Safety Regulations for Electrical Work
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Questions and Answers

What is the minimum safe distance a worker should maintain from overhead power lines?

  • 5 ft
  • 20 ft
  • 15 ft
  • 10 ft (correct)

Which type of ladders can be safely used near overhead power lines?

  • Plastic ladders
  • Metal ladders
  • Wood or fiberglass ladders (correct)
  • Aluminum ladders

What is the purpose of a power line proximity warning device?

  • To lower the boom rapidly
  • To insulate the boom from electrical power
  • To increase the voltage of the power line
  • To notify the operator if the boom is too close to a power line (correct)

What happens as the length of a wire of a given cross-section increases?

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

What characteristic defines intrinsically safe electrical equipment?

<p>It has limited energy to prevent ignition (C)</p> Signup and view all the answers

What should be done when electrical equipment is located in a 'people' zone?

<p>Protect with shields, conduit, and barriers (B)</p> Signup and view all the answers

What is a common limitation of wire size in electrical applications?

<p>Each gauge has a recommended maximum length to ensure safety (D)</p> Signup and view all the answers

What is the flash point range for combustible liquids?

<p>Between 100°F and 200°F (D)</p> Signup and view all the answers

Which class of materials has a flash point less than 100°F?

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

What defines a pyrophoric liquid?

<p>Ignites spontaneously at or below 130°F (B)</p> Signup and view all the answers

Which of the following substances is classified as an oxidizer?

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

What is the definition of a poison A?

<p>Extremely dangerous poisonous gases or liquids (B)</p> Signup and view all the answers

What is the primary purpose of emergency actions in an incident?

<p>To mitigate the severity of an incident (B)</p> Signup and view all the answers

What defines an atmospheric tank?

<p>A storage tank operating at atmospheric pressure to 0.5 psig (B)</p> Signup and view all the answers

Which of the following best describes a catastrophic release?

<p>An uncontrolled emission involving a highly hazardous chemical (D)</p> Signup and view all the answers

What is meant by 'replacement in kind'?

<p>A replacement that satisfies the design specification (A)</p> Signup and view all the answers

Which characteristic does a highly hazardous chemical NOT possess?

<p>Non-reactive properties (B)</p> Signup and view all the answers

Which of the following teams may be required during emergency actions?

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

What does 'normally unoccupied remote facility' refer to?

<p>A facility with no employees permanently stationed (D)</p> Signup and view all the answers

What is a trade secret?

<p>A confidential formula or information used for competitive advantage (B)</p> Signup and view all the answers

What is the purpose of using personal protective equipment (PPE)?

<p>To ensure safety during hazardous activities (A)</p> Signup and view all the answers

What actions can emergency actions include?

<p>Treatment and recovery operations (D)</p> Signup and view all the answers

What is the maximum distance for grounding protection over 500V?

<p>35 (A)</p> Signup and view all the answers

Which of the following is a common effect of electrical hazards?

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

What voltage is considered low-voltage equipment?

<p>24V (D)</p> Signup and view all the answers

What property of a material is capacitance measured in?

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

How much energy in joules does a spark from static electricity release when a person walks on carpet?

<p>0.125 J (C)</p> Signup and view all the answers

What is a primary function of Smart Power Integrated Circuits (PIC)?

<p>To prevent unauthorized current flow (A)</p> Signup and view all the answers

Which of the following can produce static electricity?

<p>Walking on dry carpet (A)</p> Signup and view all the answers

What is the approximate capacitance for a person in farads?

<p>100 pF (D)</p> Signup and view all the answers

What minimizes the buildup of static charge in an environment?

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

What is the primary cause of fatigue failure in materials?

<p>Repeated stress cycles leading to cracks (A)</p> Signup and view all the answers

Which factor contributes to creep in materials?

<p>Slow loading over time (A)</p> Signup and view all the answers

What is the role of moisture in the corrosion of buried LPG pipework?

<p>It creates an electro-chemical reaction with soil contaminants. (C)</p> Signup and view all the answers

What is tuberculation in the context of pipeline corrosion?

<p>The buildup inside a pipeline caused by bacterial reactions with iron. (C)</p> Signup and view all the answers

Which method is NOT effective for protecting against corrosion?

