In message
<d0260b4f9aff41a5b0341a5da9c97...@bn1pr08mb059.namprd08.prod.outlook.com>
, dated Sat, 22 Feb 2014, "Nyffenegger, Dave"
<[email protected]> writes:
'm looking for some more recent definitions/guidelines/criteria for
determining what constitutes critical components for the critical
component lists in the product technical construction files, in
particular the files to be maintained as part of CE compliance. I am
not un-familiar with the topic but would like to see what's out there.
There are some very old threads regarding this topic in the forum
archives so I'm thinking there may be more recent material on this
somewhere.
I'm primarily looking for the safety related components.
Guidelines can only be so general that they probably don't help you at
your stage. Instead you need to develop further the skill of detecting
safety-critical parts in each product. Look at each part and think 'How
can it fail? What if it does (for each way it can fail)?
Not only electronic components but mechanical things, especially covers
and insulation). Bear in mind that covers and insulation might be
omitted in production or when reassembling after repair.
Another topic is 'What if that part was substituted by another?' This
was a favourite in past designs of consumer product that had a cover
secured by four screws. Put a longer one in the front right-hand
location and it would impact and break the mains switch, possibly
contacting live mains wiring and connecting it to the (Class II, not
earthed) metal case.
--
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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