IEC 61140
Insulation class (Class I/II/III)
Isolatieklasse (Klasse I/II/III)
Also known as: klasse-i, klasse-ii, klasse-iii, isolatieklasse, double-insulation, protection-class, safety-class, insulation-class, beschermklasse, beschermklasse-i, beschermklasse-ii, beschermklasse-iii, dubbel-ge-soleerd, dubbelge-soleerd, class-ii-appliance, double-insulated, klasse-2, dubbel-geisoleerd, class-ii, versterkte-isolatie, reinforced-insulation, klasse-3, class-iii-tool, klasse-ii-gereedschap, dubbele-isolatie-voordeel, handgereedschap-vochtig
Classification of electrical equipment by shock protection method. Class I: basic insulation + PE connection; Class II (⌘ symbol): double/reinforced insulation, no PE; Class III: supply ≤ 50 V (SELV/PELV). Determines if a 2- or 3-conductor cable is permitted.
Practical example
Insulation class (Class I/II/III). A hand drill with double insulation (□ symbol) has a two-core cord without PE, while a metal coffee maker as Class I has a three-pin plug with PE.
Common mistake
Insulation class (Class I/II/III) Common mistake: Connecting a Class II device to PE — unnecessary and disrupts double insulation symmetry.
See also
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