smokes(line voltage ones) are interconnected, but they are still in parallel. Smokes that are part of a FA system can be in series, but can also be parallel, depending on which set of contacts you use. Fire dept of building codes in your area is what I would use for placement.
Re: Smoke Detectors In Series#90770 12/10/0403:39 PM12/10/0403:39 PM
Line voltage smoke detectors for residential are interconnected with 14-3 wire and if one sounds they all will go into alarm.I use BRK and use photo electric type within 20 feet of a bathroom or kitchen and ionization elsewhere.We use the type with battery backup.
Put 1 on each level near stairwell and add a 2nd if the floor area is over 1200sq feet. Also put 1 in each bedroom. I put heat detectors in the garage and also in an attic with mechanical equipment.Keep 3 feet away from ventilation duct feed and returns.
Connect to a AFCI circuit according to 2002 NEC.
Do not use more than 12 smoke detectors interconnected.
Re: Smoke Detectors In Series#90771 12/10/0406:08 PM12/10/0406:08 PM
We are required to place one in each bedroom, and one immediatly outside each sleeping area. They are all required to be on the same circuit, a dedicated circuit, connected with 14/3. We use the red wire for the interconnect. Since some of them are inside the bedrooms, the circuit must be on an AFCI.
Re: Smoke Detectors In Series#90773 12/10/0406:47 PM12/10/0406:47 PM
the interconnect is in the 14-3(Red wire). Also, when placing detectors, be sure to not place them within 4" ( I beleive) of the corner of the room, where the ceiling meets the wall. The smoke can't get to them.
Re: Smoke Detectors In Series#90774 12/10/0408:22 PM12/10/0408:22 PM
we are required to install 1 on each floor level, 1 in each bedroom, and 1 in the hallway just outside of the bedrooms but if other bedrooms are not within 10' of that smoke you need to install another.. it is all up to the building inspector