Monitoring of alarm system wiring

Details Monitoring of alarm system wiring Monitoring of alarm system wiring

2005-10-28

2008-05-13

Lee, Benjamin C. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S635000, C340S651000, C324S525000

Reexamination Certificate

active

07372369

ABSTRACT:
A supervisory method and apparatus provide for detection of “partial fault” conditions such as a relatively high series impedance in the wiring, or a relatively low parallel impedance across the wiring. A non-linear element, such as a semiconductor diode, can be used as an end of line element. The element functions as a current controlled dynamic impedance such that currents through the element can be used to detect low parallel leakage currents. Higher currents through the element can be used to detect partial open circuits.

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Communication, European Patent Office, “European Search Report”, Mar. 28, 2006—Munich, 3 pages.

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