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Label the line feed wire with the number of the breaker.
Use a separate breaker f or powering the electronics.
This prevents a problem circuit from disabling the whole
system.
Note that the 120 Vac feed is protected by a circuit
breaker mounted to be accessible when the door is on
the panel while the 277VAC feed is protected by self
resetting thermal f uses. T he rotary switch also has a
position for OFF if the system needs to be de-powered.
Did we mention it is a good idea to get the phone line
installed early! It may not get u sed much so it could be
placed in parallel with a fax machine and plugged in as
necessary.
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