These drawings show how to install Fire Alarm Break Glass (BG) or Manual Call Point (MCP) on walls. It has to be mounted on back box installed in the wall. This box (embedded or exposed as specified in the concerned section of the specification) has to be connected through GI / PVC conduit that will have the Firetuff or equivalent cable to be looped for other detectors.
The DC power supply shall consist of batteries and batteries charger.
Batteries of DC Power Supply - Technical Specifications
The batteries shall be nickel cadmium type with pocket plates type range TP, T.