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2. Appliance classes - Wikipedia

   en.wikipedia.org/wiki/Appliance_classes

   This is usually achieved at least in part by having at least two layers of insulating material between live parts and the user, or by using reinforced insulation. In Europe, a double insulated appliance must be labelled Class II or double insulated or bear the double insulation symbol: ⧈ (a square inside another square). As such, the ...

3. Insulation system - Wikipedia

   en.wikipedia.org/wiki/Insulation_system

   Supplemental insulation is rated to withstand 1500 volts AC. Double insulation is a design concept where failure of one insulation system will not expose the user to a shock hazard due to the presence of a second independent layer of insulation. Reinforced insulation is a supplemental insulation system that is strong enough to effectively ...

4. IEC 62196 - Wikipedia

   en.wikipedia.org/wiki/IEC_62196

   This IEC technical specification extends IEC 62196-1 and describes specific designs of plugs, socket-outlets, vehicle connectors and vehicle inlets that are intended to be used for DC charging through circuits specified in IEC 61851–3 series, where protection against electric shock is ensured by double or reinforced insulation.

5. Extra-low voltage - Wikipedia

   en.wikipedia.org/wiki/Extra-low_voltage

   Electrical protective-separation (i.e., double insulation, reinforced insulation or protective screening) from all circuits other than SELV and PELV (i.e., all circuits that might carry higher voltages) Simple separation from other SELV systems, from PELV systems and from earth (ground) The safety of a SELV circuit is provided by

6. Insulator (electricity) - Wikipedia

   en.wikipedia.org/wiki/Insulator_(electricity)

   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 ...

7. Off-Road RVs Exist, and They're Really Freaking Cool

   www.aol.com/off-road-rvs-exist-theyre-230000388.html

   Don’t worry about your holding tanks, dump valves, and water lines freezing — Keystones have insulated and enclosed underbellies, floor insulation, double-layer fiberglass sidewalls, 12-volt ...