Oh, I forgot to mention that UL does not recognize soldermask as an
insulator, so the answer is that masking doesn't matter.

My regards,
Steve Smith
Project Engineer, C.I.D.
Staco Energy Products Co.
"Your tailored power solutions provider"


-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
TechNet wheels
Sent: Thursday, February 24, 2011 2:36 PM
To: [log in to unmask]
Subject: [DC] UL840

Can someone tell me how to interpret UL-840? Looking at table 9.1 and 
9.2. Which table applies for circuit boards traces? Does 9.2 apply to 
traces covered by mask and 9.1 apply to circuit board pad not covered 
by mask. It is very confusing! 

John W

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