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The graph for determining the
required performance level is
based on identifying the risk and
the resulting necessity for
reducing this to an acceptable
level.
Low risk results in PL = a (minimal
measures for risk reduction).
High risk results in PL = e
(comprehensive measures for
risk reduction).
Technically speaking, PL r
(required) is a “nominal value”,
which is the minimum that should
be achieved by the real structure.
Statements from EN 62061 are
also quoted here for a better
assessment of risks. The risk is
always evaluated in the same way,
that is as the severity of possible
damage and the probability that
damage will occur.
Application of 13849-1 Step 1: determining the required performance levels
P1
P2
P1
P2
P1
P2
P1
P2
F1
F2
F1
F2
S1
S2
a
b
c
d
e
Source: DIN EN ISO 13849-1 Appendix 1.2.3
Low risk
High risk
DIN EN ISO 13849-1
S Severity of injury
S1 Slight (normally reversible injury)
S2
Serious (normally irreversible injury,
or death)
Frequency and/or duration of exposure to hazard
F1
Seldom to less often and/or brief
F2 Frequent to continuous and/or long
P Possibility of avoiding the hazard
P1 Possible under specific conditions
P2 Scarcely ever possible
Statements from other standards
EN 62061
Irreversible injury (4 points)
(death, loss of eye or arm)
Irreversible injury (3 points)
(broken limb, loss of finger)
Reversible injury (2 points)
(requires further medical attention from a doctor)
Reversible injury (1 point)
Frequency (with a duration > 10 min)
< 1 h (5 points)
> 1 h to < 1 day (5 points*)
> 1 day < 2 weeks (4 points*)
> 2 weeks to < 1 year (3 points*)
> 1 year (2 points*)
* If exposure lasts less than 10 min, this can be reduced one level
Impossible (5 points)
Seldom (3 points)
Probable (1 point)