An earthing or grounding system refers to the setup that connects an electric power system and the earth or ground, typically the earth’s conductive surface. The arrangement is made mainly for safety and functional purposes. The lightning rod on tall structures, helps to channelise the power to the ground after being hit by lightning. The metal structure of the telegraph line is directly bolted to the ground and uses earth as one conductor. Incase of small buildings, an earthing system is installed while constructing.
In case of GI earthing, galvanised steel strips are placed as buried under the ground, connecting the electrical system. Main component for the strips is steel and a galzanised coating of Zinc on top makes them more durable and corrosion resistant. The buried system provides a low resistance path and syphon any electrical fault or surges to the ground. It is widely used in industrial as well as residential structures to fence any hazard to human or any electrical equipment.
In this technique, a copper plate is used as it is a great electrode due to high conductivity. The plate is located in the underground pit. The electrical system is connected with the plate through copper wires. The plate is embedded in the earth hole at a minimum depth of 3 metres. Soil’s condition plays an important role for the process. Depending on the soil-moisture, the copper plate is placed in the underground pit. The ideal condition is a constant damp one.
To build a earthing system, formula of resistivity is the main base. It involves many factors that has a direct influence. Let’s have a brief understanding.
When a potential difference is applied across an object (conductor), the electrons start moving, which produces a current in the object. During this movement of electrons, they collide with other electrons too, which causes some opposition to the flow of electrons, this phenomenon of opposing the flow of electrons is known as Resistance. The resistivity of a material is defined as the resistance of a conductor of material per unit length and per unit cross-sectional area at a particular temperature. Resistivity also depends upon the nature of the material and temperature as well.
Formula: ρ = (RA)/l
Where, ρ (rho) = Unit of Resistivity
R = Resistance
A = Area of cross-section
l = Length of material
There are several factors which need to be considered while choosing the system.
Finally, we can say that both system have advantages of different types. Based on the requirement and location, the technique is implicated.
With all the above information, it is easy to choose which element is a better one for your requirements. A professional help can also suggest the best technique for the requirement.
Pinax steel manufacture the GI earthing strips with best quality steel. For a detailed understanding, feel free to contact us.