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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 appliance should not be connected to an earth conductor because the high-impedance casing will cause only low-fault currents that are unable to trigger the fusible cut-out.
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 ...
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 perform as if a double insulation system was present.
For example, power semiconductors connected to the line voltage may be switched by opto-isolators driven from low-voltage circuits, which then need not be insulated from the higher line voltage. Transformers allow the output of a device to float relative to ground to avoid potential ground loops. Power isolation transformers increase the safety ...
This page was last edited on 29 January 2005, at 17:02 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Even if an isolation transformer is used, hazardous voltages may still be present between components of the isolated device. Thus it is still possible for an operator to be exposed to lethal voltages by touching multiple elements in the circuit. An isolation transformer provides maximum protection when the device is ungrounded.
The test is a means to qualify a device's ability to operate safely during rated electrical conditions. [1] If the current through a device under test is less than a specified limit at the required test potential and time duration, the device meets the dielectric withstand requirement.
Moulded plugs for unearthed, double-insulated appliances may instead have a non-conductive plastic pin (an Insulated Shutter Opening Device or ISOD) the same size and shape as an earth pin, to open the shutters. When looking at the plug pins with the earth uppermost the lower left pin is live, and the lower right is neutral.
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