Sean,
        the standard answer from IPC for general purpose (Epoxy E-glass) FR4
(is there such a thing today?)is 39,400 Volts/mm (approx. 62,500V at
0.062"). This is derived from a test using 0.125mm and they warn that it
should not be considered linear for high voltage applications with minimal
dielectric spacing, i.e. less then 0.09mm (0.0035"). Don't think that counts
for most general designs, that would be 3.5mil laminate.

        Now a word of warning. This would be through the dielectric, not
around the edge of the material, through air, nor over the surface(s).
Considering most applications and the means for contamination of these
surfaces, I would be checking the surface or around the edge requirements as
well. Especially is there is copper near the board edges.

Sincerely,
Brad Velander.

Lead PCB Designer
Norsat International Inc.
Microwave Products
Tel   (604) 292-9089 (direct line)
Fax  (604) 292-9010
email: [EMAIL PROTECTED]
http://www.norsat.com

See us at Booth S8155 at NAB 2002 in Las Vegas April 8 - 11.


-----Original Message-----
From: Sean James [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 18, 2002 2:15 PM
To: Protel EDA Forum
Subject: [PEDA] Voltage standoff of FR4


What is the voltage standoff (front to back) for .062" FR4?

Sean James
PCB Designer
Telecast Fiber Systems
102 Grove Street
Worcester, MA 01603
TEL 508-754-4858 x33
FAX 413-541-6170

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