Health and Safety Trenches

What are the dangers associated with working in confined spaces?

• Lack of oxygen, being overcome by fumes, and flooding

• Inadequate lighting, poisonous fumes and gases, and fire

• Flooding, hot working conditions, and obstruction of escape route

• Inadequate ventilation, sudden entry of liquids or solids, and smoke inhalation

Which regulations govern working in confined spaces?

• Management of Health and Safety Regulations 1999

• Confined Spaces Regulations 1997

• Both A and B

• None of the above

What is the maximum depth of a trench that can be worked in without trench support?

• 0.5m

• 1.0m

• 1.2m

• 1.5m

What should be done to the trench if the depth exceeds the maximum limit without trench support?

• Bench the sides

• Batter the sides

• Support the sides with trench walling

• All of the above

How should trenches be made accessible?

• By placing ladders at regular intervals

• By using vehicle stops

• By erecting warning notices

• By positioning trench spoil away from the edge

What is the purpose of a trench support system?

• To prevent trench collapse

• To provide access and egress points

• To protect operatives from soil collapse

• All of the above

What is the main danger associated with propane gas in trench workings?

• It is heavier than air

• It causes flooding

• It leads to lack of oxygen

• It increases the risk of fire

What should employers do before workers enter a confined space?

• Conduct a risk assessment

• Provide adequate lighting

• Ensure proper ventilation

• Arrange for emergency rescue

What are the dangers of working in excavations?

• Collapse of excavation sides, materials falling, and flooding

• Damage to underground services, lack of oxygen, and fire

• Inadequate lighting, poisonous fumes, and sudden entry of liquids

• Obstruction of escape route, hot working conditions, and smoke inhalation

What should be done with the spoil from digging a trench?

• Position it at least 1m away from the edge of the trench

• Use it to support the trench walls

• Remove it from the worksite

• Place it near the access points