Purpose and method of earthling

The main purpose of the earthling is to save the installations and also the man working on it. If all the metallic parts of the electrical system are grounded then no dangerous voltage is present in the system even if insulation falls. The person is saved by giving other way to the flow of fault current by blowing the fuse. The earthling also saves building, equipment, machinery and appliances from fault conditions. The other aims of making earthling are to prevent the conducting part from reaching dangerous point. It also gives safe way to the short circuit currents. The earthling keeps the voltage level in a system at known level; this prevents the excess current in the appliances.

During lighting, unintentional contact or surges the high voltage lines can give dangerously voltage to the electrical system, the earthling proves safe path to this current to save the system from damage.

There are various methods of earthling. In the plate earthling method, plates of cast iron or galvanized steel or copper are used. These plates are buried at the depth of up to 8 feet in the vertical position. The GI strip of size approximately 50mmx 6mm is brought to the ground level. This GI strip is bolted with the plate. The earth pit is filled with charcoal and salt in alternate layers up to 4 feet from bottom of the pit.      

In pipe type earthling generally the GI pipe is used. This pipe is 10 feet long with 75 mm diameter with 6 holes for inserting earth wires. The pipe is put in the ground by auger method. The earth pits are filled either with salt and charcoal or with earth reactivation compound.

The resistance of the earth Drop out Fuse Set Manufacturers to the passage of current depends on the condition of the soil and it varies from soil to soil. The physical composition of the soil, the level of moisture in it, amount of dissolved salts, size of grains, and season variations of the earth, all affect the resistivity of the soil. The dry soil is very poor conductor of the current.

Moisture also has a say in the soil resistivity. The earth itself is not good conductor of current but the presence Chemical Earthing Material Manufacturers of water or salinity in it can cause current to flow through it. Therefore the water is added in and around the earth pit to keep moisture in it. During dry conditions, the level of moisture determines the soil resistivity. The moisture in climate also influences the soil resistivity. In rainy season the soil resistivity will be low. While in dry season, the resistivity is high. Location of the earth pit also determines the soil resistivity. The place where water runs off from slope and hilly areas, the pit will remain dry.  Earth pits in such places are given water at frequent intervals especially in dry weather.