The sounder strobe remains the most commonly used alarm for fire evacuation system, for wall or ceiling applications, indoors.

The sounder strobe is intended for use in addressable, 2-wire systems where the individual address of each device is written inside the MCU’s EEPROM by the addressable programmer.

The system designer must make sure that the total current drawn by the devices on the loop does not exceed the current capability of the panel supply, and that the last device on the circuit is operated within its rated voltage.

When calculating the voltage available to the last device, it is necessary to consider the voltage drop due to the resistance of the wire. The thicker the wire, the smaller the voltage drops. Wire resistance tables can be obtained from electrical handbooks.