ECS Device Installation 151455
4-27
4.5.2 Wiring to a FACP
See Figure 4-38 to properly wire the ECS-INT50W to the FACP.
The Internal Amplifier must be powered by a NAC programmed as Constant Auxiliary Power. Refer to
the FACP installation manual.
Figure 4-38 Wiring the ECS-INT50W to the FACP
4.5.3 VBUS Wiring
The VBUS is an analog voice bus that carries the recorded voice messages from the ECS-VCM to the
ECS-INT50Ws, or the voice messages generated from a system microphone to the ECS-INT50W.
The maximum resistance on the VBUS is 20Ω.
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