That is only if your community has adopted the NFPA's recommendations as their building code, which most have not. NFPA's code has required interconnected smoke alarms since the 30's but most places still don't have them. For example, here in New York State, interconnected alarms are not required. However, a recent law went into effect banning the sale of detectors with replaceable batteries. All detectors sold in the state must contain a sealed, 10 year battery now. After 10 years, you replace the whole device rather than replacing the battery every year.
I just double checked....and the requirement is based on the power source of the building. If the building is serviced by a commercial or "on-site" power source, then hardwired, interconnected, battery backup alarms are required. But if the power source is not commercial or on-site, then they can be powered by batteries and are not required to be interconnected. Huh....that's interesting. More than I ever thought I wanted to know about smoke detectors in New York State.
Also, on-site power source? So, if you're running a nuclear reactor in your basement, better get those smoke detectors interconnected.
The Kiddie relay enables you to connect a wired fire alarm system to pretty much anything. Using what others did over on ST (luder888) I used his directions to modify a GoControl ZWave contact sensor to relay open/close of my wired fire alarm system to HE. HSM sees this as a smoke detector and HSM rules can be created with this method.
What you need:
Kiddie Relay SM120XGoControl ZWave Contact SensorDirections on hardware setup
Finally the driver:
Z-Wave Door/Window Sensor as Smoke Det…
But I am only see the capability for "Smoke Detector" not for "Carbon Monoxide"
AFAIK, there is no carbon monoxide detector capability. I think any z-wave or zigbee device that alarms for CO locally can only show up as a smoke alarm in ST, HE, etc. Not positive of that though, I’ve (thankfully) never actually had a CO alarm go off since I started using ST in 2015.
I have the Onelink wired that are interconnected via hard wire and they also interconnect wirelessly both of my detector circuits. I have too many smokes/pyro/Co devices for them all to be on one run. I wish they were connectable to HE. I believe the onelink devices are WiFi and BT.
Do you happen to know if the relay is needed for every smoke detector? I currently have Nests (which I will be pulling because google sucks for killing works with nest) and the only feature I will miss is the alert which tells you the room the alarm is going off in.