ECS Health Safety and Environmental Assessment 09
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Questions and Answers

Why may a confined space be dangerous to work in?

  • There may not be sufficient working space
  • Air in the space may be unbreathable due to poisonous gas
  • All of the hazards mentioned (correct)
  • Temperature and poor ventilation may affect the worker

What must be considered first when planning to carry out work in a confined space?

  • Has sufficient manpower been allocated
  • Has the job been priced properly
  • Have the correct tools been arranged
  • Can the work be done from the outside (correct)

When working in a confined space, such as a sewer, what danger may occur?

  • Boredom
  • Build-up of harmful gases (correct)
  • Getting wet through
  • Not enough time for the job to be done

To determine the safety of the atmosphere in an excavation, which of the following is essential?

<p>Using a gas detector (D)</p> Signup and view all the answers

Before entering an excavation to start work, it must first be:

<p>Inspected by a competent person (C)</p> Signup and view all the answers

What is the purpose of using a permit to work system?

<p>To help ensure safe system of work (A)</p> Signup and view all the answers

Why are young people more at risk on site?

<p>They are inexperienced and may not recognize danger (B)</p> Signup and view all the answers

You have to enter a manhole in which you know there are toxic gases. You have all the PPE but there is no appear to be a rescue plan in place what should you do?

<p>Do not enter the manhole until rescue plans and rescue equipment are in place (B)</p> Signup and view all the answers

You have to enter a manhole in which you believe there could be toxic gases. You have not been provided with any Respiratory Protective Equipment (RPE). What should you do?

<p>Tell your supervisor that you will need RPE, and if necessary, training in confined space working (A)</p> Signup and view all the answers

While digging a trench, you uncover a length of yellow marker tape at a depth of about 150mm. What does the presence of the marker tape mean?

<p>There is a buried electrical cable and further excavation must be carried out with care (C)</p> Signup and view all the answers

When exposing underground power cables, which method of excavation should you use?

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

A Cable Avoidance Tool (C.A.T.) and a Genny (generator) can be used successfully to locate underground cables by whom:

<p>A competent person after training (A)</p> Signup and view all the answers

When working alone:

<p>Make sure someone responsible knows where you are (B)</p> Signup and view all the answers

When do special precautions need to be taken when working near overhead electric power lines?

<p>Whenever work areas will be near or beneath the lines (B)</p> Signup and view all the answers

A mobile plant operator can let you ride in the machine:

<p>If it is designed to carry passengers (D)</p> Signup and view all the answers

You have to walk across a site several times a day, but have to dodge a lot of site traffic. The first thing you should do is:

<p>Tell your supervisor about the danger (B)</p> Signup and view all the answers

Flashcards

What makes a confined space dangerous?

A confined space is a workspace that is completely or partially enclosed, presenting dangers like limited entry/exit, poor ventilation, and potential for hazardous atmospheres.

What's the primary consideration before working in a confined space?

The first priority when planning work inside a confined space is to assess if the work can be done safely from outside, eliminating the risks associated with the confined environment.

What danger is common in a confined space like a sewer?

Harmful gases, often flammable and suffocating, can accumulate in confined spaces like sewers, posing a serious danger to workers.

How to determine the safety of an excavation's atmosphere?

A gas detector is crucial for assessing the safety of an atmosphere in an excavation, as many dangerous gases are colorless and odorless, posing a silent threat to workers.

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Who inspects an excavation before work?

A competent person must inspect any excavation before work begins, ensuring its stability and safety, particularly to prevent wall collapse and potential injury.

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What is the purpose of a permit to work system?

A permit to work system is a written procedure that establishes a safe system of work for hazardous tasks, ensuring all necessary precautions and safety measures are in place before work begins.

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Why are young people at higher risk on construction sites?

Young people are at greater risk on construction sites because of their lack of experience, making them more susceptible to hazards they may not recognize or understand.

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What's essential before entering a confined space with toxic gases?

A rescue plan must be in place before entering a confined space, especially one with toxic gases, to ensure prompt and effective assistance in case of emergency.

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What to do when RPE is not available for a confined space?

If respiratory protective equipment (RPE) is not available for entering a potentially toxic confined space, it's essential to inform your supervisor and request the necessary equipment and training.

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What does yellow marker tape in an excavation mean?

Yellow marker tape buried at a shallow depth indicates the presence of a buried electrical cable, necessitating caution during further excavation.

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Who can use a CAT and a Genny to locate cables?

A cable avoidance tool (CAT) and a generator (Genny) are used to detect underground cables but must only be operated by trained and competent individuals.

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What's the safest method for exposing underground power cables?

Hand digging is the preferred method for exposing underground power cables, as it provides greater control and reduces the risk of damage to the cables compared to mechanical excavation.

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When are special precautions necessary near overhead power lines?

Special precautions must be taken whenever working near overhead electric power lines, even without direct contact, as a close approach can lead to flashover and electric shock.

