Pete,
I usually the vendor logo and/or E# to establish vendor name/plant of
manufacturer using the suggested site.
Victor,
-----Original Message-----
From: Dale Ritzen [mailto:[log in to unmask]]
Sent: Wednesday, March 11, 2009 7:56 AM
To: TechNet E-Mail Forum; Hernandez, Victor G
Subject: RE: [TN] UL Logos
The "E" number is the UL file number that is assigned to a manufacturer.
The file contains all the "Recognized" or "Listed" components from that
manufacturer that have been tested by UL and found to comply with
whatever standard is used to qualify components under in a specific
"category". A "Category" is a specific range of products (Example:
category "ZPMV2" is for printed circuit board manufacturers). There are
numerous categories and subcategories (I have a 1/2" thick book of the
category listings) that apply to various types of components.
Example: You can find which company built your PCBs by looking at the E
file number on the PCBs you buy (if they put the E file number on them),
then going to the UL on-line certification search function, typing in
the "E" file number and submitting the request.
There used to be (I believe you can still get) a set of "Yellow Books"
(hardcopy) of all the recognized component categories and the
manufacturers and recognized products under each category. Yes, they
were huge - and I'm sure they haven't shrunk in size since I had copies
about 10 years ago. The on-line cert directory is the best way to go
now.
Each manufacturer who has a recognized product must have some
identifying logo also on the product or on the packaging for the
product. Unfortunately, there is no way to scan in a logo and do a
search on it at this time. That's why we always specify that any PCB we
buy MUST have an E file number on it somewhere. These days you may buy
boards from a board broker, so you don't have a clue which shop built
them. The E file nails that down nicely...
Dale Ritzen, CQA
Quality Manager/ISO Management Representative
Austin Manufacturing Services
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Wednesday, March 11, 2009 7:42 AM
To: [log in to unmask]
Subject: Re: [TN] UL Logos
What is the E #?
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pete Houwen
Sent: Friday, March 06, 2009 8:33 AM
To: [log in to unmask]
Subject: Re: [TN] UL Logos
I just spent hours poring over their trademark pages, trying to idetify
a logo with no "E" number. I tried narrowing it down by the apparent S
and Z in the logo - down to the few hundred Shenzhen shops....what fun!
We have a production line in Germany stopped by a UL inspector right
now, because this anonymous Chinese board shop didn't use a proper UL
logo, and no one seems to know where the boards came from. Maybe they
just "copied"
the logo wrong?
Pete
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