PREPARED BY MD: MASUD RANA

2. Course ID: EEE-6763
Lesson No- 01
Teacher Name : Md: Masud Rana
Unit No- 02
Date: 26.07.17
Lesson Title: Electrical Earthing

3. General Objective
At the end of the lesson the students
will be able to understand the
Electrical Earthing and its working
principle .

4. Specific Objective
At the end of the lesson the students
will be able to:
 Define the earthing
Classify the earthing
 Explain the earthing
 Avoid potential rise of parts of
equipments other than the live parts.
Contribute of earthing system

5. What is Earthing
Earthing is used to protect us from an electric shock. It does this by
providing a path for a fault current to flow to earth. It also causes
the protective device to switch off the electric current to the
circuit that has the fault by help of fuse.

6. Types of Earthing
Plate Earthing
Pipe Earthing
Rod Earthing
Strip Earthing
Earthing through Water Mains

7. Component of Earthing System

8. Why Need It
 protect human lives as well as provide safety to
electrical devices and appliances from leakage current.
 To keep voltage as constant in the healthy phase (If
fault occurs on any one phase).
 To protect electric system and buildings form lighting.
 To serve as a return conductor in electric traction
system and communication.
 Avoid the risk of fire in electrical installation systems.
 To get earth’s healing energy.

9. Application
• Telecommunication
• Transmission
• Substations & Power Generations
• Transformer Neutral earthing
• Lightning Arrestor Earthing
• Equipment Body Earthing
• Water Treatment Plants
• Heavy Industries
• College, Hospitals, Banks
• Residential Building

10. Summary
Earthing systems form the first line of defense in
every type of electrical systems.
The system may be a generator/transformer/
housing installation/generating station/etc.
So it is strictly advised to know the basic concepts
of grounding as far as electrical engineering is
concerned.

11. Review
 Objective
What is Earthing
Types of Earthing
Component of Earthing System
Why Need It
Application

12. Evaluation
1. What is Earthing?
2. Why It’s important?
3. Draw the figure component of
Earthing?