New Code.

Imagine the power supply and isolation that would have to be put on an ethernet switch though.

Yes, you are correct. I didn’t think about it tripping. Some people might want an actual fire system in their house, instead of an integrated system.

Some people, meaning just us? lol.

https://www.youtube.com/watch?v=q77QWsVflLI https://www.youtube.com/watch?v=vwvxFJPga68

Here are examples of some other people.

Those appear to be in attached housing, apartments or dorms.

Yes, but these are not apartments dorms. One is a shared house, and the other some kind of house.

The other one’s a group home.

This is where NFPA clarifies the wordage, referring to a house as a “single-family dwelling”.

Although (for instance), local codes may have a smoke detector ordinance requiring detectors in all bedrooms and on all floors, they can’t actually enforce it. They wouldn’t be going into people’s homes (single-family dwelling) and making sure.

I have seen many, many halfassed installs where the panel was wired to a cut up extension cord, and then plugged into a receptacle. This defeats NFPA and UL standards, and I’ve seen, more than once, these get unplugged because someone doesn’t know what it’s for.

The alarms in the second video. Do they have varied pitches?

They are multi-tone, if that is what you are asking.

No, I mean can the pitches change. Like 9219s.