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Hardwiring the Nest Cam Outdoor

My house is new construction and has a low voltage hardwire in place for a security camera. I want to wire the Nest Cam Outdoor to this hardwire. Any thoughts on how it should be spliced and attached. Could I just cut the USB cable and attach the power wires directly to the house hardwiring?

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Does the nest cam allow PoE (power over Ethernet) using a cat 5 cable if I cut it?


Hi @nish,

Not quite sure what you want to do.

The Nest Cam Outdoor and Indoor use WiFi to send the video, not ethernet, (according to the specs anyway).

Also the camera only requires 5V DC 1A to operate so you would have to take that into account.


@jayeff - I am currently wiring my entire house with cat and low voltage for TV, data and phone. I was debating if I should go with CCTV security system and set up exterior camera using cat 5 or do the exterior nest can and find a way to hook them up to an outlet. If I do the nest cam, I have to fish the wire from the outside and then have the electrician out an outlet on the inside of the house so I can plug it in. Just trying to find a cleaner way to use the Nest cam if I don't go with the CCTV system. Thoughts or suggestions?


Hi @nish,

Just some thoughts and some things to consider:

1. distance and gauge of power cable feed, therefore power supply required.

2. location of camera re WiFi interference if any

3. concerns regarding warranty.

Are all the house Cat 5 cables going back to a patch panel type arrangement? If so then perhaps there is a power outlet available nearby and you could use a direct feed to the camera without splicing, by 'replacing' the camera cable entirely and powering it from the patch panel connection (not sure if cat 5 connector can handle the current though- perhaps a different type connector mounted on it which fits connector from replacement DC adapter which will probably be needed. Alternatively run low voltage cable back to 'patch panel -if that's what you are having and use the calculator in the answer below to work out the cable losses and then what power supply you need. Be sure that you get the polarity correct as I don't know if the camera has reverse voltage protection.

I don't know if the outdoor unit opens the same way as the indoor unit and what this would do to its' waterproof integrity (assuming it has some) and naturally it will void the warranty (splicing the cable most probably will anyway)

With regard to interference just make sure that the camera, if possible, is not near a power meter box or outdoor A/C unit etc to minimize EMI.

I don't know if you saw these answers but they might give you some ideas.

If not get back here with with what arrangements you are having, cable gauges etc and distances etc.

Extend Nest Outdoor Camera power cable?

Cut and repair the power cable to the outside nest cam?


You might be able to try a USB repeater. Looks like it's not very cost effective, though.


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Hi @johnmilk

If you are going to splice into the power cable between the camera and the adapter and then connect it to the low voltage hardwire to where you want it you will want to take the following points below into consideration. (The power run then could be from the Power outlet to the adapter, out of the adapter via the USB plug end of cable which is cut and spliced into the hardwire. At the other end of the hardwire, connect to the end of the cut cable which is still connected into camera. Where you cut the cable from the camera to the USB plug would be determined on local requirements as to distance etc from hardwire cable point and also power adapter location distance to hardwire location. The above is also assuming that the house hardwire that you are using is isolated from the rest of the house low voltage wiring if this is what you meant and you are only using it as a convenient way to get to the desired location..

1. Ensure that the polarity of the connection is correct.i.e. That the +ve output wire from the power adapter is connected to the positive input wire of the camera via the low voltage hardwire and the -ve output wire from the power adapter is connected to the negative input wire of the camera via the low voltage hardwire.

In other words the red wire in the spliced camera cable connects to the same colour wire in the hardwire cable at both ends and the black wire connects to the other colour wire in the hardwire cable at both ends. I do not know if the camera has reverse voltage protection or not so it is important to get it right as a reversed connection could possibly damage the camera.

2. If you have problems with the camera's display or even that it doesn't work after installation it may be because that due to the extra distance involved in the power supply feed path that there is not enough voltage being supplied to the camera for it to function correctly.

Here are the power requirements of the camera. camera specs (Scroll down to Tech Specs and click on see more)

AC adapter input: 100-240V AC, 50/60Hz, 0.2A

AC adapter output: 5V DC, 1.4A

Camera input: 5V DC, 1.0A

''An example ''of what I mean is as follows.

If the cable distance from the power adapter to the camera is 30' then the actual distance for the power is 60'. (Return loop path distance)

Using 18 gauge wire as the wire thickness of the hardwire and assuming it is the same for the Nest Cam cable the resistance of the cable is .383 Ohms. cable resistance calculator Using Ohms law the voltage drop across the cable when 1A of current is needed is (E=IR) 0.383V DC. The camera needs 5V to work correctly but it will only get 4.617V because of the cable losses. I do not know if this is sufficient for the camera to operate correctly or not.

If it doesn't work properly and you have more than the 2 wires in the hardwire cable (hopefully you have 4 wires) then try connecting the red wire to two wires in the cable at both ends and the same with the black wire, connect it to the other two wires at both ends. That way the resistance will drop and therefore so will the voltage loss. It will drop to about .196V therefore the voltage available to the camera will increase to 4.804V which is closer to the 5V operating voltage of the camera.

The above as stated is an example, all I am really saying is that for the camera to operate correctly, given that you may be introducing extra length to the designed power feed then you need to be aware of the factors which might affect performance, i.e. distance of power feed, gauge of power feed wire and supply voltage value.

Hopefully this is of some help.

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Puan 4

6 Yorum:

Hi @jayeff , You failed to say how splicing into the power adapter would Void Warranty.


Hi @lpfaff1

Thanks I missed that. Hopefully the OP would be aware of that. Caveat Emptor in regards to my advice ;-)



I had used the Monoprice USB Extender over CAT5E or CAT6 Connection up to 150ft. Cost about $10 on amazon. My front door camera works perfectly as the distance is shorter. However my backyard camera is not connecting and it's probably because of wifi. I noticed a drop of voltage in the backyard camera while the front yard cam did receive 5v needed.


Voltage drop is definitely a factor! Attempted to splice and use 60 feet of in-wall low voltage wire, 18/2 black/red stranded, and didn't get the camera to turn on. Measure at the source, 4.9v. Measured at the camera end 4.0v.


Hi Matt Mcclay,

If you want to still connect the camera use the maths formulas (insert own values) in the Chosen Answer in this link Extend Nest Outdoor Camera power cable? along with the cable resistance calculator to work out what power supply voltage is required to get the required voltage at the camera.

Apologies if you already know this.


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@johnmilk , John, The Nest Cam Outdoor is meant to be plugged into 110 volt plug, so no I would not recommend hooking up to low voltage wire, I believe minimum wire to use would be 14-2 gage wire and 110 v standard outlet. See below the installation manual for camera. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

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Hi @lpfaff1

I think he means splicing into the low voltage cable between the camera and the power adapter.

This is from the manual.

Use only the provided USB cable and power adapter.

These are the specs.

AC adapter input: 100-240V AC, 50/60Hz, 0.2A

AC adapter output: 5V DC, 1.4A

Camera input: 5V DC, 1.0A


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Try this. I built a new house and ran Cat6 everywhere thinking I would add a PoE camera. Found a few people saying this works.

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