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Embedded and Microcontrollers
Embedded Forum Low wattage 110v over 20-22AWG wire?
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Forum Thread Details
  • State Not Answered
  • Replies 13 replies
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  • wiring
  • nodemcu
Related

Low wattage 110v over 20-22AWG wire?

DanTheMan827
DanTheMan827 over 9 years ago

I bought a 5v power supply from china but the holes in the PCB for the AC voltage are extremely small (about 20-22AWG)

 

Is this safe to use with such a thin wire?

 

I mean, my measurements are just a guess but I did try some 18AWG stranded wire and it didn't fit through the hole... (almost)

 

Here's a spec sheet for the PSU http://shop.cpu.com.tw/product/48432/info/

 

I plan on stuffing a NodeMCU, relay, and this power supply into a single gang blue electrical box that will not be mounted inside the wall but instead would be something like an all-in-one powerswitch tail.

 

I plan to use as a Wi-Fi light switch for patio lighting (a series of 12V LED lights) which would be used in place of an existing wall-mounted timer.

 

I was thinking of wiring it up something like this, the 110VAC coming in would be a recycled PC power cord.

 

FlaUmey.png

 

Since it will be inside a electrical box the branch of 110V to the 5v psu would be very short.

 

I would use a wire nut for the neutral wires which would be the light wire, PSU neutral, and the neutral from the outlet

 

Then for the hot it would be the same but the light wire would be passing through the relay instead.

 

Also, would I safely be able to remove some strands of from a thicker wire to fit it through the PCB hole?

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  • gdstew
    gdstew over 9 years ago +1
    As long as the wire insulation is rated above the AC voltage (usually 300V) and the current used by the LED strip is below what 20 - 22 gauge wire is rated for which is 5A (22 ga.) - 6A (20 ga.) for solid…
  • jw0752
    jw0752 over 9 years ago in reply to Jan Cumps +1
    I was just looking for reinforcements for the next time D_Hersey decides to invade Wisconsin with his profound rhetoric. Also Wausau is a really great place with lots to see. I used to go there once a…
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  • shabaz
    0 shabaz over 9 years ago

    I wouldn't trust such a $3 power supply anyway, and it might be violating legislation in your country anyway to do this. However if you do proceed (not advised), do make sure that the NodeMCU's USB port is not accessible to the outside world in case something goes wrong with your supply.

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  • shabaz
    0 shabaz over 9 years ago

    I wouldn't trust such a $3 power supply anyway, and it might be violating legislation in your country anyway to do this. However if you do proceed (not advised), do make sure that the NodeMCU's USB port is not accessible to the outside world in case something goes wrong with your supply.

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  • DanTheMan827
    0 DanTheMan827 over 9 years ago in reply to shabaz

    Are you referring to the power supply being illegal or placing the project into an electrical box?

     

    If it's the latter, the electrical box wouldn't be mounted inside the wall but rather used solely as a project box.

     

    As far as location, I'm in the United States — Wisconsin

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  • jw0752
    0 jw0752 over 9 years ago in reply to DanTheMan827

    Hi Daniel,

     

    Where in WI?

     

    John

    Chippewa Falls, WI

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  • DanTheMan827
    0 DanTheMan827 over 9 years ago in reply to jw0752

    Wausau, WI

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  • Jan Cumps
    0 Jan Cumps over 9 years ago in reply to DanTheMan827

    I'm expecting a group photo:

     

    There are 86.31 miles from Chippewa Falls to Wausau and 89.65 miles by car.

    Chippewa Falls and Wausau are 1 hour 25 mins far apart (by car).

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  • jw0752
    0 jw0752 over 9 years ago in reply to Jan Cumps

    I was just looking for reinforcements for the next time D_Hersey decides to invade Wisconsin with his profound rhetoric.

     

    Also

     

    Wausau is a really great place with lots to see. I used to go there once a week when I was repairing dental equipment for a living.

     

    John

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