Double Insulated Wire Definition
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Double insulation protects the user of the appliance from an electrical shock by preventing any possibility of the external casing becoming live the live wire can not touch the casing even if wires inside become loose thus eliminating the need for an earth connection.
Double insulated wire definition. Symbol for double insulation some appliances such as vacuum cleaners and electric drills do not have an earth wire. Overhead conductors for high voltage electric power transmission are bare and are insulated by the surrounding air. An appliance that is double insulated has the whole of the inside contained in plastic underneath an outer casing. Insulating supports called insulators are required at the points where they are supported by utility poles or transmission towers insulators are also required where the wire enters.
Underwriter s laboratories is the organization which certifies whether a tool is double insulated. Double insulated double insulated or class 2 electrical appliances are products that have been designed in a way so as not to require a safety connection to electrical earth these products must not have a safety connection to earth. The appliance is designed in such a way that the electrical parts can never come into. Electrical insulation an electrical appliance which is double insulated does not have an earth wire fitted.
It does not have a casing or housing made from conductive material. These appliances only need live and neutral wires. The two layers of insulation are. Instead it is made of plastic or some other material that does not conduct electricity.
Earthing and double earthing and double insulation. If the tool passes its tests they allow the manufacturer to mark the tool with a ul approved symbol such as the 1 000 volt symbol. This is because they have plastic casings or they have been designed so that. But a double insulated tool is made differently.
Mains electricity what is double insulation. Conductors for lower voltages in distribution may have some insulation but are often bare as well. This symbol means the tool has been tested with 10 000 volts far more than it is ever likely to see in actual use. Wire covered with some nonconducting material such as plastic or silk for use in conducting electricity.
They do not need an earth wire.
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