Understanding Grounding: Shock Risks in Electrical Systems Explained

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Discussion Overview

The discussion revolves around the risks of electric shock in a circuit where one side is grounded and the other is not. Participants explore the implications of grounding in electrical systems, particularly in relation to AC voltage sources and the conditions under which a person might receive a shock.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether touching the ungrounded side of a wire would result in a shock, considering the other side is grounded.
  • Another participant requests clarification on the electrical source, including its voltage and whether it is AC or DC.
  • A participant hypothesizes about the scenario using a high voltage AC source and compares it to the experience of using a Van de Graaff generator, suggesting uncertainty about the outcome.
  • One participant explains that current has two paths to ground, indicating that the lower impedance path (the grounded wire) would likely carry most of the current, thus reducing the risk of shock to a person touching the ungrounded wire.
  • This explanation draws a parallel to safety grounds on metal chassis of electrical devices, emphasizing the importance of grounding in preventing electric shock.

Areas of Agreement / Disagreement

Participants express differing views on the conditions under which a shock might occur, with some proposing that grounding reduces risk while others remain uncertain about the specifics of the scenario.

Contextual Notes

Participants have not provided specific details about the electrical source, such as its exact voltage or frequency, which may affect the discussion's conclusions. There is also a lack of consensus on the implications of grounding in this context.

Who May Find This Useful

This discussion may be of interest to individuals studying electrical engineering, safety protocols in electrical systems, or those curious about the principles of grounding and electric shock risks.

fable
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I have a system with an electrical source in the centre. the circuit branches off to two sides, one side is grounded, the other is not, if I were to touch the not grounded side of this wire, would I receive a shock? Or would I be perfectly fine because it's grounded at the other end?
 
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fable said:
I have a system with an electrical source in the centre. the circuit branches off to two sides, one side is grounded, the other is not, if I were to touch the not grounded side of this wire, would I receive a shock? Or would I be perfectly fine because it's grounded at the other end?

Welcome to the PF.

Could you please show us a sketch of what you mean? What is the electrical source? What voltage, DC or AC, if AC, what frequency?
 
Thanks very much, and here's how i see it.

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I was thinking - in the most simplistic way possible using something similar to that. Let's say the source is AC, high voltage say... 100V? the source, I'm not sure it was just a hypothetical "what if" question that I couldn't really make my mind up on the outcome.

Would it be the same essentially as holding a vandergraph generator and then touching someone? ie. that the there would be no shock felt until there was contact made? Or am i completely wrong here?
 
All points on a wire are essentially connected if you look at the big picture of circuit analysis.

What happens if you grab the open wire is that the current flowing from the source has two paths to ground. One path is a wire directly to ground and the other path is through you. The path directly to ground will be lower impedance so most of the current will flow through that wire instead of through you to ground so you would not get shocked.

This is the same reason there are safety grounds on metal chassis of electrical devices. If there ever was a short where power was put on the chassis, the current would flow through the safety ground and not through a person who touched the chassis.
 

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