Patent ID: 7768760

Claim:
A power distribution bus alarm circuit comprising: a first and a second socket, each having three alarm connections and two power connections plugged into the bus; an alarm circuit connected to first and second alarm connections of the first and second sockets, the alarm circuit being responsive to a voltage being applied from the first of the three connections of the first or second socket and being responsive to a voltage being applied across second and third connections of the first or second sockets; a second alarm circuit connected to first and second alarm connections of the first socket, the alarm circuit being responsive to a voltage being applied from the first of the three connections of the first socket and being responsive to a voltage being applied across second and third connections of the first socket; and a third alarm circuit connected to first and second alarm connections of the second socket, the alarm circuit being responsive to a voltage being applied from the first of the three connections of the second socket and being responsive to a voltage being applied across second and third connections of the second socket.