The APS-10A booster power supply main board receives a 120VAC 60Hz feed from a dedicated fifteen-amp circuit connected to its hot, neutral, and ground terminals. Two 12V 7Ah backup batteries connect in series to the board's battery terminals. NAC terminals one through four wire to a SIGA-CC1S module for audio-visual notification appliance circuit synchronization. Visible and audible sense circuits incorporate forty-seven-kilohm end-of-line resistors across their output and common terminals. A SIGA-CT1 module connects to the trouble relay terminals to monitor booster power supply trouble conditions.
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