Safety rules and earthing
-
Upload
nik1020 -
Category
Engineering
-
view
39 -
download
1
Transcript of Safety rules and earthing
![Page 1: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/1.jpg)
Elements of Electrical Engineering presentation
Topic: - Earthing & Electrical safety
By Nikhil Pandit
CE A
A1
Enrollment no.:-130120107057
![Page 2: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/2.jpg)
Earthing AND ELECTRICAL SAFETY
![Page 3: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/3.jpg)
Concept of Earthing Systems
All the people living or working in residential, commercial and industrial places, particularly the person who are close with electrical systems and machineries, should essentially be protected against possible electrification.
![Page 4: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/4.jpg)
What Is Earthing? The process of connecting metallic bodies of all the electrical apparatus and equipment to huge mass of earth by a wire having negligible resistance is called Earthing.
![Page 5: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/5.jpg)
Grounding
There are two kinds of grounding:
• 1. Electrical circuit or system grounding
• 2. Electrical equipment grounding
![Page 6: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/6.jpg)
Electrical System Grounding • One conductor of the
circuit is intentionally grounded to earth
• Protects circuit from lightning, or other high voltage contact
![Page 7: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/7.jpg)
Equipment Grounding
• All metal frames & enclosures of equipment are
grounded by a permanent connection or bond
![Page 8: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/8.jpg)
Qualities Of Good Earthing
• Must be of low electrical resistance
• Must be of good corrosion resistance
• Must be able to dissipate high fault current repeatedly
![Page 9: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/9.jpg)
Effects of Amount of AC Current3 ma- painful shock which
cause indirect accidents
10ma- muscle contraction...”no let go” danger
30ma- lung paralysis- usually temporary
50ma- possible ventricular fibrillation (heart dysfunction, usually fatal)
100 ma-4amps- certain ventricular fibrillation(heart fail), fatal
4 amps- heart paralysis, severe burns
![Page 10: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/10.jpg)
A FACT OF ELECTRICAL HAZARDS
![Page 11: Safety rules and earthing](https://reader035.fdocuments.in/reader035/viewer/2022081420/55c3cd3dbb61eb065d8b481a/html5/thumbnails/11.jpg)
Thank you