Well, no one ventured a guess on how to read line 5 of a slash
sheet, so maybe I will try to ask the question a different way....

What good is it to list a certain amount of dielectric strength on a
slash sheet, if paragraph 6.3 of IPC-2221A specifies that we use
Table 6-1 for determining z-axis clearance?

For example, if I need to design for 260V, and Table 6-1 specifies
an 8mil (.2mm) laminate thickness, that's what I need to use,
right? So the fact that someone says a material strength is xx
kilovolts is a moot point once I have been constrained to 8mils
for 260V.

In my memory no one has ever discussed this subject on any IPC
listserver, which makes me wonder if I'm asking a valid question.
Am I mixing terms here?
Jack


On 11/14/07, Jack Olson <[log in to unmask]> wrote:
>
> Can someone please help me interpret slash sheets of IPC-4101?
>
> We are having some board problems, so I went to look up the voltage
> breakdown (line 5 in the laminate section)
> It lists 40kV for laminates over .5mm, thick, but nothing is listed in the
> column for laminates less than .5mm
> (Our design has .1mm laminate)
>
> What does that 40kV mean, and why is it only given for thicker laminates?
>

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