Electrical Hazards and Safety Controls
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Questions and Answers

What was a major contributing factor to the incident involving the worker and the overhead powerline?

  • The boom truck operator's view might have been obstructed. (correct)
  • A signaler was used effectively during the procedure.
  • The company had designated a safe unloading area.
  • The worker was wearing appropriate personal protective equipment.

Which electrical hazard type involves the danger of electricity entering the human body?

  • Electrical fires.
  • Arcing incidents.
  • Overloading circuits.
  • Electrical shock. (correct)

What should a company ensure to prevent incidents like the one involving the apprentice and the electrical panel?

  • Regularly update equipment to the latest technology.
  • Provide appropriate safety training and supervision. (correct)
  • Limit access to the electrical panels only to apprentices.
  • Ensure all panels are kept permanently de-energized.

What was a neglectful practice that led to the apprentice's fatal injury?

<p>The electrical panel had been left energized. (B)</p> Signup and view all the answers

Which of the following mechanisms describes how electrical shock can occur?

<p>A person touches a grounded object while standing on a wet surface. (C)</p> Signup and view all the answers

Which human factor was identified as a contributor to the worker’s shock incident?

<p>Lack of a signaler to guide the unloading process. (C)</p> Signup and view all the answers

What can be a consequence of even mild electrical shock?

<p>Temporary loss of muscle strength and cognitive function. (A)</p> Signup and view all the answers

What is one of the main types of electrical hazards that can cause serious property damage?

<p>Electrical fires. (A)</p> Signup and view all the answers

What is a significant consequence associated with electrical accidents?

<p>High costs in property damage (D)</p> Signup and view all the answers

Which of the following is NOT a type of electrical hazard?

<p>Chemical burns (C)</p> Signup and view all the answers

What is the primary cause of electrical incidents?

<p>Human error or activity (C)</p> Signup and view all the answers

How does the injury-to-fatality ratio of electrical incidents compare to other occupational injuries?

<p>It is lower than 755 to 1 (D)</p> Signup and view all the answers

Which statistic indicates the severity of injuries from electrical incidents?

<p>1 fatality for every 15 non-critical injuries (B)</p> Signup and view all the answers

What type of loss is particularly high as a result of electrical incidents in Canada and the United States?

<p>Financial property loss (C)</p> Signup and view all the answers

Which statement best describes the relationship between electricity and safety in engineering?

<p>Understanding electrical hazards is essential for ensuring user safety. (B)</p> Signup and view all the answers

What does the term 'hierarchy of controls' refer to in relation to electrical hazards?

<p>Different levels of safety measures to mitigate hazards (C)</p> Signup and view all the answers

What is defined as the flow of current through an insulating medium that is accompanied by light, heat, and sound?

<p>Arcing (B)</p> Signup and view all the answers

Which of the following factors does NOT contribute to the intensity of an arcing incident?

<p>Environmental temperature (A)</p> Signup and view all the answers

What can happen to a person standing several feet away from an arc flash?

<p>They can suffer severe burns (C)</p> Signup and view all the answers

At what temperature can an electric arc potentially reach?

<p>20,000°C (C)</p> Signup and view all the answers

What is the main cause of electrical fires?

<p>Improper use or poor maintenance of electrical equipment (D)</p> Signup and view all the answers

Why do electrical fires occur more frequently in homes than in commercial or industrial facilities?

<p>Because of outdated wiring practices (D)</p> Signup and view all the answers

What severe consequence can occur from inhaling vapour produced by an arc blast?

<p>Respiratory burns (D)</p> Signup and view all the answers

What is a common cause of arcing that can lead to electrical fires?

<p>Improper or damaged electrical terminations (D)</p> Signup and view all the answers

What is over-fusing in electrical systems?

<p>Using a fuse with higher ampacity than needed (B)</p> Signup and view all the answers

Which method is considered the most effective in controlling electrical hazards?

<p>Elimination (D)</p> Signup and view all the answers

Which principle of inherent safety involves using a less hazardous form of a material?

<p>Substitution (C)</p> Signup and view all the answers

What is an example of an engineering control for managing electrical hazards?

<p>Using the correct fuse for a circuit (B)</p> Signup and view all the answers

What type of control would prohibit the use of extension cords in an organization?

<p>Administrative controls (C)</p> Signup and view all the answers

Which of the following is NOT an example of personal protective equipment?

<p>Safety signage (D)</p> Signup and view all the answers

Which hierarchy of controls focuses on modifying processes to eliminate high voltage requirements?

<p>Elimination (A)</p> Signup and view all the answers

What does moderation as an inherently safer design principle involve?

<p>Employing a less hazardous form of the existing hazard (C)</p> Signup and view all the answers

Flashcards

Electrical Hazards

Dangerous situations involving electricity that can cause harm to people or property.

Types of Electrical Hazards

There are three main types of electrical hazards: electrical shock, arcing and electrical fires.

Electrical Shock

A sudden discharge of electricity through a person's body, causing a painful sensation or serious injury.

Arcing

An electric discharge across a gap between two conductors, often causing intense heat and light.

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Electrical Fires

Fires caused by electrical malfunctions or misuse of electrical equipment.

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Hierarchy of Controls

A system of different methods to control hazards, starting with the most effective and safest measures.

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Elimination (Hierarchy of Controls)

Completely removing the hazard - the most effective method for preventing electrical incidents.

