What is a double insulation
Answers
Answer:
Many of the newer small electrical appliances and tools do not have a the third grounding prong on the plug. ... Appliances and tools of this type are called "double insulated". They have two levels of insulating materials between the electrical parts of the appliance and any parts on the outside that you touch.
Explanation:
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Answer:
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Explanation:
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 hairdryers, 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 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.
OR
Double insulation is introduced to protect people from electric shocks.
For example, all power tools working on mains voltage nowadays are certified for double insulation requirement. This is done by insulating armature core and stator cores of the motor with thermoplastic before copper windings are made on them.
Even the motor shaft is not directly welded on rotor core but insulated using resin filler. This prevents high voltage from armature winding leaking into the motor shaft in the event of above-mentioned insulation failed.
Final gate against electric shocks to the operator is making the entire outer shell of the power tool by plastic.
With all these arrangements, most modern power tool does not even require Protective Earth wire. That's why they are called Double Insulation compliant. please mark as brainliest, please.