William,
This is a bit surprising from you but, it all depends on what you are targeting.
If you want to make life easier for you fabricating then you will need a minimum of whatever your positional tolerance for routing are.
If you are looking to minimizing your risk for leakage (i.e. High Speed, RF, etc.) you will need to add to the clearances. I stopped pulling back planes and just accepted the minor cost hit (quicker on the design time and not enough signal issues to warrant the added time to create keep outs).
In the more sensitive stuff, I like to keep 50 mils back and add ground guards when there is enough room.
So I guess this another of the it depends kinda answers, what are the criteria you need to meet and what trade-offs are acceptable.
I don't think there are real minimum requirements, but there may be good practices to follow for you specific needs.
Good luck,
FNK
Frank Kimmey CID+
Sent from my iPad
> On Jan 6, 2016, at 12:02 PM, Brooks, William <[log in to unmask]> wrote:
>
> What do you recommend for clearance from the edge of an internal plane to the board edge?
>
>
>
> William Brooks, CID+
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