| Type of Protection based on the restriction of electrical energy within apparatus and of interconnecting wiring exposed to the potentially explosive atmosphere to a level below that which can cause ignition by either sparking or heating effects Note 1 to entry: Type of Protection "iD" has been replaced by Type of Protection "i" in accordance with IEC 60079-11, Explosive atmospheres – Part 11: Equipment protection by intrinsic safety "i". Note 2 to entry: This entry was numbered 426-19-01 in IEC 60050-426:2008.
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