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Discuss BAFFLING smoke alarm problem in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

That's the standard pendant light, Swithed live, N, and loop,
I've jumped off the loop, N and earth

If the 'standard pendant' has been connected & wired by someone else, are you sure that has been correctly wired up? If not, and the sw L, lives, and neutrals have been mixed up, adding the loads (smokes), could present voltage at the neutral of the light when its switched on.

Edit; previously incorrectly wired/connected pendant, would still illuminate when switched on, even though incorrectly connected.
 
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If the only thing that has changed is the addition of the smoke alarms then the only way I can see that they would cause this operation is if they are connected in parallel with the switch, and therefore in series with the light.
When the switch is closed the smoke alarms will be shorted out and when the switch is open they will be in series with the light.
 
I've checked it, everything is correct
If the 'standard pendant' has been connected & wired by someone else, are you sure that has been correctly wired up? If not, and the sw L, lives, and neutrals have been mixed up, adding the loads (smokes), could present voltage at the neutral of the light when its switched on.
 
But the same would happen with only 1 detector connected, but it only happens when both are connected
If the only thing that has changed is the addition of the smoke alarms then the only way I can see that they would cause this operation is if they are connected in parallel with the switch, and therefore in series with the light.
When the switch is closed the smoke alarms will be shorted out and when the switch is open they will be in series with the light.
 
I don't know but I once wired a 2way and fitted LED lamps that wouldn't go off completely and changed the lamps to another make and all was fine I have also heard of cables run together getting enough power in them to make an energy saver glow ! The folk were convinced they had a ghost maybe it was so unless it's something like that or to do with your battery's in your alarms but like you said better not to guess but not being able to see it makes it harder to picture things. Just trying to think out of the box as your convinced your wiring is right !
 
But the same would happen with only 1 detector connected, but it only happens when both are connected

Not necessarily, as it's a compact fluorescent lamp it is not a simple resistive load. It will need a minimum voltage across it to illuminate.
With two alarms connected you have half of the resistance in series with the lamp
 

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