Question 1

My home has hard-wired interconnected smoke detectors. can i simply replace one with this device? i read that it doesn't use interconnect wire.

Accepted Answer

I think very few here understand the question. National code requires interconnected smoke detectors as of 2004, there is an extra wire in the circuit and all smoke detectors are on that wire for 'signal'. When one alarms they should ALL alarm. If I am reading the answers correctly, NEST does not comply with the signal wire. However, it looks like it does set up its own wireless network to act like they are all interconnected. To be honest, after paying for the extra wire behind the wall, why would I want to by 6-8 nests at $100 each when the originals are 20-30 each? This way there is one smart point to notify if any detector is going off. Nests way 6-9 smoke detectors, 6-8 login, 6-8 ip address. Ugh, what a nightmare!

Question 2

What happens if the wifi disconnects?  Does the alarm sound?

Accepted Answer

The Nest Protects and Nest Learning Thermostat create their own ad-hoc network and don't rely on your home wifi for communications between devices.  WiFi is only used for communications OUTSIDE of the home to pass on alerts, etc.  Even if the ad-hoc network fails the individual alarms will sound as they detect smoke/CO.

Question 3

Can you view carbon monoxide levels in PPM?

Accepted Answer

Yes, but only if you are connected to the internet and then only for the last ten days, and only if the level rises above the heads up level (which is 70ppm and rising for around an hour or a shorter period if over 150ppm).  To counter what someone else's answer was - Carbon monoxide does NOT sink.  It is in fact lighter than air (CO has an atomic weight of 28 versus Nitrogen (N2) which is also 28  - but marginally heavier (by 0.003 amu due to heavier isotopes), Oxygen (O2) which is 32 and Argon which is 40.  However the weight is similar enough in the air in your house that it tends to distribute as a fluid and is measurable anywhere in a room; it really depends upon how air moves through the space.  The levels tend to fluctuate rapidly as CO distributes and any outside air mixes in and additional CO is added.  Overall, there is no perfect way to measure the CO levels with one device in one place, but this is as good as most people need.

Question 4

Will these wired ones install on old electrical wired systems? The thermostat needed an additional wire installed. Will these, too?

Accepted Answer

Yes all the wired Nest Protect needs is the 120V hot (black) and neutral (white) wires in the electrical box connected to the plug-in pigtail that comes with the Protect.  If your house has multiple detectors now you will usually also find a red wire in the electrical box that interconnects your old detectors so that if one goes off they all sound.  That wire is no longer needed with the Protect so you just cap it with a wire nut.

ASIN	B00XV1RCRY
Alarm	Audible
Best Sellers Rank	#172,527 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #79 in Smoke & Carbon Monoxide Alarms
Brand	Google
Built-In Media	"Six long-life batteries (Energizer® Ultimate Lithium “L91” AA)
Color	White
Compatible Devices	Smartphone, Tablet
Customer Reviews	4.4 4.4 out of 5 stars (7,517)
Enclosure Material	Plastic,Stainless Steel
Global Trade Identification Number	00854448003679
Item Dimensions D x W x H	1.5"D x 5.3"W x 5.3"H
Item Type Name	Google Nest Protect, 2nd Generation, White, Battery
Item Weight	16 ounces
Manufacturer	Google Nest
Mfr Part Number	S3000BWES
Model Number	A11
Number of Items	1
Power Source	Battery Powered
Product Style	Battery
Sensor Type	Split-Spectrum Sensor
UPC	854448003679
Unit Count	1 Count
Upper Temperature Rating	100 °F

Google Nest Protect - Smoke Alarm - Smoke Detector and Carbon Monoxide Detector - Battery Operated , White - S3000BWES

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