Kitty Hines just posted the following. I sent her a reply, but I think it
went directly to her mail, not over the designercouncil. So I am posting it
to the council for info. If this turns out to be a dual post, I apologize!!


At 10:16 PM 4/8/96, you wrote:
>I am looking for information on the spacing requirements necessary 
>to meet UL approval.  Can anyone give me a reference on where to 
>find these specs?
>
>Thanx for your help.


Two years ago I had the same problem. I talked with a very helpful guy named
Michael Cusanelli at UL Labs in Santa Clara. He was at 408-985-2400 ext 2997
--- don't have a clue if he still is.

The relevant spec is UL 1950 (US) or IEC 950 (Common Market), parts of which
are still voluntary until the year 2000.

If the working voltage is under 50 v (dc) or 71 v P-P, there is no spec
(Section 2.9.4) If the working voltage exceeds that, then there are specs
for separation, but not on trace thickness or width. There are two tables in
Section 2.9.5 that apply --- Table 7 IF the traces are conformally coated,
Table 5 if they are not.

When I called them asking for this information, they faxed me the relevant
pages. Probably would do the same for you if you called them.

Doug Brooks, President
UltraCAD Design, Inc.