Contents
Which appliances should be earthed?
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.
Do sockets need to be earthed?
No earthing of any wall sockets or lighting.
Why are some appliances not earthed?
Some appliances, such as vacuum cleaners and electric drills, do not have an earth wire. This is because they have plastic casings, or they have been designed so that the live wire cannot touch the casing. As a result, the casing cannot give an electric shock, even if the wires inside become loose.
Should metal appliances be earthed?
Electrical appliances are earthed to protect from an electric shock. Due to break of insulation of wire, live wire may come in contact with the body of the appliance and pass the current to the appliance and on being touched a fatal shock can occur.
Why are plug sockets earthed?
The U.K. plug is designed so that the grounding prong is slightly longer than the prongs responsible for transferring current. Like a tumbler in a lock, this grounding prong is responsible for “unlocking” the socket, giving access to the more dangerous live and neutral terminals.
How do I know if an appliance is earthed?
Check the voltage when the leads are inserted to the live and earthing ports.
- If your home has earthing, then the reading should be the same as or within 5 volts of the first reading you took.
- If the reading between the live and earthing ports is close to 0, then you don’t have any earthing on that outlet.
How are electrical plugs and sockets different from one another?
Electrical plugs and sockets differ from one another in voltage and current rating, shape, size, and connector type. Different standard systems of plugs and sockets are used around the world. Plugs and sockets for portable appliances became available in the 1880s, to replace connections to light sockets with wall-mounted outlets.
What happens if you overload an electrical socket?
Don’t overload sockets – plugging too many electrical appliances into one socket can lead to overheating. Be vigilant, checked regularly for signs of dangerous or loose wiring such as hot plugs and sockets indicate something is wrong.
How is electric shock protected in Class II equipment?
The method of protection against electric shock in the case of class II equipment is either double insulation or reinforced insulation. In double insulated equipment the basic protection is afforded by the first layer of insulation.
Are there any technical standards for universal sockets?
Universal sockets may not meet technical standards for durability, plug retention force, temperature rise of components, or other performance requirements, as they are outside the scope of national and international technical standards. A technical standard may include compatibility of a socket with more than one form of plug.