In message
<d9c1067d2cb544069485d5c3cdbf4...@bn1pr08mb059.namprd08.prod.outlook.com>
, dated Fri, 14 Mar 2014, "Nyffenegger, Dave"
<[email protected]> writes:
they don't seem to understand what a critical components list is. I've
given them examples and not gotten very far so I was looking for
something more official like from the standards.
Standards writers cannot tell what parts a designer might use and how
they might be used. A component could be critical in one circuit but not
in another. Bearing in mind what a 'critical component' is (one whose
failure, in any way, would compromise safety), one normally examines the
schematic and, for each part, considers 'What if...?'. This enquiry must
include whether further failures might occur as a consequence of one
part failing.
Of course, some components are always critical, some, but not all, of
those in mains supply circuits.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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