Is there an IPC callout for exposed edge copper?

I seem to remember it not being allowed, but cannot locate an actual statement 
in any of the IPC documentation.

What I am referring to is when you have a negative copper plane (or copper pour) 
on an internal layer that extends to the edge of the PCB. When it gets 
fabricated, there would be a small line of internal copper for each of the 
planes that extend to the edge of the PCB - which could be shorted together, if 
a metal object were brought into contact with the exposed copper.

Any thoughts?

Regards,

James Jackson
Oztronics 


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