Podcast
Questions and Answers
Which of the following is NOT a type of earthing?
Which of the following is NOT a type of earthing?
- Plate earthing
- Pipe earthing
- Rod earthing
- Wire earthing (correct)
What does the term 'earth fault loop' refer to?
What does the term 'earth fault loop' refer to?
- The loop created by the grounding wire and the ground itself
- A loop in the wiring system that prevents electrical shock
- The path of electricity from a live wire to the ground through a fault (correct)
- A closed circuit where the earth wire is used as a return path for current
How does earthing protect against electric shock?
How does earthing protect against electric shock?
- By creating a path for current to flow to the ground in case of a fault (correct)
- By reducing the voltage of the electrical system
- By preventing electrical currents from flowing to the ground
- By isolating the electrical system from the ground
What is the difference between step voltage and touch voltage?
What is the difference between step voltage and touch voltage?
What factor primarily determines the severity of an electric shock?
What factor primarily determines the severity of an electric shock?
Flashcards
Electric Shock
Electric Shock
The physiological reaction when electric current passes through the body.
Types of Contact
Types of Contact
The ways a person can come into contact with electrical sources.
Protection Against Electric Shock
Protection Against Electric Shock
Methods and devices designed to prevent or reduce the effects of electric shock.
Forms of Earthing
Forms of Earthing
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Step and Touch Voltages
Step and Touch Voltages
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Study Notes
Electric Shock
- Electric shock occurs when a current passes through the body.
- Different types of contact include direct contact, indirect contact, and contact with energized parts.
- Shock intensity depends on factors like current magnitude, path through the body, and duration of exposure.
- Higher currents cause more severe effects (e.g., burns, cardiac arrest).
Protection Against Electric Shock
- Protective measures are essential to prevent electric shock.
- These include safety devices (such as fuses and circuit breakers), insulation, and proper earthing procedures.
- Various safety standards and regulations exist to ensure employee safety.
Forms of Earthing
- Earthing provides a low-resistance path for fault currents to flow to the ground.
- Essential to prevent dangerous voltages on equipment.
- Different methods of earthing include plate earthing, rod earthing, and strip earthing.
Earth Fault Loop
- Earth fault loop impedance (or resistance) is critical.
- Low impedance is a desirable characteristic.
- A low value will quickly detect and isolate faults, limiting the risk of shock.
Step and Touch Voltages
- Step voltage occurs when a person steps across a potential difference in the ground.
- Touch voltage occurs when a person touches an energized object.
- Both types of voltages can lead to shock.
- Proper earthing and grounding procedures are essential to limit the risk.
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Description
This quiz covers essential information about electric shock, including its causes, types, and safety measures to prevent it. Learn about the importance of earthing and various protection methods against electric hazards. Test your knowledge on safe practices and standards in electrical safety.
