| Type of Protection whereby parts that are capable of igniting an explosive atmosphere by either sparking or heating are enclosed in a compound in such a way as to avoid ignition of a dust layer or cloud under operating or installation conditions Note 1 to entry: Type of Protection "mD" has been replaced by Type of Protection "m" in accordance with IEC 60079-18, Explosive atmospheres – Part 18: Equipment protection by encapsulation "m". Note 2 to entry: This entry was numbered 426-18-01 in IEC 60050-426:2008.
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