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Why does a plastic hairdryer not need an earth wire?
Appliances encased in an insulating plastic case or body, such as hair dryers, mobile phone chargers and hand whisks do not need an Earth wire. Such appliance are designed so that there are two levels of insulating material between the electrical parts of the appliance and any parts on the outside that can be touched.
What appliances require earth wires?
Many electrical appliances – including cookers, washing machines and refrigerators – have metal cases. You would get an electric shock if the live wire inside an appliance, such as a cooker, came loose and touched the metal casing.
What is the purpose of an earth wire in an appliance?
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
Does double insulated need to be earthed?
Appliances that are double insulated include TVs, computers, printers and hairdryers. Some appliances have double insulation. These appliances only need live and neutral wires. They do not need an earth wire.
What is the potential difference between neutral and earth?
The neutral wire is at 0 V (earth potential).
What does double insulated mean?
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. Double insulation construction of appliances and tools allows the manufacturer to produce a lower-cost product.
What if there is no earth wire?
If you are using an earthed three core cable with a unit which does not need to be earthed then the earth cable can simply be trimmed back and safely secured using electrical insulation tape.
Is earth wire necessary?
Why is it necessary to earth metallic appliances? The metallic body of electric appliances is connected to the earth using earth wire so that any leakage of electric current is transferred to the ground. This prevents any electric shock to the user.
What happens if you don’t have an earth wire?
Without the earth wire, if a fault occurs and the live wire becomes loose, there is a danger that it will touch the case. The next person who uses the appliance could get electrocuted . As a result, the casing cannot give an electric shock, even if the wires inside become loose.
Why is the earth wire not insulated?
Why are grounding wires not insulated? – Quora. Because the bottom side of the circuit is firmly connected to ground through the grounding point on the lower-left of the circuit, the lower conductor of the circuit is made electrically common with earth ground.
Can an earth wire electrocute you?
No, you cannot get an electrical shock from a properly connected ground wire.