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Questions and Answers

What is a primary purpose of interlocking doors in machine safety?

  • To prevent electrical shocks
  • To prevent physical access to moving parts (correct)
  • To improve machine efficiency
  • To reduce noise levels

    • What is a potential consequence of electrical faults in a workplace?

  • Electrical surge
  • Machine breakdown
  • Fire or explosion (correct)
  • Increased productivity

    • What is the primary purpose of intrinsically safe electrical devices?

  • To limit electrical energy to prevent ignition (correct)
  • To provide high voltage power
  • To prevent electrical shocks
  • To reduce energy consumption

    • What is a common effect of electrical shock?

    <p>Burns and shocks</p> Signup and view all the answers

    What is a necessary component of machine safety protocols?

    <p>All of the above</p> Signup and view all the answers

    What is a benefit of conducting a risk assessment on handling equipment/machinery?

    <p>To identify potential hazards</p> Signup and view all the answers

    What is a critical component of electrical safety protocols?

    <p>All of the above</p> Signup and view all the answers

    What is a potential source of ignition in a flammable atmosphere?

    <p>Static electricity</p> Signup and view all the answers

    What is the purpose of ensuring everything is okay before powering up a circuit?

    <p>To prevent electrical shock</p> Signup and view all the answers

    What type of hazard can cause harm to the musculoskeletal system?

    <p>Ergonomic hazard</p> Signup and view all the answers

    What is an example of a task that can contribute to poor posture?

    <p>All of the above</p> Signup and view all the answers

    What is a common contributing factor to slip, trip, and fall hazards?

    <p>All of the above</p> Signup and view all the answers

    What defines a confined space?

    <p>An enclosed or partially enclosed space with limited openings</p> Signup and view all the answers

    What is an example of a hazard due to processes/environment?

    <p>All of the above</p> Signup and view all the answers

    What is a potential hazard in a confined space?

    <p>Flammable vapours or dusts</p> Signup and view all the answers

    What is a common hazard in the processing industry?

    <p>Confined space</p> Signup and view all the answers

    What can contribute to the accumulation of flammable or toxic vapours in a confined space?

    <p>Unfavourable natural ventilation</p> Signup and view all the answers

    What is a safety precaution to prevent electrical hazards?

    <p>Verifying the circuit before powering up</p> Signup and view all the answers

    What is one of the major contributors to electrical hazards?

    <p>Damaged tools and equipment</p> Signup and view all the answers

    What is the effect of a 10-24 mA electrical current on the human body?

    <p>Muscles can contract and cause one to 'freeze'</p> Signup and view all the answers

    What is an essential step in electrical safety protocols?

    <p>Checking power cords for signs of damage</p> Signup and view all the answers

    What is the minimum current required to cause ventricular fibrillation?

    <p>75 mA</p> Signup and view all the answers

    What is a sign of electrical shock when the current is above 300 mA?

    <p>Severe burns to skin, limbs, and internal organs</p> Signup and view all the answers

    What is a key principle of electrical safety?

    <p>Using only electrical instruments, appliances, and tools that are safety approved</p> Signup and view all the answers

    What is a major contributor to electrical hazards in the workplace?

    <p>Inadequate wiring and overloaded circuits</p> Signup and view all the answers

    What is the effect of a 1 mA electrical current on the human body?

    <p>Slight tingling sensation</p> Signup and view all the answers

    Study Notes

    Electrical Hazards

    • Major contributors of electrical hazards include:
      • Damaged tools and equipment with exposed electrical parts or worn-out cables
      • Inadequate wiring and overloaded circuits
      • Improper grounding
      • Operating electrical equipment in wet conditions
    • Effects of electrical current on the human body:
      • 1 mA: Slight tingling sensation
      • 2-9 mA: Small shock
      • 10-24 mA: Muscles can contract, causing freezing, and burns at the point of contact
      • 25-74 mA: Respiratory muscles paralyzed, burns at entry and exit points
      • 75-300 mA: Ventricular fibrillation, shock usually fatal
      • >300 mA: Death, with severe burns to skin, limbs, and internal organs
    • Electrical Safety measures:
      • Use only safety-approved electrical instruments, appliances, and tools
      • Check power cords for damage, rectify loose connections, and replace damaged ones
      • Never handle electrical equipment with damp or wet hands
      • Connect electrical circuits to the power supply last

    Mechanical Hazards

    • Basic checklist for machine safety:
      • Conduct risk assessment on handling equipment/machinery
      • Develop Safe Work Procedure (SWP) for operating the machine
      • Ensure appropriate personal protective equipment is worn
      • Ensure worker is adequately trained and competent in operating the machine
      • Ensure worker is familiar with the emergency response procedure
      • Ensure machine safety devices are functioning properly (e.g., machine guards, interlocking door)

    Ergonomic Hazards

    • A physical factor within the environment that harms the musculoskeletal system
    • Examples of ergonomic hazards include:
      • Improper manual handling
      • Lifting/lowering
      • Pushing/pulling
      • Twisting
      • Poor posture
      • Repetitive motion

    Hazards Due to Processes/Environment

    • Examples of hazards due to processes/environment include:
      • Slip, trip, and fall
      • Confined space
      • Work at height
      • Poor housekeeping
      • Inappropriate machine guarding
    • Slip, trip, and fall hazards:
      • Slip: Wet and slippery floors
      • Trip: Uncovered cables, protruding equipment parts, uneven steps
      • Other contributing factors: Poor lighting, poor housekeeping, no guardrails/handrails on staircases

    Confined Space

    • Definition: Any enclosed or partially enclosed space with limited openings, unfavourable natural ventilation, or containing potentially dangerous air contaminants
    • Characteristics of confined spaces:
      • Not intended for normal occupancy
      • Permits accumulation of flammable or toxic vapours or dusts or oxygen-deficient atmosphere
    • Examples of confined spaces in the processing industry:

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