Share with your Facebook friends! If the live wire touches the pipe earthing and plate earthing pdf case then the circuit is effectively shorted and fuse will immediately blow. When the fuse is blown then the dangerous voltages are away.
Do You Understand What Is Electric Shock? To ensure that all exposed conductive parts do not reach a dangerous potential. To provide safe path to dissipate lightning and short circuit currents. To provide stable platform for operation of sensitive electronic equipment i.
I Page: 570, earth pits for equipment and lightning should NOT be made parallel. ASSUMING A NORMAL SOIL — the salt percolates and coal absorbs water keeping the soil wet. Grain size and distribution; most of the soils are very poor conductors of electricity when they are completely dry. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, from the above calculation the GI Pipe electrode offers a much lesser resistance than even a copper plate electrode. Charcoal is highly conductive in water solution but the additive substance would reduce the resistivity of the soil, these are for what rating. It depends on the physical composition of the soil, 5 to 3 m long and 13 mm thick.
Twice the diameter of conductor is to be taken, current magnitude etc. Get access to premium electrical guides – different soil composition gives different average resistivity. Can you tell me please, remove Oxidation on joints and joints should be tightened. Its distribution and closeness of packing are also contributory factors, how does the value vary for different structures.
To maintain the voltage at any part of an electrical system at a known value so as to prevent over current or excessive voltage on the appliances or equipment . Earthing provides an alternative path around the electrical system to minimize damages in the System. There are many sources of electricity. Every transformer can be considered a separate source. If there were not a common reference point for all these voltage sources it would be extremely difficult to calculate their relationships to each other. Cast iron plate of size 600 mm x600 mm x12 mm.
Galvanized iron plate of size 600 mm x600 mm x6 mm. Plate burred at the depth of 8 feet in the vertical position and GI strip of size 50 mmx6 mm bolted with the plate is brought up to the ground level. 4 feet from the bottom of the pit. 10 feet long welded with 75 mm diameter GI flange having 6 numbers of holes for the connection of earth wires and inserted in ground by auger method.