Earthing connects all the major electrical equipment in our house such as fridge, AC, washing machine, grinder to the ground. So when there is an event of a power surge or lightning strike the extra current formed in the system is easily drawn down to the earth, protecting them from fire or damage.
Here are the reasons to do an effective house earthing:
a) To protect electrical appliances from damages arising due to faulty currents.
b) To prevent the risk of fire outbreaks that may arise from current leakage.
c) To maintain a stable voltage in three-phase circuits of an electrical system, even when the load is unstable.
d) Earthing prevents electric shock and damage caused by lightning strikes, by providing a low resistive path that quickly carries the fault currents to the ground.
House Earthing Design :
In house wiring, a connection from the earth point of all sockets is connected to the earth link in the Distribution Box. From the distribution box (DB), we connect them to the earth plate or earth electrode.
Whenever there is a circuit overload or power surge, current flows through the earth electrode to the ground. House earthing protects you from electric shock by providing a conductive path that carries the faulty current to the ground.
House Electrical grounding is one of the easy techniques for electrical safety in a house and requires the following materials:
- Earthing rod
- Earthing wire
- Industrial salt
- Charcoal/ Earthing compound
- Earth link
They include spanners and pliers to adjust the clamp, a continuity tester to test for continuity.
Other tools needed for earthing include a shovel, digger, or excavating machine.
Procedure for House Earthing:
- For earthing a building first, dig a pit to bury the ground electrode. The pit should be close to the house and about 3m deep.
- Fill the pit with a layer of salt, and charcoal (or earthing compound) and place the earth rod vertically inside the pit. Fill the remaining portion of the pit with some salt, and charcoal (or earthing compound) layer.
- Connect the earthing link to the electrode using earth wires.
- Use a spanner and plier to adjust the clamp.
- Once done with the connection, test for continuity during the continuity tester.
You can easily check if your house earthing is effective in different ways. We shall discuss two such methods by which you can identify if the earthing you have is efficient or not.
First Method: Using a test lamp/bulb
Plug the wires from the lamp into the positive and negative ports of the outlets or sockets. The positive port should go to the right hole of the socket, while the negative port should be connected to the left hole. Turn ON the switch, and you will see the bulb glowing brightly. Now, remove the negative wire and insert it into the earthing port (the top hole) of the socket. The bulb should glow brightly as before. If it does not glow, it means there is no earthing in the house. But if the bulb glows and dims or flickers, it means that the house earthing is faulty.
Second Method: Using a multimeter
- Using a multimeter is a more accurate method when checking the earthing of a house, and you can use them on both alternate current (AC) and direct current (DC).
- To check for AC, move the pointer of the multimeter to the AC value. To check for DC, you can move the pointer to DC value.
- First, attach the positive (red) probe to the port labelled “V”, “Ω,” or “+”, and the negative (black) probe to the port labelled “COM” or “-“.
- Insert the red probe on the positive hole and the black on the negative hole of the socket. Check and write the value.
- Remove the black probe and insert it into the earthing hole of the socket. Observe the value, it must tally with the earlier value.
- If there is a lesser or no value, you can understand that the earthing is faulty.
If a house is not earthed, people and animals living there may get electrocuted whenever there is a power surge. It may also damage the appliances and can even cause a fire outbreak. So it is crucial to have an efficient earthing done for every house.
Read more about Earthing:
What kind of Earthing should I use?
Plate Earthing Diagram – Explained
GI vs Copper Plate Earthing – Which one is better?
Pipe Earthing vs Chemical Earthing
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