[SI-LIST] PCB High Voltage

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Hi Folks,
 
 
Its regarding the query posted by srikanth for high voltagesometime last
week,what is the actual voltage for 1.6 mm of fr4 can withstand?And what one
need to look for from the fabricator,
 
As i had replied earlier as below
 
According to MIL-P-13949/4C for FR4 material,the electric strength
(perpendicular to lamination,average,minimun volts/mil=750v per
mil which is 29.25 mm.,which i have red it in some article while
browsing.Now because of  mixed response in the forum,what will be the final
conclusion for the same.
 
Can someone refer some links related to this?.Advance thanx.
 
 
-Ramesh
 
 
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