Podcast
Questions and Answers
What is a primary purpose of interlocking doors in machine safety?
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?
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?
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?
What is a common effect of electrical shock?
What is a necessary component of machine safety protocols?
What is a necessary component of machine safety protocols?
What is a benefit of conducting a risk assessment on handling equipment/machinery?
What is a benefit of conducting a risk assessment on handling equipment/machinery?
What is a critical component of electrical safety protocols?
What is a critical component of electrical safety protocols?
What is a potential source of ignition in a flammable atmosphere?
What is a potential source of ignition in a flammable atmosphere?
What is the purpose of ensuring everything is okay before powering up a circuit?
What is the purpose of ensuring everything is okay before powering up a circuit?
What type of hazard can cause harm to the musculoskeletal system?
What type of hazard can cause harm to the musculoskeletal system?
What is an example of a task that can contribute to poor posture?
What is an example of a task that can contribute to poor posture?
What is a common contributing factor to slip, trip, and fall hazards?
What is a common contributing factor to slip, trip, and fall hazards?
What defines a confined space?
What defines a confined space?
What is an example of a hazard due to processes/environment?
What is an example of a hazard due to processes/environment?
What is a potential hazard in a confined space?
What is a potential hazard in a confined space?
What is a common hazard in the processing industry?
What is a common hazard in the processing industry?
What can contribute to the accumulation of flammable or toxic vapours in a confined space?
What can contribute to the accumulation of flammable or toxic vapours in a confined space?
What is a safety precaution to prevent electrical hazards?
What is a safety precaution to prevent electrical hazards?
What is one of the major contributors to electrical hazards?
What is one of the major contributors to electrical hazards?
What is the effect of a 10-24 mA electrical current on the human body?
What is the effect of a 10-24 mA electrical current on the human body?
What is an essential step in electrical safety protocols?
What is an essential step in electrical safety protocols?
What is the minimum current required to cause ventricular fibrillation?
What is the minimum current required to cause ventricular fibrillation?
What is a sign of electrical shock when the current is above 300 mA?
What is a sign of electrical shock when the current is above 300 mA?
What is a key principle of electrical safety?
What is a key principle of electrical safety?
What is a major contributor to electrical hazards in the workplace?
What is a major contributor to electrical hazards in the workplace?
What is the effect of a 1 mA electrical current on the human body?
What is the effect of a 1 mA electrical current on the human body?
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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