From: [email protected] (Cynthia Pleach)
To: [email protected]
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Organization: Digi International
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Date: Mon, 29 Jul 1996 10:42:25 -0500
Subject: Re: Safety
Also remind your boss about the cost for both engineering
and manufacturing two products versus one. If you
can meet many world standards with one product versus
multiple, the slight cost difference for the other transformer
is outweighed when considering the following:
1) FCC testing one version of the product, EN55022
testing the other version versus the cost of
one product test. etc for the rest of the testing
2) Documenting 2 products in your ECO system
versus one
3) DVT'ing 2 products not one
4) Purchasing 2 products
5) Writing 2 separate test plans
and on and on
Cynthia Pleach
Manager, Homologation
Digi International
treg @ world.std.com
07/29/96 11:20 AM
To: treg <treg @ world.std.com> @ SMTP
cc:
Subject: Re: Safety
On 7/29/96 Dave Spalding writes:
> I understand that =
>we can comply with either standard until March 2000 or 2001
As of April 1, 2000, new products will have to go the UL 1950 route. Products
already evaluated under the appropriate standard can still be ok as long as no
major changes have been made until April 1, 2005. After April 1, all products
will have to meet UL 1950.
One of the things that may determine your decision is the lifetime of your
product.
> because the PC would be tested to that (right?),
Yup...
>Also, the "fuse", he says, would be the etch on the board =
>because they would just peel off with the overvoltage testing of UL =
>1459. I am not comfortable with that, though.
I am not comfortable with that either because there is nothing to keep the
peeled off track from causing other problems, ie shorting out something. It is
also hard to rely on track working as a fuse because of manufacturing
tolerances. I am sure that whatever safety agency you choose will shake their
head side to side if you tell them about this idea.(At least the ones I know
about)
> the difference between UL 1459 and UL 1950
Overvoltage criteria is almost the same. Major difference is that UL 1459 used
Dielectric Strength testing as a method to insure adequate separation. UL 1950
does it both by Dielectrics and measurement of creepage & clearance.
"All opinions are my own, not necessarily those of my employer"
Eric Petitpierre
Pulsecom
Herndon, VA 20171
[email protected]
