Search for: [Description = The following paper presents issues concerning a power supply for the alarm systems used in transport facilities. It describes the guidelines included in the polish standard PN\-EN 50131\-1\:2009 „Systemy alarmowe – Systemy sygnalizacji włamania i napadu – Wymagania systemowe” \(Alarm systems – intrusion and hold\-up systems – system requirements\), a power supply in particular. Then the operational\-reliability assessment of a system consisting of a main power supply \(230V AC power grid\), redundant UPS and diesel generator was made. The aim of that was to obtain formulas for particular state probability values in a symbolic form \(Laplace’s\). The further assessments taking other types of power supply into account will be presented in the forthcoming papers.]

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