Electricity is useful as well as dangerous; you could get grilled alive if you touch a 240V bare wire!
So that you’re always safe and sound, here are a number of aspects of the design of electrical systems and how they can be used as safely:
Electric cables are chosen according to the tasks they need to be used for; for different uses, there are electric cables of different thicknesses.
For safety reasons, electric cables are double insulated so that, even if they come in contact with a person, they would not cause harm.
Many times, electrical appliances (such as hair dryers, electric cookers etc.) are earthed by connecting them to the earth wire in electric cables. This reduces the probability of someone getting a deadly electric shock!
Another danger that can arise when using electric cables is that, if too much current flows through, they can heat up to extents that will cause their insulation to melt and emit poisonous fumes or even catch fire!
This calamity can be avoided by using a fuse, or by not using devices that draw too much of current.
Fuses are included in circuits to prevent excessive current from flowing through them.
Fuses work by melting a fuse wire when a huge current flows through them. This disconnects the circuit, preventing current from flowing.
The thicker the fuse wire, the higher the current needed to blow them off.
It is extremely important to choose a fuse of the correct value for every electrical appliance; if an electric cooker normally functions with a current of 50A, a fuse of 55A can be useful.
A circuit breaker is a safety device which automatically switches off a circuit when the current becomes too high.
There are two types of circuit breakers used in electrical safety:
A trip switch
When a current flowing through a circuit exceeds a certain value, the switch ‘trips’, breaking the electric current flow in the circuit.
Modern households make use of trip switches instead of fuses as fuses need to be replaced all the time.
A residual current device (RCD)
A RCD is a type of circuit breaker which is used to protect the user rather than the electrical appliance when there is an electric fault.
A RCD works by detecting any difference between the currents in the live and neutral wires. If a difference between the two wires is detected, an RCD switches OFF the supply.
Every modern household does make use of these devices for electrical safety.
We hope you remain safe as well 🙂
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