3 core and earth (brown, black, grey and non-insulated copper core). This is generally used as it allows for pir lighting to incorporate a permanent override which enables the light to remain on and by-passing the pir function.
3 core and earth (brown, black, grey and non-insulated copper core). This is generally used as it allows for pir lighting to incorporate a permanent override which enables the light to remain on and by-passing the pir function.