If an electrical appliance such as a kettle, microwave or record player stopped working, what would you do? .
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First, you might check the fuse. .
Fuses are commonly found inside electrical plugs. .
The purpose of the fuse is to protect the delicate, low voltage electronics found inside all electrical appliances. It prevents too much electricity flowing into the appliance if a fault occurs, such as a wire coming loose. If the flow of electricity becomes greater than a certain level, the fuse will "blow". .
The fuse is really a thin wire inside a glass or ceramic cartridge. .
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When the fuse "blows" the thin wire melts and the electricity supply to the appliance is cut off. Some fuses, usually the low voltage ones, have a glass cartridge and you will be able to see if the wire inside is broken. The fuse inside most household appliance plugs, however, is usually a ceramic cartridge and you will not be able to see the wire inside. It is for this reason that a fuse tester is needed. .
Fuses are quite delicate. If the fuse is old, or it has been dropped, it could "blow" even if there is no fault in the appliance.
Main Switch.
The main switch allows you to turn off the electricity supply to the electrical installation. Note that some electrical installations may have more than one main switch. For example, if your house is heated by electric storage heaters, you will probably have a separate main switch and consumer unit arranged to supply them.
It is important to know where the consumer unit is located and that it is accessible. It is also important that you know where the main switch(s) is in order to turn it (them) off in the event of an emergency.
A consumer unit or fuse box comprises a co-ordinated assembly for the control and distribution of electrical energy, principally in domestic premises. A consumer unit incorporates a manual means of isolation on the incoming circuit(s) - a main switch, and an assembly of one or more fuses, circuit-breakers or residual current devices.
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