These requirements apply also to any remotely located power supplies that provide power to the fire alarm system. Typically, a larger system will need "boosters"This piece of equipment takes on many names, such as a "NAC panel" or "NAC power supply." The term "booster" comes from its function - the power supply "boosts" the power to the notification appliance circuit. In many systems, the main fire alarm control unit can't provide enough power to operate all of the appliances in the system. in the field to satisfy power supply requirements. These control the output to the notification appliances on the circuits they power, so they are also considered control units.
Also, the location of any remotely located power supplies must be indicated at the main fire alarm control unit. If so desired, and the main fire alarm control unit is capable, the unit display can be programmed to contain this information.