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Substitution (Hierarchy of Controls)

Replacing a hazardous electrical component with a safer alternative.

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Direct Contact (Electrical Hazard)

When a person touches an energized conductor or surface, allowing electrical current to flow through them.

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Step/Touch Potential (Electrical Hazard)

When there's a voltage difference between the feet of a person standing near an energized grounded object, leading to current flowing through the body.

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Reverse Polarity (Electrical Hazard)

The hot and neutral wires in a receptacle are reversed, leading to potential shock hazards.

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Arcing Incident (Electrical Hazard)

An electric arc occurs when electricity jumps between conductors, creating a high temperature and potential for burns and fires.

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Electrical Fire (Electrical Hazard)

A fire ignited by an electrical malfunction, often caused by faulty wiring, overloading circuits, or arcing.

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Human Factors in Electrical Incidents

Factors related to human behavior that increase the risk of electrical incidents, such as: Lack of training, inadequate safety procedures, disregard for safety policies, and faulty judgment.

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Controlling Electrical Hazards

Minimizing risks by implementing safety measures like: Proper insulation, grounding, lockout/tagout procedures, and personal protective equipment.

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What is an electrical arc?

A flow of electric current through an insulating material, creating light, heat, and sound. Think of it as a sudden, intense spark.

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What is an arc blast?

The explosive expansion of air and metal caused by the extreme heat of an electrical arc. It's like a mini-explosion.

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What is incident energy?

The amount of electrical energy released during an arc flash incident. It determines the severity of the burn.

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How does an arc flash affect the body?

The intense heat from an arc flash can cause severe burns, ignite clothing, and even damage the respiratory system.

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What factors influence the severity of an arc flash?

Factors like the size of the transformer, impedance, voltage, current, duration of the fault, and distance from the source all contribute to the severity of an arc flash.

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What are the main causes of electrical fires?

Electrical fires are often caused by arcing (improper terminations/conductors) and overheating (wiring overloaded beyond capacity).

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How do wiring alterations contribute to electrical fires?

Changes to older wiring without proper inspection can lead to overloading and overheating, increasing the risk of fire.

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Why are electrical fires more common in homes?

Electrical fires are more common in homes because they often have older wiring and are more likely to have alterations made without professional inspection.

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Over-fusing

Using a fuse with a higher ampacity than the circuit is designed for, potentially leading to overheating and fire hazards.

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Overheating of Extension Cords

Using extension cords excessively or incorrectly, especially in older buildings, can result in overheating and fire hazards due to inadequate wire gauge and overloading.

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Inherent Safety (Minimization)

Designing a system to reduce the amount of hazard present, minimizing the risk of electrical incidents.

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Inherent Safety (Substitution)

Replacing a hazardous electrical component with a safer alternative, like using a different power source or material.

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Inherent Safety (Moderation)

Using a less hazardous form of electricity, such as lower voltage or frequency.

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Inherent Safety (Simplification)

Designing a foolproof system that's easy to operate and prevents accidental electrical contact.

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Engineering Controls (Example)

Using the correct fuse for a specific circuit as a preventative measure against electrical hazards.

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Administrative Controls (Example)

Implementing policies that restrict or prohibit the use of potential hazards, such as unsafe extension cords or multi-plug adapters.

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Study Notes

Electrical Hazards and Controls

  • This module is about the dangers of electricity and control measures
  • The learning objectives are to identify dangers associated with electricity, describe the main types of electrical hazards, and explain the hierarchy of controls for electrical hazards
  • Electricity is essential to modern life but also dangerous
  • Electrical accidents cause significant property damage, injuries, and loss of life.
  • Electrical hazards include electrical shock, arcing, and electrical fires
  • Electrical incidents often stem from human error or inadequate safety practices.
  • Electrical accidents are costly, with annual figures in Canada and the US indicating substantial property damage, injuries, and deaths.
  • Electrical shock occurs when electricity enters the human body, completing a circuit. Currents under one amp can be fatal.
  • Arcing is a flow of current through an insulating medium (air) accompanied by light, heat, and sound.
  • Electrical fires are a common cause of fatalities related to electrical incidents. They result from misuse and poor maintenance of electrical equipment, rather than faulty design.
  • Electrical fires often result from arcing and overheating.
  • Causes of electrical fires include faulty outlets, old wiring, overloaded circuits, and short circuits.
  • The hierarchy of controls is a method for managing risks, with five steps: elimination, inherent safety, engineering controls, administrative controls, and personal protective equipment.
  • Elimination is the most effective control, removing the hazard altogether.
  • Inherent safety involves designing equipment to minimize or exclude hazards.
  • Engineering controls use physical barriers or tools to reduce exposure to hazards (e.g., safety equipment for jobs that are dangerous)
  • Administrative controls affect how the work is done to prevent accidents (e.g., training, procedures, rules).
  • Personal protective equipment (PPE) is the least effective control, providing safety gear for workers (e.g., insulated gloves).
  • Electrical hazards can be controlled through proper awareness, appropriate preventative measures, and safe work practices.

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Related Documents

Week 4 Electrical Hazards and Controls PDF

Description

This quiz explores the dangers associated with electricity and the control measures that can prevent electrical accidents. Participants will learn to identify different types of electrical hazards such as shock, arcing, and fires, as well as the importance of safety practices to mitigate risks. Understanding these concepts is essential for maintaining safety in environments where electricity is used.

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