problem with pirs,

[underpar12]

hi can anyone help , just been called to luxury 4 storey flats.the problem is the internal staircase lights,there is 4 floors with 4 p,i,r, sensors and 30 lights in the staircase.any pir turns on all lights from any floor it has a overide swich grid and a emergency grid switch. all pir have been changed within the last 16, months. the problem is the lights are on permanentley, have checked grid switches there ok,have disconnected all pirs,turned all times down.connected one pir up at a time still on permantley,should i start dropping light fittings know to see and check switch wire is not touching the perm live

 

[Sparky Ninja]

Are the lights on on all floors? Are they on the same circuit via a contactor? Is there an independent grid switch on each floor?

Are the pir sensor operating as the only switch or is there a bypass for each floor?




Trying to understand the setup as much as I can.

 

[underpar12]

yes all lights on all floors,all on one circuit,there is one overide grid only.

 

[Spudnik]

Had the same prob a few months back.

In the end i gave up and just renewed all the PIR's and that cured it.

Never been back since

 

[Sparky Ninja]

So you bypassed all of the pirs and they remain on constantly?

 

[Deleted member 9648]

Disconnect and remove all known PIR's and overide switches and see if they stay on then....if they do there is either another control device/switch you dont know about or a wiring fault.

 

[underpar12]

yes disconnected all pir and overide is off.