Home Security Systems
Home Security System Repair Questions? Ask a Technician.
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I suggest that you first of all open the panel, and see if there is a battery inside it. If there is no battery, you may have to find the main alarm system box (which has both an AC power mains connection, and a battery inside it also.
To disable an alarm you have no other control over, you may remove the battery, then disconnect the AC mains connection also.
If it is just an alarm box that is going off, then you could disconnect that from the power instead, though the alarm may continue to silently give warning of whatever is wrong, over a phone line connection.