Hello All,

I received some transformer samples for a modem front end circuit that
are supposed to have been designed to UL1950 and IEC950 creepage
dimensions.  It appears that the spacings would be correct if the core
material was not considered. I believe this to be an oversight made by
the transformer designer.  

Is the ferrite core considered a conductive material? If so, do the
primary-secondary distances apply to each winding and the core material?

Thanks in advance, 

Rich Kalian
Aware, Inc. 
[email protected]

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