richie_2010 View Post

Here in the uk they sell the front plates (wall mounted plug sockets) with usb ports included.
Do they do that in usa

 

Yes they do like the one he linked in the first post like this:

 

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