<p>Exposing the pipe to environmental elements (D)</p> Signup and view all the answers

What are corrosion cells primarily concerned with?

<p>Electronic transfer between anodes and cathodes. (A)</p> Signup and view all the answers

What is the consequence of poor or faulty workmanship in structural design?

<p>Improper assembly leading to potential failure (A)</p> Signup and view all the answers

What causes the area of high stress concentration in materials?

<p>Existence of corners, threads, and holes. (A)</p> Signup and view all the answers

What is a potential result of inadequate support in a structure?

<p>Structural failure due to insufficient load capacity (D)</p> Signup and view all the answers

What is the impact of cyclical loading on material fatigue?

<p>It causes gradual accumulation of material stress. (D)</p> Signup and view all the answers

Flashcards

Overhead Power Lines

Overhead power lines are not typically insulated, meaning they carry electrical current without a protective covering. This makes them potentially dangerous, and safety precautions must be taken.

Power Line Boundaries

Demarcating boundaries around energized power lines is crucial for safety. These boundaries can be defined by flags, warning devices, or designated work zones, and they prevent workers from getting too close to the lines.

Work Zone Around Power Lines

A work zone around energized power lines is defined as the area 360 degrees around the equipment. This area must be kept clear of workers and other equipment.

Power Line Distance

The distance a worker must stay away from an energized power line is related to the voltage of the line. Higher voltage lines require a greater distance for safety.

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Crane Insulation

Special devices can be used to isolate cranes and booms from electrical power lines, preventing dangerous electrical contact. These devices protect workers and equipment.

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Limit Switches

Limit switches are safety devices installed on hoists and cranes to prevent the load from exceeding the safe operating limits. They help ensure safe operation and prevent accidents.

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Wire Length and Resistance

The length of a wire is directly related to its resistance. A longer wire of the same gauge will have higher resistance, leading to increased heat during current flow.

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Double Insulation (Class II)

A type of electrical equipment that has extra protection to prevent electric shocks, typically by providing an additional layer of insulation.

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Low-Voltage Equipment

A type of electrical equipment that operates at a very low voltage, typically below 24 volts, to reduce the risk of electrical hazards.

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Safe Distance for High Voltage

The distance that should be maintained between someone and a source of high voltage electricity to ensure safety.

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Cardiopulmonary Resuscitation (CPR)

A life-saving technique used to restore breathing and circulation in the event of a cardiac arrest.

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Smart Power Integrated Circuits (PICs)

Small electrical circuits designed to control the flow of electricity and prevent hazards by recognizing and only allowing authorized devices to receive power.

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Static Electricity

A buildup of electrical charge on a material's surface due to friction or movement, often creating a spark when discharged.

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Static Electricity Spark Discharge

Sparks caused by the discharge of static electricity, which can ignite flammable vapors or dust, posing a fire hazard.

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Static Electricity Controls

Measures taken to reduce or eliminate the accumulation of static electricity, minimizing the risk of spark discharge.

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Capacitance

The ability of a material to store electrical energy, measured in Farads.

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Atmospheric Tank

A tank designed to operate at pressures ranging from atmospheric to 0.5 psig (pounds per square inch gauge).

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Boiling Point (14.7 PSI)

The boiling point of a liquid at a standard pressure of 14.7 PSI absolute.

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Catastrophic Release

A major uncontrolled release of hazardous chemicals causing potential danger to workers.

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Highly Hazardous Chemical

Any substance with toxic, reactive, flammable, or explosive properties that can pose risks in the workplace.

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Normally Unoccupied Remote Facility

A facility where no employees are permanently stationed.

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Process (Hazardous Chemicals)

Any activity involving highly hazardous chemicals including use, storage, manufacturing, handling, or movement.

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Replacement in Kind

A replacement that meets the original design specifications.

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Trade Secret

Confidential information that gives a company an advantage over competitors.

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Emergency Actions

Measures limiting exposure of people, property, and the environment during incidents.

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Cleanup Areas, Locker Rooms, and Showers

Areas for cleaning, changing clothes, and showering, crucial for maintaining hygiene and safety.

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Plasticity

The ability of a material to deform permanently under stress.

