Abstract: A shunt arrangement for a premise alarm system which includes a plurality of secure/alarm zone signal inputs and a plurality of alarm circuit outputs. In the shunt arrangement, logic circuitry disables the coupling of the secure/alarm zone signal inputs from the alarm circuit outputs. The shunt arrangement is activated by a shunt switch located remotely from the logic circuitry, and the logic circuitry further includes an indicator light for indicating a zone alarm condition when the shunt switch is activated. The logic circuitry further includes a local test switch operable to produce simulated alarm circuit outputs although the shunt switch is activated.

Abstract: An alarm circuit includes an alarm condition indicating section having an alarm indicator, such as a lamp, and a power supply therefor, the lamp becoming illuminated in response to sensing of an alarm condition. Also included is an alarm condition sensing element, such as a normally open switch or a photoconductor normally incident with a low level of light, which under normal conditions, i.e., in the absence of an alarm condition, exhibits a very high impedance, but which in response to an alarm condition exhibits a low impedance. The alarm condition sensing element is connected to the alarm condition indicator and in response to the sensing of an alarm condition and being placed in its low impedance condition causes the alarm indicator to provide an alarm indication.