Check IPC-D-275 Table 3-1 for electrical spacing requirements. There's a 
formula, but it depends on whether the trace is internal or external, 
what the altitude the product will be used in is, and what the coating is.

IPC-D-275, Design Requirements for Printed Circuit Boards and Printed 
Circuit Board Assemblies, is available from IPC's order dept: $30 
members/ $60 nonmembers.

Mike Buetow
IPC Technical Staff
2215 Sanders Road
Northbrook, IL 60062
P: 847-509-9700, ext. 335
F: 847-509-9798
[log in to unmask]


On Wed, 7 Aug 1996, R.D. Munger wrote:

> Does the IPC have any publications/charts regarding the minimum copper
> clearance spacing for various voltages? We have a 1500VAC copper trace and
> would like to know the minimum gap required from an ajoining copper land.
> 
> 
> Thank you.
> 
> Dan Munger
> Fermilab
> Batavia, IL USA
> [log in to unmask]
> 
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