Earthing is the grounding of electrical devices with the aimed to protect the system from effect of thunder lighting strike. Lighting due to the thunder storm,can flow cable of electrical device and burnt it or it can burnt the whole building. Good earthing is very important, in all electrical devices and machines. It is advisable to unplug your devices during rainfall.
WHY WE NEED EARTHING?
Earthing is the grounding of
electrical devices for the purpose of protection and safety from leakage
current or thunder storm that can lead to damage of electrical devices.
Earthing system can be found in all
the electrical devices, it can found since from Generation, Transmission and
distribution Stations. Also it can found at substations. It has vital function as per as protection and safety
concern, that is reason you can found it inside DVD, Computer System and Cars.
To have more safety in your building, you must have good electrical earthing
system. In standard lighting system, lamp holder has three terminals while
power socket has four terminals include earth terminal, this will give complete
and accurate earthing system in the whole building.
To connect your earth rod, connect
earth cable with terminal of E.L.C.B to the earth rod which you will dig it
inside ground, make sure the place is soft and has some moisture for low
resistance. If there’s any leakage current or thunder storm it will follow the
earth cable to the ground in a safe manner. Lighting arrest-er can also used
because thunder storm always looks for heel object to pass through, that is
reason it fix at roof of buildings. Have you observed it? Take note E.LC.B
DIVIDED INT TWO:
a-
Voltage operated
b- Current Operated
Voltage
Operated type: Normally trip off, if there’s leakage current, with condition of proper
earthing.
Current Operated type : Trip off if there’s short circuit or fault, but it
does not need earthing, that is reason is more expensive but it is accurate and
it has real sensitivity for protection.
Did you experience receiving electric
shock during replacing of electric bulb? If yes, is because of lack of proper
earthing in your building. Sometime, during tapping pump. But if there’s proper
earthing, you will not receive shock. The height of earth rod is 3meters it can
pipe type or dig directly into the ground.
Earthing is important:
-To prevent thunder storm from
damaging our electrical devices.
-It safeguard electrical/ electronics
devices.
-it serve as a barrier to fire
outbreak.
-It eliminate interference with
communication circuits, it can constructive or destructive interference.
The wonderful thing with earthing is,
you can found it in both Alternating
Current(AC) or Direct Current(DC) appliances. Study the diagram below:
