Egypt Engineering Consultant Electrical

Practice session

An addressable fire alarm Signaling Line Circuit (SLC) loop operates with a maximum allowable loop line resistance of 50 ohms. The loop is wired using 2-core 1.5 mm² twisted shielded fire-resistant copper cable with a loop resistance (out-and-back) of 24.2 ohms per kilometer. What is the maximum theoretical cable run length for this addressable loop?

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