Practically from the (very primitive) start, mains systems in private homes have
had switches to enable loads to be connected to or disconnected from the
electricity supply. With relatively few apparatus and lamps in the 'old' days, the
number of mains connections in each home was also quite small. That has
changed dramatically in the course of time. Not only the number of connections
has gone up considerably; ease of use has also become the prime requirement
for electrical appliances. Consequently, the need of an intelligent bus system for
automation purposes in buildings in on the rise.
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