The quote below is from the Eagle help file. I typically use polygons for ground plane pours and I'm pretty sure I've increased the isolate value to be larger than the clearances in the design rules and have not had problems. But evidently I don't know "exactly what I am doing" because I'm not quite…

Eagle polygon isolate parameter

MarkT October 2, 2012, 10:49pm 4

We need an airwire-thickness parameter (and possibly colour too)!

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