David - You should be able to get a ballpark figure from your PCB manufacturer (need to consider the properties of the materials you may be using in the PCB). You could also scan the various safety standards for values, but these are upper limits, and therefore conservative.
Regards, Mark Gill, P.E. EMC/Safety/NEBS Design Nortel Networks - RTP, NC, USA > -----Original Message----- > From: David Gelfand [SMTP:[email protected]] > Sent: Tuesday, May 23, 2000 11:33 AM > To: 'EMC-PSTC Internet Forum' > Subject: Breakdown voltage between pcb layers > > > Hello group, > > We have an emissions problem on a board and I would like to suggest a > ground > plane in the area of an RJ-45 jack (TNV-1). But we have always asked our > PCB > designers to leave TNV traces free of ground and power planes to avoid > arcing > during surge and dialectric strength tests. > > Does anyone know where to find specs on breakdown voltages between PCB > layers? > Has anyone successfully used ground planes above or below TNV traces? We > are > testing to UL1950 and Part 68. > > Any input would be much appreciated. > > Thank you, > > David. > > David Gelfand > Regulatory Approvals Group Leader > Memotec Communications Inc. > Montreal Canada > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > >
