Model SK-5208 Fire Control/Communicator Installation and Operation Manual
3-14 P/N 151204
3.11 Detector Installation
3.11.1 Class A (Style D) Zones
Zones 1 and 2 may be selected through programming as Class A (Style D) zones (see Section
4.2.2 for zone style programming). See Section 3.11.2 for Class B (Style B) configuration.
Each class A zone is a four-wire circuit that allows an alarm to be detected even after a single
open or ground fault occurs. When a single open or ground fault occurs, the audible trouble
signal will sound and the SK-5208 will report the trouble to the central station or remote
station (if programmed to report troubles). If reporting to a remote station troubles may be
transmitted to a secondary location.
Figure 3-5 shows how to wire a Class A (Style D) circuit. No end-of-line (EOL) resistors are
needed for these zones. These zones must be wired using normally open contacts.
Figure 3-5 Class A (Style D) Supervised Fire Circuit
Maximum voltage: 17.5 to 28 VDC Full Wave Rectified
Circuit Current: 95 mA
Maximum circuit Resistance: 50 ohms
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