Thanks, Gert, but I don't think that's enough to satisfy the legal
people. The rationale does not say what 'significant' means, and the
meaning can't be determined from the rationale text. the best solution,
I think, is to delete 'significant' from 6.4.8.2.3, as it adds nothing
to meaning but a lot to confusion. It's then consistent with the rationale.
On 2024-07-01 11:35, Gert Gremmen F4LDP wrote:
TR 62368-2:2019:
Part 2: Explanatory information related to IEC 62368-1:2018
6.4.8.2.3 Compliance criteria
Rationale:
In each case there is a performance test, and construction (pre-selection)
criteria given. For material flammability, compliance of the material is
checked at the minimum thickness used as a fire enclosure or fire
barrier.
Gert Gremmen
On 1-7-2024 11:02, James Pawson (U3C) wrote:
Hello again,
IEC 62368-1
/6.4.8 Fire Enclosures/
/6.4.8.2.3 Compliance criteria/
/Compliance is checked by inspection of applicable data sheets or test.
The material flammability class is checked for the *thinnest
significant thickness* used./
There’s not a definition of “significant thickness” in the standard.
Given that openings in a fire enclosure have controlled maximum
dimensions I’m going to read “significant thickness” as “thickness of
an area of material that is larger than the maximum permitted opening
in that face of the fire enclosure”
Thoughts welcomed!
All the best
James
James Pawson
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