General principles of control
103
Consultation and the arrangements for gathering
information from workers and their representatives are
particularly important if adaptation to the individual is
to be addressed as part of the principles of control to
prevent human error.
6.3
The hierarchy of risk control
measures
The principles of control outlined
above provide a basis
from which to consider the adequacy of existing control
measures, both those already in place and those that
are likely to be required. The principles themselves do
not provide a hierarchy from which to assist confi rma-
tion that the risks have been reduced so far as is reason-
ably practicable, neither do they
establish a hierarchy of
which control or series of controls to use.
The following is a summary of the preferred hierarchy
of risk control principles as outlined in the HSE publica-
tion HSG65 as they relate to general health and safety.
Eliminate risk
by substituting the dangerous for the
less dangerous, e.g.:
➤
Use less hazardous substances
➤
Substitute a type of
machine that has a better
guarding system to make the same product
➤
Avoid the use of certain processes entirely perhaps
by contracting out.
Combat risks
at source by engineering controls and
giving collective protective measures priority, e.g.:
➤
Separate the operator from the risk of exposure to a
hazardous substance by
fully enclosing the process
➤
Protect the dangerous parts of a machine by
guarding
➤
Design process machinery and work activities to
minimise the release, or to suppress or contain, air-
borne hazards (LEV)
➤
Design machinery to be operated remotely and to
which materials
are fed automatically, thus separat-
ing the operator from danger areas such as moving
blades, etc.
Minimise risk
by:
➤
Designing suitable systems of working
➤
Using personal protective clothing and equipment;
this should only be used as a last resort.
HSG65’s hierarchy refl ects that risk elimination and the
use of physical engineering
controls and safeguards to
control risk can be more reliably managed rather than
those that rely solely on people, particularly when they
are prone to error.
The hierarchy shown above relates to the manage-
ment of occupational safety and health issues,
the hier -
archy is very often extended slightly following a very
similar layout enabling the effective management of both
the primary and secondary fi re hazards to be considered.
The hierarchy is shown below:
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