Earthing, Types Of Earthing with Diagrams |BEE|

Summary

In this video, the presenter explains the concept of earthing in electrical engineering, highlighting its critical role in safely discharging electrical charges to the ground. The discussion covers the consequences of lacking earthing, which can lead to electric shocks during leakage events. Different types of earthing methods are detailed, including plate, pipe, rod, and strip earthing, each with specific installation procedures and materials. The video emphasizes that proper earthing protects both electrical devices and users, ensuring safety in electrical systems.

Takeaways

• 😀 Earthing is a process that transfers electrical charges directly into the ground using a low-resistance wire.
• ⚡ Without earthing, leakage current can travel through a human body, causing electric shock.
• 🔌 A three-point plug consists of a phase wire, neutral wire, and an earthing wire to ensure safety.
• 📏 The earthing wire must have lower resistance than the human body to prevent electrical shocks.
• 🕳️ Plate earthing requires digging a 3-meter deep hole, placing a galvanized iron plate, and filling it with a mixture of charcoal and salt.
• 📦 Pipe earthing involves using a galvanized steel pipe with holes, also installed in a 3-meter deep hole.
• 🔩 Rod earthing uses a solid rod instead of a pipe, following a similar installation method as pipe earthing.
• 🌍 Strip or wire earthing involves burying strip electrodes in a horizontal hole of only 0.5 meters depth.
• 📏 Different materials for strip electrodes have specific cross-section requirements for effective earthing.
• 🛡️ Proper earthing is essential for electrical safety and protecting devices from damage during leakage conditions.

Q & A

What is earthing in electrical engineering?

Earthing is the process of transferring electrical charges directly into the ground using a low-resistance wire, which is essential for safety during electrical faults.

Why is earthing important?

Earthing is important because it prevents electrical shocks by providing a safe path for leakage current to flow into the ground, rather than through a person.

What happens if there is no earthing?

If there is no earthing, any leakage current can travel through a person touching an electrical device, leading to potential electrical shock.

How does a three-point plug facilitate earthing?

A three-point plug has a phase wire that carries current, a neutral wire that returns current, and an earthing wire that directs excess current to the ground.

What are the four types of earthing mentioned in the video?

The four types of earthing are plate earthing, pipe earthing, rod earthing, and strip or wire earthing.

Describe the process of plate earthing.

In plate earthing, a hole is dug three meters deep, a galvanized iron plate is placed at the bottom, connected to a copper wire, and the hole is filled with a mixture of charcoal and salt, followed by pouring water to maintain moisture.

How is pipe earthing different from plate earthing?

In pipe earthing, a galvanized steel pipe with holes for earthing wire connections is used instead of a plate, but the overall process of installation remains similar.

What is the key difference between rod earthing and pipe earthing?

The key difference is that rod earthing uses a solid iron rod, while pipe earthing uses a hollow pipe to connect to the earthing wire.

What is the significance of using a low-resistance wire for earthing?

Using a low-resistance wire ensures that leakage current will flow through the earthing wire rather than through a person's body, reducing the risk of electric shock.

What should be the cross-section measurements for copper strip electrodes in strip earthing?

For strip earthing, the cross-section of copper strip electrodes should be 25 mm x 4 mm, while galvanized iron strips should have a cross-section of 3 mm².