synchronised wiring of a domestic home

[EddieB]

Hi Guys
A friend of mine's neighbour has just had a rewire of his house and every night his outside light comes on every few minutes and flashes on and off, she has asked him to sort it out and he says it'll be difficult as it's a "synchronised"system that's controlled from a device in the loft..... I've never heard of this has anybody else??

 

[Deleted account]

Hi Guys
A friend of mine's neighbour has just had a rewire of his house and every night his outside light comes on every few minutes and flashes on and off, she has asked him to sort it out and he says it'll be difficult as it's a "synchronised"system that's controlled from a device in the loft..... I've never heard of this has anybody else??

Difficult or not. He needs to sort it. And no I’ve never heard of this synchronised system.

 

[Mikegh]

Sounds like some of control device that's faulty or setup wrong

 

[westward10]

Does it only do it when dark.

 

[Mikegh]

What the hell would that be

Unless it's not that at all and it's just a standalone light trying to 'fire' so to speak

 

[James]

many Pir’s turn the output on for a few seconds on power up as a self test.
I suspect that the supply to the pir(s) is fed from either a central timer or a central dusk till dawn sensor.

so each of the parts are probably working as they should but the design of the system is poor and leads to the lights coming on briefly at dusk.

edit, just re read post, if this is happening every few minutes, it is simply not right.
I would be telling the spark that it doesn’t work correctly and difficult or not, they need to sort it out.

 

[westward10]

Could be a dawn to dusk sensor being interfered with by another light source or even the light source it is switching but without more info difficult to say.

 

[Mikegh]

many Pir’s turn the output on for a few seconds on power up as a self test.
I suspect that the supply to the pir(s) is fed from either a central timer or a central dusk till dawn sensor.

so each of the parts are probably working as they should but the design of the system is poor and leads to the lights coming on briefly at dusk.

edit, just re read post, if this is happening every few minutes, it is simply not right.
I would be telling the spark that it doesn’t work correctly and difficult or not, they need to sort it out.

Would that be common though timer + pir , would make sense your explanation then

Dusk to dawn and pir ? Doesn't pir already incorporate dusk to dawn , no ?

 

[James]

Yes I was thinking a common timer or dusk till dawn sensor feeding the pir(s)
most but not all outdoor pir have dusk till dawn sensors but they can normally be turned off.

 

[westward10]

You can incorporate a timer into the output of the sensor a lot of commercial sites do this to stop light pollution. A sensor will keep the lights on all night but using a timer can switch them off before dawn.