Sorry for the long delay in replying. However, I have to make sure I buy the correct equipment. My garden is for arguments sake a rectangle. each corner will have a security light with a fitted sensor. I will have 1.5 mm 3 core + earth in a paralell wiring configuration. That way any pir sensors on any of the lights should trigger them all at once as I will have run a live and switched live to L and L1 respectively. In theory I just need then to run the cable into a spur switch via an rcb. Would i need such a thing as the voltel single control unit as I will not be using external sesors in the loopas each fitted pir sensors are wired this way?
regards
Paul