Importance of safety devices:
1. Switches: Switch is device which controls the flow of electron. Control is of binary type i.e. either it allows the electron flow or it stops the electron flow completely. Safety switches protect you from electric shock. They turn off the electricity supply within milliseconds if an electric fault is detected. Switch is used to make or break an electric circuit.
2. Fuses: The primary use of an electric fuse is to protect electrical equipment from excessive current and to prevent short circuits. Each fuse have a maximum current handling capability or current rating above that current the fuse wire is blown away and protect the whole system from damage. It also protects overheating from excess current. Electrical fuse play the role of miniature circuit breakers.
3. Earthing wire: Earthing is grounding the astray currents in the circuit. Earthing give protection from electric overload. It helps to direct the current where we want. It stabilizes the voltage level.
Earthing is used to protect you from an electric shock. It provides a path for a fault current to flow to earth. It also causes the protective device to switch off the electric circuit that has the fault.
