elecguy21 said:
Hi Can you tell me do smokes alarms and co in a 2 family if each apt. has to be connected together and the common areas, hall and cellar and the attic's smokes how do you connect those?. i'm unsure. All help welcomed.
210.25 prohibits branch circuits from one dwelling unit from being in another dwelling unit. This applies to smoke alarms, as well.
Common areas are also not permitted on the dwelling unit circuits and must receive their power from a "house" panel, etc. A "common" attic space which is accessible from a common location would have it's source power from the "house" panel. Same applies for cellar/basement if "common".
Think of compartmentalizing the wiring of each dwelling unit, as well as each common area.
Refer to applicable building code in effect within the jurisdiction the project is situated for the specifics on locations of alarms, detectors, etc.:smile: