Report - IPS-M-EL-143(1) - det-mop.irdet-mop.ir/ips/el/m-el-143.pdf · IPS-M-EL-143(1) 3 IEC 60079-10 ... 5.1.4 Definition of Form 3b and Form 4a extracted from IEC 60439-1 is as follows:

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