Electrical earthing and safety is important to protect people and equipment from high voltages and electrical accidents. Earthing is the process of connecting metallic electrical systems to the earth through wires to divert high voltages safely to the ground. There are two types of grounding: electrical circuit grounding, which protects circuits from lightning by grounding one conductor; and equipment grounding, which grounds all metal frames and enclosures. A good earthing system must have low resistance, resist corrosion, and dissipate high fault currents without damage. Untreated electric shocks as low as 3 milliamps can cause accidents, while over 50 milliamps can cause heart fibrillation. Proper earthing and grounding is vital for electrical safety

1. Elements of Electrical Engineering
presentation
Topic: - Earthing & Electrical safety
By Nikhil Pandit
CE A
A1
Enrollment no.:-130120107057

2. Earthing AND
ELECTRICAL SAFETY

3. 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.

4. 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.

5. Grounding
There are two kinds of grounding:
• 1. Electrical circuit or system grounding
• 2. Electrical equipment grounding

6. Electrical System
Grounding • One conductor of the
circuit is intentionally
grounded to earth
• Protects circuit from
lightning, or other high
voltage contact

7. Equipment Grounding
• All metal frames & enclosures of equipment are
grounded by a permanent connection or bond

8. 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

9. Effects of Amount of AC
Current3 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

10. A FACT OF ELECTRICAL
HAZARDS

11. Thank you