In the late sixties and seventies low voltage switching was popular in very high end housing because it could be used top control multiple areas or zones. One low voltage switch could be used to start a sequential relay control motor so that as it slowly turned, it would activate relay contacts that were in parallel with the normally open switches that controlled a specific room or light. I serviced a large estate in the mid seventies that had an extensive low voltage switching system. From a touch of three switches next to their bed, the home owner would start a sequence that would turn on every interior and exterior light in their home and on their entire estate. These were some very high profile people and they didn’t mind spending the money as they felt they needed the extra security. The system was comprised of at least 4 motorized zone controllers and at least 100 relays. Quite impressive for the day.
Regards………….Elec N Spec
