- Reaction score
- 1,345
My grandma has recently had mains smoke alarms fitted to her house by a local charity. The house is over 3 storeys. Each alarm is fed from the lighting circuit on that floor - i.e. all on different circuits, and the interconnect is a single plus cpc going between the alarms. I have never seen it done this way, normally I've seen alarms connected with 3core+earth. I suppose it may have been done so as not to lengthen one lighting circuit. Is it an acceptable way to do it?