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Interconnect units within a single family residence only. Otherwise all households will experience unwanted alarms when you test any unit in the series. Interconnected units will only work if they are wired to compatible units and all requirements are met. The wiring shall be in accordance with the provision of Articles 210 and 3003 (B) of the National Electrical Code, ANSI/NFPA 70. The resistance of the interconnecting wiring shall be a maximum of 10 ohms. This unit is designed to be compatible