Confined Space Training Certificate Confined Space Definition & Hazards

Question 1

What is the legal definition of a confined space under the Confined Spaces Regulations 1997?

Accepted Answer

Any place that is substantially enclosed and where there is a reasonably foreseeable specified risk

Answer

The Confined Spaces Regulations 1997 define a confined space as any place that is substantially enclosed and where there is a reasonably foreseeable specified risk of serious injury from hazardous substances or conditions.

Question 2

Which of the following is NOT listed as a specified risk under the Confined Spaces Regulations 1997?

Accepted Answer

Slipping on a wet floor

Answer

Slipping on a wet floor is a general workplace hazard, not a specified risk under the Confined Spaces Regulations 1997. Specified risks include oxygen deficiency, toxic atmosphere, drowning, fire/explosion, and loss of consciousness from heat.

Question 3

At what percentage of oxygen in the atmosphere is a confined space considered oxygen deficient?

Accepted Answer

Below 19.5%

Answer

An atmosphere is considered oxygen deficient when it contains less than 19.5% oxygen. Normal atmospheric oxygen is approximately 20.9%. Below 19.5% can cause impaired judgement; below 16% can be fatal.

Question 4

Which gas is heavier than air and can accumulate at the bottom of a confined space?

Accepted Answer

Carbon dioxide

Answer

Carbon dioxide (CO2) is heavier than air (density ratio approximately 1.52) and will sink and accumulate at the bottom of confined spaces such as pits, tanks, and cellars, displacing oxygen.

Question 5

What is engulfment in the context of confined space hazards?

Accepted Answer

Being submerged or buried by a free-flowing solid or liquid material

Answer

Engulfment is the submersion or burial of a person by a free-flowing solid (such as grain or sand) or liquid, which can cause suffocation or crush injuries. It is a specified risk under the Confined Spaces Regulations 1997.

Confined Space Practice Test

Confined Space Practice Test

Confined Space Training Certificate Confined Space Definition & Hazards