Dear all,
In bringing a product through safety and having many
issues, it might surprise you that after all was said and
done, the entire safety approval reduced to a simple
cfm rating fan for a chip both on the secondary
side of the power supply.
For some obvious reasons of which I hope you all
understand, I can't provide too many details either
here or off-line.
Needless to say, the fan and chip companies have
non-disclosure agreements them. In trying to obtain
a simple cfm rating of the fan, a flurry of "call the
other guy" began to happen.
Nothing was resolved. Indeed, I went so far as
to offer signing ANY type of non-disclosure
agreements with both of them. But that was to
no avail. And it remains so.
So, the ECO gets cut to remove that part and
mfr, plus any other parts by said mfr. An email
gets sent to said fan company stating the resultant
actions, etc, etc ... I doubt it will be of any
concern to them.
My reason for posting is that in the 20 or so
years of doing EMC/Safety, I've never run
into such a thing. Neither have I heard such
a thing from associates who have been doing
this work for as long or longer than I.
This isn't an invitation to a bitch session about the
companies. Nor is it a complaint about the NRTLs
who are just doing their job. My experience in said
matter with the NRTL has been great.
I've run into something similar with patents and ink
believe it or not. Mfr.'s are not really obligated to
spell out exactly everything in something such as
a patent, which I found surprising.
What surprises me here is in the case of safety,
where information is not disclosed. The NRTL
didn't do cfm rating of the fan. In fact, there's
really little no standard way to do cfm of fans.
Thus, the reason why they allow similar fans
within a mfr but not from another mfr. in
some cases.
So, I'm wondering some of the following:
1. Have any you ever run into something
like this before?
2. If you have, what did you do about it?
On and off line responses both welcome ...
Regards, Doug McKean
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