Why must exposed metal work on a double insulated appliance must not be connected to earth?

Should double insulated appliances ever be earthed?

There is no need to. The manufacturer designed the appliance for the specification of not needing a ground to be connected to it.

What are the function of double insulated case?

An electrical appliance which is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device. Common double insulated appliances are hair dryers, radios and cassette players.

What are the functions of Double insulation?

An electrical appliance which is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device. Common double insulated appliances are hair dryers, radios and cassette players.

What is double insulation?

Electrical insulation:An electrical appliance which is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device. Common double insulated appliances are hair dryers, radios and cassette players.

What do you do with a green wire that is not connected to the last smoke alarm in the hard wire system?

Fold it back on itself and tape it up. Smoke alarms are double insulated (no exposed conductive parts) and aren't required to be earthed.

Can you name an appliance which are double insulated?

An electrical appliance which is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device. Common double insulated appliances are hair dryers, radios and cassette players. A wet double insulated appliance is exceptionally dangerous - water is a good conductor of electricity and will easily reach the live electrical components within the case. Any human user touching the casing will then receive an electric shock. It is important to note that the human conductivity is increased when hands are wet, allowing a greater current to flow through the casualty. For this reason, do not operate a mains radio, hairdryer or double insulated appliance in any wet area - especially a bathroom Do not touch any person who has been electrocuted until you are sure that the electricity supply has been shut off. An electrical appliance which is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device. Common double insulated appliances are hair dryers, radios and cassette players. A wet double insulated appliance is exceptionallydangerous - water is a good conductor of electricity and will easily reach the live electrical components within the case. Any human user touching the casing will then receive an electric shock. It is important to note that the human conductivity is increased when hands are wet, allowing a greater current to flow through the casualty. For this reason, do not operate a mains radio, hairdryer or double insulated appliance in any wet area - especially a bathroom Do not touch any person who has been electrocuted until you are sure that the electricity supply has been shut off.

How one can insert a 2 terminal plug in a three pin socket?

as long as the pins are the same on the plug to socket you just push it in, when a plug has only 2 pins it is double insulated look for 2 squares one inside the other this is the symbol ;double insulated means no metal in casing on the appliance

What does the symbol depicting a smaller square inside a larger one indicate about an appliance?

The symbol depicting a smaller square inside a larger one indicate on an appliance indicates that it is double insulated. Some appliances may contain other symbols to indicate this.

Which is better double insulated or grounded?

It is best to use both, then usually grounded, then double insulated is just OK.

What is a double insulated case?

Double insolated cases

Is there a symbol to identify a double insulated power tool?

A double insulated tool will have a picture of a box with a second box inside.

What different eletrical tree-prong plug and two-prong-plug?

The difference is safety. Any appliance or equipment that has metal parts that may be touched by the user will usually have 3 prongs because this provides for safety if those metal parts become energized. Exceptions would be "double insulated" items, such as many power tools, and items without exposed metal parts.