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What is the maximum distance I can run cable for an XBus system?

It is not recommended to exceed 125ft between thermostats.  For XBus systems, each CAT5 cable run can be no longer than 1,000ft in total with no more than 8 thermostats on a single CAT5 cable run.  It is highly recommended to use an NT-TB terminal board as a hub for your XBus thermostat cabling.  Each 'drive' (X1/X2) on a network controller can support up to 2,000ft and a maximum of 16 thermostats.  With each controller having two drives, up to 32 thermostats can be supported on up to 4,000ft of CAT5 cable.