Doug,
In researching the book that I am writing for Kluwer, Robust Electronic
Design Reference, I ran across the following booklet:
Lund, Preben, How to Design Printed Circuit Boards for UL
Recognition. Westlake Village, CA: Bishop Graphics, 1983.
In my manuscript, I discuss UL Recognition of PCB's on pages G-15 and
G-16. Basically, a UL Recognition Card ("Yellow Card") issued by UL to
a printed circuit board (PCB) vendor covers:
* The laminate, conductor, soldermask, surface finish, and legend
materials to be used, and acceptable alternatives.
* The vendor's manufacturing process.
* The design rules to be followed, including:
- Minimum trace width for "Midboard Conductors".
- Minimum trace width for "Edge Conductors".
- Minimum annular ring on vias and plated-through holes.
- Maximum Unpierced Area.
- Maximum operating temperature.
- Minimum thicknesses for base laminate, C-stage laminates, B-stage
laminates, and finished PCB's.
- Conductor thickness.
If you would like a deeper understanding of what a "94V-0" rating
represents, I suggest you read
Grand, Arthur F., and Wilkie, Charles A., Fire Retardancy of
Polymeric Materials. New York: Marcel Dekker, 2000.
John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE
dBi Corporation
http://www.dbicorporation.com/
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Ron Pickard: emc-p...@hypercom.com
Dave Heald: emc_p...@symbol.com
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
Jim Bacher: j.bac...@ieee.org
Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
