In order to perform work such as installing and repairing, a technician must have basic knowledge of wiring and tools and equipment that he has to work with/upon.
Domestic wiring
In our homes, we receive power supply through a main supply. These are either supported through overhead electric poles or by underground cables. The electric power line entering our house follows a color code for insulating these wires to avoid confusion:
The live wire has a high potential of 220 volt whereas the neutral
wire has zero potential. Thus, the potential difference between the live wire and the neutral wire is 220-0=220volt.The following image shows schematic diagram of one of the common domestic circuits:
Both live wire and neutral wire, come form an electric pole,then it is entered in a box fitted outside the house which consists main fuse.
A fuse is a piece of wire of a material with a very low melting point. This wire is connected in series to the "live wire" When a short circuit occurs due to high current flow,the wire heats up and melts due to which the circuit breaks and the current stops flowing.
Tools used by a Technician
There are various tools used by a technician for performing tasks such as installation and repairing of dysfunctional appliances.
Domestic wiring
In our homes, we receive power supply through a main supply. These are either supported through overhead electric poles or by underground cables. The electric power line entering our house follows a color code for insulating these wires to avoid confusion:
- Red wire:live wire
- Black wire: neutral wire
- Green wire:earth wire
The live wire has a high potential of 220 volt whereas the neutral
 |
| Common domestic circuits |
Both live wire and neutral wire, come form an electric pole,then it is entered in a box fitted outside the house which consists main fuse.
A fuse is a piece of wire of a material with a very low melting point. This wire is connected in series to the "live wire" When a short circuit occurs due to high current flow,the wire heats up and melts due to which the circuit breaks and the current stops flowing.
Tools used by a Technician
There are various tools used by a technician for performing tasks such as installation and repairing of dysfunctional appliances.
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