| Summary: | One of the electrical security systems used to protect critical infrastructure facilities is the intrusion detection system. Its purpose is to increase the safety level for the persons and property within the protected facility. The paper presents consideration regarding the reliability analysis of a type B power supply used in an intrusion detection system. This takes into account the guidelines regarding the analysed power supply system included in the standard “PN-EN 50131-1:2009: Alarm systems - Intrusion detection systems - Part 1: System requirements”. Next, a reliability analysis was performed, which enables the determination of the readiness indicator value. The conduction of further analyses of IDS power supply systems, though of distributed structures, is planned in subsequent studies regarding this issue.
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