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Further, 3/20 & 7/20 mean 3 & 7 strands of 20 SWG wire.

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the full form of FRL is flame retardent low smoke

i have ht transformer of 142 kva with air cooled facility,having secondary voltage 7850volt, and secondary connected full way bridge rectifier .i faced the problem repeatedly that transformer one coil and rectifier diode of two phase was burnt two times. i checked all the secondary ckt. no any short ckt found,then what will be the cause side

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