I have an outside floodlight which is controlled by a PIR. It's fed from an FCU spurred off a ring main. The light sometimes comes on for a few seconds when other things on the same ring - e.g. Teasmaid (yes, ours is still going strong after more than 30 years!) are switched on or off. I'm familiar with PIRs coming on for a while when the mains is restored after an interruption, but not to them being affected by *other* things going on or off. I assume it's responding to some sort of noise (contact bounce etc.) being injected into the mains. Has anyone else come across this?
- posted
16 years ago