Control of the luminaires is via a flex7 plug-in sensor head and switch, both operating at PELV. The luminaires are manually switched on with a short pulse of the switch, after which they remain on whilst movement is sensed. After the room is vacated the luminaires switch off when the timeout period has elapsed.
The use of flex7 control modules negate the need for RCD and/or earthed mechanical protection of the switch drop. Additionally, installation time is dramatically reduced as everything plugs-in, meaning only the 4 conductors at the Distribution Box require on-site termination.
Note: emergency luminaires are tested via a hard-wired 230V key switch, often located in close proximity to the distribution board.