Fire Alarm Do Not Switch Off Label (Qty 18)
Self Adhesive Vinyl 49x25mm
As required by BS 5839-1 Clause 24.1.7 "Every isolator and protective device that can isolate the supply to the fire detection and fire alarm system, other than the main isolator for the building, should be labelled either:
a) “FIRE ALARM”, in the case of a protective device that serves only the fire alarm circuit, but incorporates no switch;
b) “FIRE ALARM. DO NOT SWITCH OFF”, in the case of a switch (whether incorporating a protective device or not) that serves only the fire alarm circuit; or
c) “WARNING. THIS SWITCH ALSO CONTROLS THE SUPPLY TO THE FIRE ALARM SYSTEM”, in the case of any switch that disconnects the mains supply to both the fire detection and fire alarm system and to other circuits."
 
Also see
 
BS 5839-1 Clause 35.4 "All joints, other than those within system components, should be enclosed within junction boxes, labelled with the words “FIRE ALARM” to avoid confusion with other services."