For workers and supervisors (preposti) who enter tanks, reservoirs, pits, sewers and manholes: art. 66 and annex IV D.Lgs. 81/08, D.P.R. 177/2011. 13 questions, about 9 minutes. Translated from Italian: legal references remain the Italian ones (D.Lgs. 81/2008) Sources: D.Lgs. 81/2008 art. 66; D.P.R. 177/2011 · Reviewed 21/10/2026 · Training support, not a certification.
Which regulation governs the qualification of companies working in places suspected of pollution or in confined spaces?
D.M. 2/9/2021
D.P.R. 177/2011
D.M. 388/2003
Reg. EC 852/2004
Question 2 · Single choice · 30s · 1 pt
According to art. 66 of D.Lgs. 81/08, when is access to cesspits, sewers, tanks and similar allowed?
At any time, if the entrance is wide
Always, if the worker wears a surgical mask
Only at night, when the temperature is lower
Only after verifying that there is no danger or after making the atmosphere safe by ventilation or other suitable means
Question 3 · Single choice · 30s · 1 pt
What experience requirement does D.P.R. 177/2011 set for the company's workforce?
No experience requirement
At least 30% with at least three years of experience in places suspected of pollution or confined spaces
At least 10% with one year of experience
All workers with ten years of experience
Question 4 · Single choice · 30s · 1 pt
Who must necessarily have at least three years of experience in confined spaces?
Workers who perform the role of supervisor
Nobody in particular
Only the workers' safety representative (RLS)
Only the occupational physician (medico competente)
Question 5 · Single choice · 30s · 1 pt
In a contract for work in confined spaces, who does the client employer designate?
Their own representative, with adequate skills, who oversees with a guiding and coordinating role
A firefighter of their choice
Any employee, without requirements
Nobody: everything is up to the contractor
Question 6 · Single choice · 30s · 1 pt
What is the minimum duration of the client's briefing to the contractor's workers on the risks of the environment?
Half an hour
One week
At least one hour
At least one day
Question 7 · Single choice · 30s · 1 pt
Is subcontracting of work in confined spaces allowed?
Only if expressly authorised by the client and certified
Only if the subcontractor is based abroad
Never, in any case
Always, without conditions
Question 8 · Single choice · 30s · 1 pt
Why does a filter mask not protect in an oxygen-deficient environment?
Because the filters get wet
In fact it does protect, if the filter is new
Because the filter holds back contaminants but does not supply oxygen: an isolating respirator (self-contained breathing apparatus) is needed
Because the mask is too heavy
Question 9 · Single choice · 30s · 1 pt
Why is hydrogen sulphide (H2S) particularly insidious?
Because it is coloured and attracts attention
Because it is found only in laboratories
Because it is harmless but smells bad
Because at high concentrations it paralyses the sense of smell and the typical rotten-egg odour can no longer be smelled
Question 10 · Single choice · 30s · 1 pt
What percentage of oxygen is normally present in air?
About 5%
About 78%
About 21%
About 50%
Question 11 · Single choice · 30s · 1 pt
When must the atmosphere of a confined space be measured?
Only after the workers have left
Never, if the smell seems normal
Before entry and continuously for the whole time of occupation
Only the day before
Question 12 · True / False · 20s · 1 pt
During work in a confined space there must be a worker outside who keeps watch and can raise the alarm.
True
False
Question 13 · Multiple choice · 45s · 1 pt
Which of these are confined spaces or places suspected of pollution? (2 answers)
A ventilated open-plan office
An open-air courtyard
A cesspit or a sewer
A tank or a reservoir
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