OP
nickblake
well ill be honest i always install them on their own circuit and use the EI ones where you need to remove the head to access the battery then if they do switch them off it bleeps and drives them mad so they switch them back on , but i must agree with connecting them to the lighting circuit as we used too ,and one thing i always do when i do a PIR is to test them with some canned smoke just to confirm they work or have not had the batteries taken out , and if they have no batteries they get some put in !!!
