Dave:

"EEC" is the manufacturer's logo which was chosen by the board fabricator when the
initial submission for U/L recognition was made.  It doesn't necessarily represent
anything, but in many cases it may be the initials of the manufacturer.  The "M"
reflects a portion of their U/L recognition: solder limits, minimum line width, maximum
operating temperature, approved laminate and mask materials, etc.  I'd hazard a guess
that you are dealing either with a multilayer board or with a company that has many
listings.

Sorry, I've never found a quick method for crossing the recognition marks to the
manufacturer's name.  Unless somebody else has a better suggestion, try looking in the
U/L Yellow Book under Printed Wiring (ZPMV2??) under board fabricators with names
starting with "E".

Don Vischulis
[log in to unmask]

Dave Hoover wrote:

> A customer asked me if I knew who "EEC-M"
> (UL Logo) is?
> I don't.........I'm sure someone here does.
> Can you help me?
>
> David Hoover
> Field Application Engineer

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