Whats the difference between a supervisory alarm and a trouble signal?
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A “trouble” indication on a fire alarm system represents a problem that may adversely affect the operation of the system (as a whole). In most cases, this must be addressed by trained service personnel. Examples of a “trouble” signal are: AC power failure, battery trouble, ground fault, indicating circuit “open”, signal circuit “short” or “open”. A “supervisory” signal is an “off normal” indication of a monitored device. In most cases this type of signal doesn’t require the response of trained service personnel. Restoring the monitored device to “normal” and resetting the fire alarm system usually clears this type of indication. Examples would be: sprinkler “low air”, sprinkler “low water”, generator “trouble”, fire pump “trouble”, movement of a sprinkler valve handle, heat trace power failure (or common trouble), etc. It is important to remember that a supervisory signal often triggers a relay in the fire alarm’s common control that is separate from the “trouble” contact. You must ens