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What's crucial when working alone?

When working alone, it's crucial to inform a responsible person of your location regularly to ensure prompt assistance in case of an emergency or accident.

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What to do when pedestrian traffic is unsafe on a site?

If you encounter unsafe pedestrian traffic on a construction site, inform your supervisor about the hazards to allow for the implementation of safer working practices.

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When can a plant operator let someone ride in a machine?

Mobile plant operators should only allow passengers in their machines if the machine is specifically designed to carry passengers, ensuring safety for both the operator and passengers.

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Describe a confined space with a large opening.

A confined space with a large opening but a restricted exit pathway due to obstacles or tight passages, posing a challenge for quick escape.

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What's an unsafe atmosphere in a confined space?

The potential for an unsafe atmosphere within a confined space, due to the presence of hazardous gases which may accumulate and pose dangers to workers.

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What safety measures are needed for confined spaces?

Safety measures for working in confined spaces, such as proper ventilation, gas detection, and emergency rescue procedures.

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What's the danger of a high water-table in an excavation?

The potential for a sudden influx of water, due to high groundwater levels, creating dangerous conditions in an excavation.

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Identify the hazards of excavation work.

Excavation work, which involves digging trenches or pits, presents the risk of wall collapse and the need for safety measures.

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What's the danger of a hidden buried cable?

The potential for a hidden buried cable causing injury to workers if they are not aware of its presence or if they accidentally damage it.

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Describe high-risk areas for electrocution.

Areas where there is a significant risk of electrocution, such as those near overhead power lines, and require careful procedures.

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What are safe practices for working alone?

Safe working practices for working alone, such as informing a responsible person of your location and taking extra care while working unsupervised.

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What ensures safe pedestrian traffic on a site?

Safe pedestrian routes that separate pedestrians from vehicle traffic on a construction site, minimizing the risk of accidents and injuries.

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What's important for safety on a construction site?

The need for pre-planning, coordination, and communication on a construction site to prevent accidents and promote a safe work environment.

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What are the main dangers of working in a confined space?

The dangers of working in a confined space with limited access, poor ventilation, and potential for hazardous atmospheres, necessitating careful planning and safety measures.

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What is the role of competent supervision on a construction site?

The importance of competent supervision, with responsibilities for overseeing work practices, ensuring safety procedures are followed, and providing appropriate guidance.

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Study Notes

Confined Space Safety

  • Confined spaces are dangerous due to potential hazards like insufficient space, poisonous gases, temperature extremes, and poor ventilation. All these factors can pose risks to workers.
  • Planning confined space work must start with determining if the job can be done from outside the space. This will avoid the risks.
  • When working in confined spaces, like sewers, workers need to be aware of the risk of harmful gases building up.
  • Detecting atmospheric safety in excavations is crucial; using a gas detector is vital to determine if the atmosphere is safe.
  • Before entering an excavation, it must be inspected by a competent person to assess hazards, especially wall collapse.

Permit to Work Systems

  • Permit to Work systems are written procedures to control certain hazardous work types. They ensure work starts only after site procedures are clarified and understood.

Young Workers in Confined Spaces

  • Young workers may be at greater risk due to their inexperience and lack of practical experience. They might not recognize dangers as readily as experienced workers.

Entering Manholes with Toxic Gases

  • If there's a chance of toxic gases, enter the manhole with a plan in place, including a rescue plan and adequate rescue equipment readily available.
  • If respiratory protective equipment (RPE) isn't provided, immediately inform your supervisor.
  • Never enter a confined space without a rescue plan in place and the correct safety equipment.

Trench Excavation and Marker Tape

  • Yellow marker tape at a depth of approximately 150mm in a trench signals the presence of buried services (e.g., cables). Proper excavation procedures must be modified.

Cable Avoidance Tools

  • Cable Avoidance Tools (CATs) and generators (gennys) are used to locate buried services; usage is restricted to trained individuals. Always ensure the operator has received relevant training.

Excavation Methods and Power Cables

  • When uncovering power cables during excavation, proper methods involving a technique like hand-dug excavation or a 360-degree rubber-tyred excavator are recommended.

Overhead Electric Power Lines

  • Working near overhead electric power lines demands caution as contact (even close proximity) can lead to electric shock hazards. Work areas that could be near or beneath the power lines need special precautions.

Working Alone vs Teams

  • Working alone, especially in potentially hazardous scenarios, requires clear communication with a responsible person to know your location, particularly periodically.

Site Traffic

  • When navigating through sites with heavy traffic, prioritize safety by identifying pedestrian routes and keeping well away from vehicles; clear communication with site supervisors can help.

Mobile Plant Rides

  • Rides in mobile plant machinery should only be given when there is suitable safe seating provided. Rain or if the machine is not designed to carry passengers are reasons why it should not be utilized.

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