9 Measuring, detecting, monitoring and controlling devices; sensors, detectors and monitoring instruments and apparatus; point sensors; optical fibre sensors; arc fault protection systems consisting of sensors and devices for detecting, recording and detecting arc faults as well as switching devices for the controlled switching off or extinguishing of arc faults; switches, electric; switchgear and switching devices for all voltages and all amperages; electrical and electronic devices for detecting, quenching and preventing the damaging effects of arc faults in electrical installations and distribution boards.