This Emergency Voice Communication System label has been designed to satisfy the requirements of the British Standards as described below:
BS 5839-9:2021 Clause 13.1f)3) states…
Isolators and protective devices that can isolate the supply to the emergency voice communication system, other than the main isolator for the building and where in the case of any switch that disconnects the mains supply to both the EVC and to other circuits, should be labelled “WARNING. THIS SWITCH ALSO CONTROLS THE SUPPLY TO THE EMERGENCY VOICE COMMUNICATION SYSTEM”.