[PCB_FORUM] Z-axis voltage spacing

From: Mark Salberg <msalberg@xxxxxxxxxxxx>
To: Cadence User Group <icu-pcb-forum@xxxxxxxxxxxxx>
Date: Tue, 19 Sep 2006 10:26:48 -0400

Hello group, Can anybody steer me to an IPC and/or UL spec that references a Z-AXIS "volts per mil" distance through FR4 dielectric. We have a 1200 V board and am "hearing" very different numbers. 50v / mil, 100v / mil and 750v / mil.

Also, is the IPC Voltage spacing table for internal conductors the save a Z-axis?

50v per mil thru an IPC "technet" as a "rule of thumb. 100v / mil from E.E's and other designers. 750v / mil from our UL safety guy. This was for a 1200V Cat II which has 6000v trannsients. Calculating to 750v / mil INCLUDING transients...6000V divided by 750 = 8 mil.

Who is right?
Where can I reference or verify this?

Thank you in advance,
Mark


_____________________________________________________________________________
Scanned by IBM Email Security Management Services powered by MessageLabs. For 
more information please visit http://www.ers.ibm.com
_____________________________________________________________________________

Follow-Ups:

[PCB_FORUM] IDF import to PROE
From: Eileen Ong

[PCB_FORUM] Z-axis voltage spacing

Other related posts: