Pir randomly switching on when light switched off

[nickblake]

Heres a puzzler , did re wire install an out side half lantern PIR light , when one of thelights on a lighting circuits is switched off the outside light comes on , im scratching my head all circuits are new and have tested out 100% , all i can think of is either induced voltages or mains spikes it very odd any i deas chaps as my brain has not slotted into gear yet

 

[rocker]

Is the one which you switch off a 2-way switch which the PIR light is wired into L2 for any reason?

 

[nickblake]

no unfortunatly , its on its own feed on the lighting circuit ,very odd just confused

 

[poirot]

Which light in the house is affecting the lantern?

 

[nickblake]

Its a lounge wall light , there is 9 lights on the circuit 3 lanterns 2 pendants 2 wall uplighters and a 28 watt 2 D dome light , the outside light is fed via switch feed so to reduce the number of cables in the light , but the switch is not connected its just straight through

 

[telectrix]

try a snubber across the PIR output. may help, esp if the PIR controlled lamp is low energy.