Continuity-isolation testing for class a wiring in fire...

Details Continuity-isolation testing for class a wiring in fire... Continuity-isolation testing for class a wiring in fire...

G - Physics

08

B

340/77

G08B 29/04 (2006.01) G08B 26/00 (2006.01) G08B 29/06 (2006.01)

Patent

CA 2013611

EU-244 CONTINUITY-ISOLATION TESTING FOR CLASS A WIRING IN FIRE ALARM SYSTEM ABSTRACT An improvement is provided in a fire alarm system in which a large number of terminal units, comprising detectors and interface circuits, at a variety of locations are coupled or connected in separate, independent loops of the system, each of the scattered terminal units being addressable from a central control panel. The arrangement is such that serial synchronous power transmission and data communication is effectuated over the individual loop of the system. The improvement resides in providing con- tinuity-isolation testing for a Class A wiring scheme involved in the loops. By Class A opera- tion is meant that there are two separate channels involved in each loop. A continuity test is se- quentially performed on both channels of the loop such that discontinuities can be precisely lo- cated. - 1 -

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