If I remember correctly, the text in 60335 was prompted by an incident
in Denmark where a toaster incorrectly switched on due to EMI. Since the
work was done under pressure, it might not have been done in the most
appropriate way, but the end-result is as intended.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-03-21 11:07, Gert Gremmen; ce-test wrote:
The EMC tests as called out in 60335 are safety tests, contrary to
those called out under the EMCD that are functional tests only. For
Europe , one can discuss about the necessity of those tests, as the
EMCD requires testing in all operating modes including OFF or standby
and as long as one can prove that an apparatus remains functional,
it also could be considered safe. I have not seen many examples of a
compliant functional apparatus that has become unsafe during an
immunity test, but cannot exclude that this may happen either. Hence
this test in 60335, that might also come into view during the required
risk analysis as called out in the new LVD. For Europe only, of course.
The difference between functional and safety related EMC is an
evolving discussion, lately triggered by accidents with hybrid and
autonomous driving cars.
Gert Gremmen
On 20-3-2018 10:27, James Pawson (U3C) wrote:
Hello experts,
I note that EN 60335-1 (household and similar appliances)
specifically calls up EMC immunity tests in clause 19.11.4 where the
controls for the EUT are set in the “off position” and a set of
immunity tests are applied. For something that controls a heating
element, I can see why this would be a concern.
A couple of questions / thoughts:
* It sounds like this at least doubles the amount of immunity
testing required – one with the EUT “on” and one with it “off”.
Would that be how you read this?
* Are there any other safety standards that explicitly call up EMC
tests within them like this one does? This is the first one I’ve
come across where this is the case but I’m not very familiar with
safety standards in general.
Thanks and all the best,
James
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