Introduction to Health and Safety at Work

Breathing apparatus
Any incident in which breathing apparatus malfunc-
tions while in use, or during testing immediately 
prior to use.
10. 
Diving operations
In relation to a diving project the failure or the 
endangering of diving equipment, the trapping of 
a diver, any explosion in the vicinity of a diver, any 
uncontrolled ascent or any omitted decompression.
11. 
Collapse of scaffolding
The complete or partial collapse of any scaffold 
which is more than 5 m in height; erected over or 
adjacent to water, in circumstances such that there 
would be a risk of drowning to a person falling 
from the scaffold into the water; or the suspension 
arrangements of any slung or suspended scaffold 
which causes a working platform or cradle to fall.
12. 
Train collisions
Any unintended collision of a train with any other 
train or vehicle.
13. 
Wells
Any dangerous occurrence at a well other than a 
well sunk for the purpose of the abstraction of water.
14. 
Pipelines or pipeline works
A dangerous occurrence in respect of a pipeline or 
pipeline works.
15. 
Fairground equipment
The failure of any load-bearing part or the derail-
ment or the unintended collision of cars or trains.
16. 
Carriage of dangerous substances by road
Any incident involving a road tanker or tank con-
tainer used for the carriage of dangerous goods in 
which the tanker overturns, is seriously damaged, 
there is an uncontrolled release or there is a fi re.
Dangerous occurrences which are reportable except 
in relation to offshore workplaces
17. 
Collapse of building or structure
Any unintended collapse or partial collapse of any 
building or structure: under construction; recon-
struction; alteration or demolition which involves a 
fall of more than 5 tonnes of material; any fl oor or 
wall of any building; or any false-work.
18.