# Re: [PEDA] Power plane questions

```Matt,

I expect that the arc on the outside is OK. 25 mils is enough clearance. I
assume that you are actually splitting the planes, not just drawing traces
to separate regions. You have to choose a net for the plane, and then add
split plane regions for the other nets. The region boundary is a
continuous, closed boundary. Your outside arc can be on top of the arcs for
the region boundary. I haven't used an arc for this, so you may have to
approximate it with short segments. Do the same for the outside 'arc' so
they overlie each other.
Split planes can be confusing. I ALWAYS (well, once I didn't, and that was
expensive!) check the gerber plots. Remember that the planes are negative,
so anything on the gerbers is etched away. Direct connections (vias or pads
without a relief connection) won't appear on the gerbers, but the relief
connections will.```
```
Richard

At 03:02 PM 5/19/2002 -0700, you wrote:

>1. I placed an arc on the plane (my board is circular)
>to form a circle all the way around the edge of the
>board.  The idea is to keep the plane away from the
>edge of the board.  The assigned net for the arc is
>"No Net".  Is this the correct procedure for keeping
>the plane away from the edge of the board?
>
>2. The arc is 50 mils wide.  Since I placed the arc
>directly on top of the board outline, I expect to get
>25 mils of clearance from the board edge to the plane.
>  In general, is that enough clearance?
>
>3. I have split the plane into multiple nets.  The
>tracks that indicate the boundaries are 45 degree and
>90 degree tracks.  Recall I have an arc on my board
>edge.  Because the 45/90 tracks and the arc are not
>"compatible", the tracks extend outside of the arc to
>avoid tiny slivers of plane near the board edge.  Is
>there a better way to do this?  For example, can I
>define the regions with mostly 45/90 tracks but add an
>arc at the board edge to complete the region?  Will
>the way I have done this likely confuse the board
>house?
>
>I'm using Protel 99 SE sp6.
>
>Thank you,
>Matt
>
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