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Earthing in Electrical Systems

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Questions and Answers

What is the purpose of plate earthing?

To provide a low resistance path for the dissipation of fault current to the ground

What materials are commonly used for plate earthing?

Galvanized iron or copper

How is rod earthing accomplished?

By burying a copper rod or galvanized steel/iron pipe vertically underground

What is the purpose of earthing through the water main?

To use the water main pipe for earthing and minimize resistance for earthing connection Signup and view all the answers

What is the function of charcoal and salt in earthing?

Charcoal maintains humidity and increases conductivity, while salt reduces the resistance to the dissipation of electricity Signup and view all the answers

What is the purpose of earthing in electrical systems?

To protect the operating personnel, maintain line voltage constant, protect equipment, and protect buildings and machines against lightning. Signup and view all the answers

What is the difference between earthing and grounding?

Earthing protects humans from electrocution and contains zero potential, while grounding protects the entire power system from malfunctioning and does not possess zero potential. Signup and view all the answers

How does earthing protect against damage to electrical systems and equipment?

The leakage current chooses a simple low resistance path to flow, protecting the electrical system and equipment from damage. Signup and view all the answers

What is the significance of the color of the wires used in earthing and grounding?

The earth wire used in earthing is green in color, while the wire used for grounding is black in color. Signup and view all the answers

What are the four main necessities of earthing in electrical systems?

To protect operating personnel, maintain line voltage constant, protect equipment, and protect buildings and machines against lightning. Signup and view all the answers

What is the zero potential referred to in earthing?

The ground Signup and view all the answers

What is the main purpose of grounding in the context of electric systems?

To protect the entire power system from malfunctioning Signup and view all the answers

How does earthing protect electrical systems and equipment?

By providing a low resistance path for leakage current to flow directly to the ground Signup and view all the answers

Under what condition is grounding primarily used?

Unbalancing when the electric system overloads Signup and view all the answers

What is the color of the wire used for grounding?

Black Signup and view all the answers

What are the dimensions for a galvanized iron plate used in plate earthing?

60cmX60cmX6.35mm Signup and view all the answers

What is the diameter of the pipe used in pipe earthing for normal soil?

40mm Signup and view all the answers

What is the minimum depth of the trench for burying the strip electrode in strip or wire earthing?

0.5m Signup and view all the answers

What is the diameter of the copper rod used in rod earthing?

12.5mm Signup and view all the answers

What is the purpose of using earthing clamps in earthing through the water main?

To minimize the resistance for earthing connection Signup and view all the answers

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