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What are the advantages of a good earth resistance value for an electrical system?
Wiki User
∙ 9y ago
A good earth resistance value for an electrical system implies that, any persons making direct physical contacts with it are more secure from hurtful electrical current leakages that may, by fault, flow through it's outer metallic parts, and the system itself and the persons are again more secure from lightning heavy currents that might strike the system.
Wiki User
∙ 9y ago
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What should be the earth resistance of a good earth?
The lower the resistance you get in the grounding/earth system the better. In offshore a resistance from 1-2 ohm is a good earthing system. In Onshore a miximum of 10ohm is acceptable.
What is electrical earth leg?
It is the ground line of the system or electrical leg that is going to the earth.
What instrument measures electrical earth resistance?
A multimeter device can measure resistance, current, AC/DC voltage, and it also can determine continuity on an electrical circuit, and its range for current, voltage and resistance is widely variable.
How does lighting arrester working?
A lightning arrester (or lightning rod) works by providing a low resistance path to earth. This directs a lightning strike down the side of a building instead of it spreading through the electrical system.
What does a megohmeter or megger test?
It checks resistance from a circuit or an electrical component to earth, to make sure it is electrically isolated. This must be a very high value of resistance, hence 'megohms'.
How Earth resistance meter works?
There are 3 terminals of an Earth Tester meter. Connect two terminals of meter to earth as far as cables can. Fix the two rods in to soil with the help of a small Hammer. Then connect two knobs of the meter with these rods.Connect the third terminal to the Earth Pit,to whom earth resistance is to be measured. The meter reading will indicate the resistance of the earth pit.The Best resistance of an earth pit must be under unity(<1). Answer BY: Naeem Ahmad Electrical Engineer.
What does the two terminal test method measure?
Measures the resistance to earth from a grounding system
How do you install an earthing system for telecom?
make separate earth pits far from the electrical system earth pits and test to have low resistivity then connect the system or tower.
State two advantages of chassis earth return system?
ur mem
What is the function of neutral in electrical system?
See related link. The neutral wire provides the electric current a return path back to the electrical generation system. It is connected to earth ground, and should have no electric potential in relation to earth ground.
Why is grounding important?
Every electrical system should be earthed to get a low resistance path for dissipation of current into the earth. Major accidents take place because of improper equipment earthing or leakage current. Earth fault current directly affect the human safety. Earthing should be measured at regular intervals so as to ensure that the resistance of the earth is maintained minimum. Its main purpose is to minimize the risks of fire and shock hazards.
What is mean by earth resistance tester?
I think it measures characteristics of soil to determine its suitability underneath a plant or substation. One way to measure resistance of the earth is with four conductors in a straight line -- the two outer ones inject a current, and the two center ones measure the voltage. From these two known quantities and Ohm's Law, R=V/I gives the resistance. Earth is not a great "earth," and electrical equipment and building designers strive for a resistance of one ohm. The earth seldom rarely complies with this.
