Joey,

By default, no UL marking is not required.  For instance military
product do not have UL markings and prototypes sometimes don't.  If the
board is required to have UL markings it will usually be specified on
the procurement documentation.  Then it will specify if the recognition
required is flammability only (V-0) or full recognition. 

If UL markings are required it would have to be identified by the
Manufacturer UL logo and the type designation.  The type designations
are listed on the UL Card with the parameters that the board has been
tested and recognized with. If the board is too small or does not have
adequate space (2.5 mm high) for the UL mark then the mark shall be
place on the smallest unit container (UL 796 Section 31).

I hope this answers your question.

Russ Shepherd
Director PCB\PWB Test Programs
UL PWB Test Programs
Microtek Laboratories
1435 Allec Street
Anaheim, CA 92805
(714) 999-1616
www.thetestlab.com


-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Jose A
Rios
Sent: Tuesday, November 03, 2009 4:29 PM
To: [log in to unmask]
Subject: [IPC-600-6012] UL marking on pwb's

is UL code marking a requirement on all pwb's by default?? 
or only when procurement documentation requires it ??

Joey Rios
PWB & Process Quality Eng'r
Endicott Interconnect Technologies
1093 Clark St.
Endicott, NY 13760
Office: 607-755-5896

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