Hi,

I discovered a while back in a design that it is possible for a line
with clearance to cut away connectivity of a thermal.

This certainly wasn't the expected behaviour. I know you might argue
that combining themals and tracks to connect a pin is a bad idea, but I
usually route tracks first, then add planes and join them. Sometimes you
miss deleting / changing the join flag on some tracks.

IIRC, the connectivity check didn't notice the break.

The other reason I sometimes do this deliberately, is if the thermal
happens to be at the point where I want a kelvin connection to the
ground plane. The track could be leading off to some sensing circuit.


-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)

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