IPC-2222
10.1.1 Edge Spacing Except for edge-PB contacts, the minimum distance 
between conductive surfaces and the edge of
the finished PB, or a NPTH, shall not be less than the minimum spacing 
specified in Table 6-1 of IPC-2221 plus 0.4
mm. PBs that slide into guides shall have a minimum external conductor 
to guide distance of 1.25 mm or minimum
electrical clearance (see Table 6-1 of IPC-2221), whichever is greater. 
Special design applications in areas such as high
voltage, surface mount, and radio frequency (RF) technology may require 
variances to these requirements. Ground and
heat sink planes may extend to the edge when required by design.

Craig Sullivan wrote:
> I can't seem to find this information in any IPC document, unless I am
> obviously overlooking it.
> 
> We have a PCB customer designed with a trace close to the board edge
> (0.013"). However, when the board is scored for depaneling, the score width
> reduces the distance to around 0.005" - 0.007".
> 
> Can anyone recommend a reference or design guideline that specifies
> something like this? Something that may specify how close features can be
> placed to the board edge?
> 
> We have our own guidelines for DFA, and generally speaking, we've never run
> into anything this tight where it's become a cause for concern. But there's
> also a first time I suppose.
> 
> Thanks in advance for the input.
> Craig
> 
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