Editing Insulator (electricity) (section)

===Class I and Class II insulation===
{{Main|Appliance classes}}
All portable or hand-held electrical devices are insulated to protect their user from harmful shock.

Class I insulation requires that the metal body and other exposed metal parts of the device be connected to earth via a ''grounding wire'' that is [[earth (electricity)|earth]]ed at the main service panel—but only needs basic insulation on the conductors. This equipment needs an extra pin on the [[power plug]] for the grounding connection.

Class II insulation means that the device is ''double insulated''. This is used on some appliances such as electric shavers, hair dryers and portable power tools. Double insulation requires that the devices have both basic and supplementary insulation, each of which is sufficient to prevent [[electric shock]]. All internal electrically energized components are totally enclosed within an insulated body that prevents any contact with "live" parts. In the [[European Union|EU]], double insulated appliances all are marked with a symbol of two squares, one inside the other.<ref>{{cite news |title= Understanding IEC Appliance Insulation Classes: I, II and III |url= http://www.fiduspower.com/news/understanding-iec-appliance-insulation-classes-i-ii-and-iii |work= Fidus Power |date= 6 July 2018 |access-date= 16 October 2018 |archive-date= 17 February 2020 |archive-url= https://web.archive.org/web/20200217041731/http://www.fiduspower.com/news/understanding-iec-appliance-insulation-classes-i-ii-and-iii |url-status= dead }}</ref>

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