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© ABB Group
November 3, 2016 | Slide 7
Who shall conduct the FSAs?
Level of Independence
IEC 61508
The minimum level of
independence of those
carrying out a functional
safety assessment shall be
as specified
IEC 61511
The membership of the
assessment team shall
include
at least one senior
competent person
not
involved in the project
design team [i.e.
independent] or not
involved in the operation &
maintenance of the SIS
Source: IEC 61508 Ed 2 - 2010
X – Sufficient Independence
Y – Insufficient Independence