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24 VDC Power Wiring
The 70Vrms Speaker Circuit Interface Card requires 24 VDC regulated and power-limited power from the “Host” fire
alarm control panel or from an ANSI/UL Listed power supply. Wire 24 VDC from the “Host” fire alarm control panel
or an ANSI/UL Listed power supply to terminals 0V and +24V of the 70Vrms Speaker Circuit Interface Card [0V =
negative, +24V = positive] (see figure 6).
Note: The power supply power to the 70Vrms Speaker Circuit Interface Card must be a 24 VDC ANSI/UL
Listed, regulated and power-limited supply.
Figure 4 – 70Vrms Speaker Circuit Interface Card, “Host” Class B Speaker Circuit Wiring
Figure 5 – 70Vrms Speaker Circuit Interface Card, “Host” Class A Speaker Circuit Wiring