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Cold Work Hardening

The process of a material becoming harder and stronger when deformed at low temperatures.

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Fatigue Failure

A type of material failure caused by repeated stress cycles, leading to cracks and eventual breakage.

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Beachmarks

Marks on a fatigue fracture surface that resemble the coastline, indicating the crack growth direction.

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Creep

A slow but permanent deformation of a material under a constant load, especially at high temperatures.

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Corrosion

A deterioration of a material due to chemical reactions with its environment, often involving the formation of rust or corrosion products.

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Tuberculation

A type of internal corrosion in pipes caused by bacteria reacting with iron, leading to a buildup inside the pipe.

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Protective Coating

Protecting a material from corrosion by applying a protective coating.

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Sacrificial Anode

Protecting a material from corrosion by using a less-reactive metal that sacrifices itself to protect the main material.

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Overloading

A failure caused by a structural element not having enough load-carrying capacity, leading to collapse or deformation.

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Pyroforic Liquid

A liquid that ignites spontaneously in air at or below 130°F (54.4°C).

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Flammable Liquid

A liquid with a flash point below 100°F (37.8°C), readily igniting in the presence of a spark or flame.

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Flammable Solid

A solid that ignites easily and burns persistently, creating a serious fire hazard during transport.

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Corrosive Material

Any liquid or solid that causes visible damage to human skin or corrodes steel, requiring special handling and protection.

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Oxidizer

A substance like chlorate, permanganate, or nitrate that releases oxygen, accelerating the burning of organic materials.

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Study Notes

Electrical Basics

  • Voltage is the difference in charge between two points
  • Current is the rate at which charge flows
  • Resistance is a material's tendency to resist current flow

Ohm's Law

  • V = I x R, where V is voltage (volts), I is current (amperes), and R is resistance (ohms)
  • 1 Ampere = 1 Coulomb

Series Circuits

  • Components are connected along a single path.
  • The same current flows through all components

Parallel Circuits

  • Electrical current to each element is separate.
  • If one element fails, others still function.

Direct Current (DC)

  • Unidirectional flow of electric charge
  • Current flows in the same direction constantly

Alternating Current (AC)

  • Electric charge periodically reverses direction.
  • Current values periodically change between positive and negative values.

Resistance in a Series Circuit

  • Rseries = R1 + R2 + ... + Rn

Resistance in a Parallel Circuit

  • 1/Rt = 1/R1 + 1/R2 + ... + 1/Rn

Voltage in AC Circuits

  • V = √(P/cosФ) where V is voltage, P is true power, and Ф is the phase angle in degrees.

Power in DC Circuits

  • P = VI
  • P =I²R
  • P = V²/R where P is power (watts), V is voltage (volts), and I is current (amperes), and R is resistance (ohms)

Power in AC Circuits

  • P = V I cosФ.

Joule's Law

  • P = I²R = IV = V²/R
  • where 'P' is electrical power (watts), 'I' is current (amperes), 'V' is voltage (volts), and 'R' is resistance (Ω)

Capacitors/condensers

  • Passive components with two conductors separated by a dielectric.
  • Store energy in the electric field.
  • Measured in farads (F).

Capacitance in a Series Circuit

  • 1/Ct = 1/C1 + 1/C2 + ... + 1/Cn

Capacitance in a Parallel Circuit

  • Cparallel = C1 + C2 + ... + Cn

Oscillators

  • Electronic circuits producing high-frequency alternating currents

Thermocouples

  • Sensors measuring temperature, converting heat into electrical energy

Inductors

  • Passive components storing energy in a magnetic field.
  • Measured in henries (H).

Electrical Shock Hazard

  • Severity of injury depends on the electric current's magnitude and duration, body resistance, and the current path through the body.
  • 5 mA: Slight shock, not painful
  • 6-25 mA: Painful shock, loss of muscular control
  • 50-150 mA: Freezing current (cannot let go), life threatening

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Domain 4 - Advanced Application of Key Safety Concepts PDF

Description

Test your knowledge on essential safety regulations related to electrical work. This quiz covers topics such as minimum safe distances from power lines, types of ladders that can be used near hazards, and definitions of hazardous materials. Ensure you understand the key safety measures to prevent incidents in the workplace.

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