Concentrated Solar Power, Getting to the heart of energy - LEONI

www.leoni-communication-infrastructure.comCircuit integrityunder fireTechnical Information95The circuit integrity indicates, how long a free cable retains itsisolation in a fire without causing a short-circuit. According to itsinternational standard, a cable is laid horizontally over a burnerfor three hours. The temperature is set at 800 °C. The circuitintegrity is designated with FE (e.g. FE180 = circuit integrity of180 min): BETAflam® FE180 / E30Test proceduresThe sample is fastened at definited distances above the burner.The conductor is connected to a power source at nominal voltagevia an 2 A fuse. The test is considered to be passed, if duringthe test no short circuit or circuit interruption occurs.Test standardsIEC 60331-11 und -21IEC 60331 Tests on electric cables and fire conditions – insulationmaintenanceIEC 60331-1 Fire with shock at a flame temperature of at least830 °C for cables and insulated conductors withnominal voltages up to and including 0,6/1 kVand an external diameter of more than 20 mmIEC 60331-2 Fire with shock at a flame temperature of at least830 °C for cables and insulated conductors withnominal voltages up to and including 0,6/1 kVand an external diameter equal to or smaller than20 mmIEC 60331-3 Fire with shock at a flame temperature of at least830 °C for cables and insulated conductors withnominal voltages up to and including 0,6/1 kVtested in a metal tubeIEC 60331-11 Apparatus Fire alone at temperature ofat least 750 °CIEC 60331-21 Procedures and requirements – Cables of ratedvoltage up to and including 0.6/1 kVIEC 60331-22 Procedures and requirements – Cables of ratedvoltage greater than 1 kV (under consideration)IEC 60331-23 Proc. and requirements – Electric data cablesIEC 60331-25 Proc. and requirements – Optical fiber cables4570 ± 10RSTN, PE1200Cable70 ± 10